1 /* TODOLIST 2 3 Solvers 4 - Add support for cholesky for coarse solver (similar to local solvers) 5 - Propagate ksp prefixes for solvers to mat objects? 6 7 User interface 8 - ** DM attached to pc? 9 10 Debugging output 11 - * Better management of verbosity levels of debugging output 12 13 Extra 14 - *** Is it possible to work with PCBDDCGraph on boundary indices only (less memory consumed)? 15 - BDDC with MG framework? 16 17 MATIS related operations contained in BDDC code 18 - Provide general case for subassembling 19 20 */ 21 22 #include <../src/ksp/pc/impls/bddc/bddc.h> /*I "petscpc.h" I*/ /* includes for fortran wrappers */ 23 #include <../src/ksp/pc/impls/bddc/bddcprivate.h> 24 #include <petscblaslapack.h> 25 26 static PetscBool PCBDDCPackageInitialized = PETSC_FALSE; 27 28 static PetscBool cited = PETSC_FALSE; 29 static const char citation[] = 30 "@article{ZampiniPCBDDC,\n" 31 "author = {Stefano Zampini},\n" 32 "title = {{PCBDDC}: A Class of Robust Dual-Primal Methods in {PETS}c},\n" 33 "journal = {SIAM Journal on Scientific Computing},\n" 34 "volume = {38},\n" 35 "number = {5},\n" 36 "pages = {S282-S306},\n" 37 "year = {2016},\n" 38 "doi = {10.1137/15M1025785},\n" 39 "URL = {http://dx.doi.org/10.1137/15M1025785},\n" 40 "eprint = {http://dx.doi.org/10.1137/15M1025785}\n" 41 "}\n"; 42 43 PetscLogEvent PC_BDDC_Topology[PETSC_PCBDDC_MAXLEVELS]; 44 PetscLogEvent PC_BDDC_LocalSolvers[PETSC_PCBDDC_MAXLEVELS]; 45 PetscLogEvent PC_BDDC_LocalWork[PETSC_PCBDDC_MAXLEVELS]; 46 PetscLogEvent PC_BDDC_CorrectionSetUp[PETSC_PCBDDC_MAXLEVELS]; 47 PetscLogEvent PC_BDDC_CoarseSetUp[PETSC_PCBDDC_MAXLEVELS]; 48 PetscLogEvent PC_BDDC_CoarseSolver[PETSC_PCBDDC_MAXLEVELS]; 49 PetscLogEvent PC_BDDC_AdaptiveSetUp[PETSC_PCBDDC_MAXLEVELS]; 50 PetscLogEvent PC_BDDC_Scaling[PETSC_PCBDDC_MAXLEVELS]; 51 PetscLogEvent PC_BDDC_Schurs[PETSC_PCBDDC_MAXLEVELS]; 52 53 PetscErrorCode PCApply_BDDC(PC,Vec,Vec); 54 55 PetscErrorCode PCSetFromOptions_BDDC(PetscOptionItems *PetscOptionsObject,PC pc) 56 { 57 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 58 PetscInt nt,i; 59 PetscErrorCode ierr; 60 61 PetscFunctionBegin; 62 ierr = PetscOptionsHead(PetscOptionsObject,"BDDC options");CHKERRQ(ierr); 63 /* Verbose debugging */ 64 ierr = PetscOptionsInt("-pc_bddc_check_level","Verbose output for PCBDDC (intended for debug)","none",pcbddc->dbg_flag,&pcbddc->dbg_flag,NULL);CHKERRQ(ierr); 65 /* Approximate solvers */ 66 ierr = PetscOptionsBool("-pc_bddc_dirichlet_approximate","Inform PCBDDC that we are using approximate Dirichlet solvers","none",pcbddc->NullSpace_corr[0],&pcbddc->NullSpace_corr[0],NULL);CHKERRQ(ierr); 67 ierr = PetscOptionsBool("-pc_bddc_dirichlet_approximate_scale","Inform PCBDDC that we need to scale the Dirichlet solve","none",pcbddc->NullSpace_corr[1],&pcbddc->NullSpace_corr[1],NULL);CHKERRQ(ierr); 68 ierr = PetscOptionsBool("-pc_bddc_neumann_approximate","Inform PCBDDC that we are using approximate Neumann solvers","none",pcbddc->NullSpace_corr[2],&pcbddc->NullSpace_corr[2],NULL);CHKERRQ(ierr); 69 ierr = PetscOptionsBool("-pc_bddc_neumann_approximate_scale","Inform PCBDDC that we need to scale the Neumann solve","none",pcbddc->NullSpace_corr[3],&pcbddc->NullSpace_corr[3],NULL);CHKERRQ(ierr); 70 /* Primal space customization */ 71 ierr = PetscOptionsBool("-pc_bddc_use_local_mat_graph","Use or not adjacency graph of local mat for interface analysis","none",pcbddc->use_local_adj,&pcbddc->use_local_adj,NULL);CHKERRQ(ierr); 72 ierr = PetscOptionsInt("-pc_bddc_graph_maxcount","Maximum number of shared subdomains for a connected component","none",pcbddc->graphmaxcount,&pcbddc->graphmaxcount,NULL);CHKERRQ(ierr); 73 ierr = PetscOptionsBool("-pc_bddc_corner_selection","Activates face-based corner selection","none",pcbddc->corner_selection,&pcbddc->corner_selection,NULL);CHKERRQ(ierr); 74 ierr = PetscOptionsBool("-pc_bddc_use_vertices","Use or not corner dofs in coarse space","none",pcbddc->use_vertices,&pcbddc->use_vertices,NULL);CHKERRQ(ierr); 75 ierr = PetscOptionsBool("-pc_bddc_use_edges","Use or not edge constraints in coarse space","none",pcbddc->use_edges,&pcbddc->use_edges,NULL);CHKERRQ(ierr); 76 ierr = PetscOptionsBool("-pc_bddc_use_faces","Use or not face constraints in coarse space","none",pcbddc->use_faces,&pcbddc->use_faces,NULL);CHKERRQ(ierr); 77 ierr = PetscOptionsInt("-pc_bddc_vertex_size","Connected components smaller or equal to vertex size will be considered as primal vertices","none",pcbddc->vertex_size,&pcbddc->vertex_size,NULL);CHKERRQ(ierr); 78 ierr = PetscOptionsBool("-pc_bddc_use_true_nnsp","Use near null space attached to the matrix without modifications","none",pcbddc->use_nnsp_true,&pcbddc->use_nnsp_true,NULL);CHKERRQ(ierr); 79 ierr = PetscOptionsBool("-pc_bddc_use_qr_single","Use QR factorization for single constraints on cc (QR is always used when multiple constraints are present)","none",pcbddc->use_qr_single,&pcbddc->use_qr_single,NULL);CHKERRQ(ierr); 80 /* Change of basis */ 81 ierr = PetscOptionsBool("-pc_bddc_use_change_of_basis","Use or not internal change of basis on local edge nodes","none",pcbddc->use_change_of_basis,&pcbddc->use_change_of_basis,NULL);CHKERRQ(ierr); 82 ierr = PetscOptionsBool("-pc_bddc_use_change_on_faces","Use or not internal change of basis on local face nodes","none",pcbddc->use_change_on_faces,&pcbddc->use_change_on_faces,NULL);CHKERRQ(ierr); 83 if (!pcbddc->use_change_of_basis) { 84 pcbddc->use_change_on_faces = PETSC_FALSE; 85 } 86 /* Switch between M_2 (default) and M_3 preconditioners (as defined by C. Dohrmann in the ref. article) */ 87 ierr = PetscOptionsBool("-pc_bddc_switch_static","Switch on static condensation ops around the interface preconditioner","none",pcbddc->switch_static,&pcbddc->switch_static,NULL);CHKERRQ(ierr); 88 ierr = PetscOptionsInt("-pc_bddc_coarse_eqs_per_proc","Target number of equations per process for coarse problem redistribution (significant only at the coarsest level)","none",pcbddc->coarse_eqs_per_proc,&pcbddc->coarse_eqs_per_proc,NULL);CHKERRQ(ierr); 89 i = pcbddc->coarsening_ratio; 90 ierr = PetscOptionsInt("-pc_bddc_coarsening_ratio","Set coarsening ratio used in multilevel coarsening","PCBDDCSetCoarseningRatio",i,&i,NULL);CHKERRQ(ierr); 91 ierr = PCBDDCSetCoarseningRatio(pc,i);CHKERRQ(ierr); 92 i = pcbddc->max_levels; 93 ierr = PetscOptionsInt("-pc_bddc_levels","Set maximum number of levels for multilevel","PCBDDCSetLevels",i,&i,NULL);CHKERRQ(ierr); 94 ierr = PCBDDCSetLevels(pc,i);CHKERRQ(ierr); 95 ierr = PetscOptionsInt("-pc_bddc_coarse_eqs_limit","Set maximum number of equations on coarsest grid to aim for","none",pcbddc->coarse_eqs_limit,&pcbddc->coarse_eqs_limit,NULL);CHKERRQ(ierr); 96 ierr = PetscOptionsBool("-pc_bddc_use_coarse_estimates","Use estimated eigenvalues for coarse problem","none",pcbddc->use_coarse_estimates,&pcbddc->use_coarse_estimates,NULL);CHKERRQ(ierr); 97 ierr = PetscOptionsBool("-pc_bddc_use_deluxe_scaling","Use deluxe scaling for BDDC","none",pcbddc->use_deluxe_scaling,&pcbddc->use_deluxe_scaling,NULL);CHKERRQ(ierr); 98 ierr = PetscOptionsBool("-pc_bddc_schur_rebuild","Whether or not the interface graph for Schur principal minors has to be rebuilt (i.e. define the interface without any adjacency)","none",pcbddc->sub_schurs_rebuild,&pcbddc->sub_schurs_rebuild,NULL);CHKERRQ(ierr); 99 ierr = PetscOptionsInt("-pc_bddc_schur_layers","Number of dofs' layers for the computation of principal minors (i.e. -1 uses all dofs)","none",pcbddc->sub_schurs_layers,&pcbddc->sub_schurs_layers,NULL);CHKERRQ(ierr); 100 ierr = PetscOptionsBool("-pc_bddc_schur_use_useradj","Whether or not the CSR graph specified by the user should be used for computing successive layers (default is to use adj of local mat)","none",pcbddc->sub_schurs_use_useradj,&pcbddc->sub_schurs_use_useradj,NULL);CHKERRQ(ierr); 101 ierr = PetscOptionsBool("-pc_bddc_schur_exact","Whether or not to use the exact Schur complement instead of the reduced one (which excludes size 1 cc)","none",pcbddc->sub_schurs_exact_schur,&pcbddc->sub_schurs_exact_schur,NULL);CHKERRQ(ierr); 102 ierr = PetscOptionsBool("-pc_bddc_deluxe_zerorows","Zero rows and columns of deluxe operators associated with primal dofs","none",pcbddc->deluxe_zerorows,&pcbddc->deluxe_zerorows,NULL);CHKERRQ(ierr); 103 ierr = PetscOptionsBool("-pc_bddc_deluxe_singlemat","Collapse deluxe operators","none",pcbddc->deluxe_singlemat,&pcbddc->deluxe_singlemat,NULL);CHKERRQ(ierr); 104 ierr = PetscOptionsBool("-pc_bddc_adaptive_userdefined","Use user-defined constraints (should be attached via MatSetNearNullSpace to pmat) in addition to those adaptively generated","none",pcbddc->adaptive_userdefined,&pcbddc->adaptive_userdefined,NULL);CHKERRQ(ierr); 105 nt = 2; 106 ierr = PetscOptionsRealArray("-pc_bddc_adaptive_threshold","Thresholds to be used for adaptive selection of constraints","none",pcbddc->adaptive_threshold,&nt,NULL);CHKERRQ(ierr); 107 if (nt == 1) pcbddc->adaptive_threshold[1] = pcbddc->adaptive_threshold[0]; 108 ierr = PetscOptionsInt("-pc_bddc_adaptive_nmin","Minimum number of constraints per connected components","none",pcbddc->adaptive_nmin,&pcbddc->adaptive_nmin,NULL);CHKERRQ(ierr); 109 ierr = PetscOptionsInt("-pc_bddc_adaptive_nmax","Maximum number of constraints per connected components","none",pcbddc->adaptive_nmax,&pcbddc->adaptive_nmax,NULL);CHKERRQ(ierr); 110 ierr = PetscOptionsBool("-pc_bddc_symmetric","Symmetric computation of primal basis functions","none",pcbddc->symmetric_primal,&pcbddc->symmetric_primal,NULL);CHKERRQ(ierr); 111 ierr = PetscOptionsInt("-pc_bddc_coarse_adj","Number of processors where to map the coarse adjacency list","none",pcbddc->coarse_adj_red,&pcbddc->coarse_adj_red,NULL);CHKERRQ(ierr); 112 ierr = PetscOptionsBool("-pc_bddc_benign_trick","Apply the benign subspace trick to saddle point problems with discontinuous pressures","none",pcbddc->benign_saddle_point,&pcbddc->benign_saddle_point,NULL);CHKERRQ(ierr); 113 ierr = PetscOptionsBool("-pc_bddc_benign_change","Compute the pressure change of basis explicitly","none",pcbddc->benign_change_explicit,&pcbddc->benign_change_explicit,NULL);CHKERRQ(ierr); 114 ierr = PetscOptionsBool("-pc_bddc_benign_compute_correction","Compute the benign correction during PreSolve","none",pcbddc->benign_compute_correction,&pcbddc->benign_compute_correction,NULL);CHKERRQ(ierr); 115 ierr = PetscOptionsBool("-pc_bddc_nonetflux","Automatic computation of no-net-flux quadrature weights","none",pcbddc->compute_nonetflux,&pcbddc->compute_nonetflux,NULL);CHKERRQ(ierr); 116 ierr = PetscOptionsBool("-pc_bddc_detect_disconnected","Detects disconnected subdomains","none",pcbddc->detect_disconnected,&pcbddc->detect_disconnected,NULL);CHKERRQ(ierr); 117 ierr = PetscOptionsBool("-pc_bddc_detect_disconnected_filter","Filters out small entries in the local matrix when detecting disconnected subdomains","none",pcbddc->detect_disconnected_filter,&pcbddc->detect_disconnected_filter,NULL);CHKERRQ(ierr); 118 ierr = PetscOptionsBool("-pc_bddc_eliminate_dirichlet","Whether or not we want to eliminate dirichlet dofs during presolve","none",pcbddc->eliminate_dirdofs,&pcbddc->eliminate_dirdofs,NULL);CHKERRQ(ierr); 119 ierr = PetscOptionsTail();CHKERRQ(ierr); 120 PetscFunctionReturn(0); 121 } 122 123 static PetscErrorCode PCView_BDDC(PC pc,PetscViewer viewer) 124 { 125 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 126 PC_IS *pcis = (PC_IS*)pc->data; 127 PetscErrorCode ierr; 128 PetscBool isascii; 129 PetscSubcomm subcomm; 130 PetscViewer subviewer; 131 132 PetscFunctionBegin; 133 ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&isascii);CHKERRQ(ierr); 134 /* ASCII viewer */ 135 if (isascii) { 136 PetscMPIInt color,rank,size; 137 PetscInt64 loc[7],gsum[6],gmax[6],gmin[6],totbenign; 138 PetscScalar interface_size; 139 PetscReal ratio1=0.,ratio2=0.; 140 Vec counter; 141 142 if (!pc->setupcalled) { 143 ierr = PetscViewerASCIIPrintf(viewer," Partial information available: preconditioner has not been setup yet\n");CHKERRQ(ierr); 144 } 145 ierr = PetscViewerASCIIPrintf(viewer," Use verbose output: %D\n",pcbddc->dbg_flag);CHKERRQ(ierr); 146 ierr = PetscViewerASCIIPrintf(viewer," Use user-defined CSR: %d\n",!!pcbddc->mat_graph->nvtxs_csr);CHKERRQ(ierr); 147 ierr = PetscViewerASCIIPrintf(viewer," Use local mat graph: %d\n",pcbddc->use_local_adj && !pcbddc->mat_graph->nvtxs_csr);CHKERRQ(ierr); 148 if (pcbddc->mat_graph->twodim) { 149 ierr = PetscViewerASCIIPrintf(viewer," Connectivity graph topological dimension: 2\n");CHKERRQ(ierr); 150 } else { 151 ierr = PetscViewerASCIIPrintf(viewer," Connectivity graph topological dimension: 3\n");CHKERRQ(ierr); 152 } 153 if (pcbddc->graphmaxcount != PETSC_MAX_INT) { 154 ierr = PetscViewerASCIIPrintf(viewer," Graph max count: %D\n",pcbddc->graphmaxcount);CHKERRQ(ierr); 155 } 156 ierr = PetscViewerASCIIPrintf(viewer," Use vertices: %d (vertex size %D)\n",pcbddc->use_vertices,pcbddc->vertex_size);CHKERRQ(ierr); 157 ierr = PetscViewerASCIIPrintf(viewer," Use edges: %d\n",pcbddc->use_edges);CHKERRQ(ierr); 158 ierr = PetscViewerASCIIPrintf(viewer," Use faces: %d\n",pcbddc->use_faces);CHKERRQ(ierr); 159 ierr = PetscViewerASCIIPrintf(viewer," Use true near null space: %d\n",pcbddc->use_nnsp_true);CHKERRQ(ierr); 160 ierr = PetscViewerASCIIPrintf(viewer," Use QR for single constraints on cc: %d\n",pcbddc->use_qr_single);CHKERRQ(ierr); 161 ierr = PetscViewerASCIIPrintf(viewer," Use change of basis on local edge nodes: %d\n",pcbddc->use_change_of_basis);CHKERRQ(ierr); 162 ierr = PetscViewerASCIIPrintf(viewer," Use change of basis on local face nodes: %d\n",pcbddc->use_change_on_faces);CHKERRQ(ierr); 163 ierr = PetscViewerASCIIPrintf(viewer," User defined change of basis matrix: %d\n",!!pcbddc->user_ChangeOfBasisMatrix);CHKERRQ(ierr); 164 ierr = PetscViewerASCIIPrintf(viewer," Has change of basis matrix: %d\n",!!pcbddc->ChangeOfBasisMatrix);CHKERRQ(ierr); 165 ierr = PetscViewerASCIIPrintf(viewer," Eliminate dirichlet boundary dofs: %d\n",pcbddc->eliminate_dirdofs);CHKERRQ(ierr); 166 ierr = PetscViewerASCIIPrintf(viewer," Switch on static condensation ops around the interface preconditioner: %d\n",pcbddc->switch_static);CHKERRQ(ierr); 167 ierr = PetscViewerASCIIPrintf(viewer," Use exact dirichlet trick: %d\n",pcbddc->use_exact_dirichlet_trick);CHKERRQ(ierr); 168 ierr = PetscViewerASCIIPrintf(viewer," Multilevel max levels: %D\n",pcbddc->max_levels);CHKERRQ(ierr); 169 ierr = PetscViewerASCIIPrintf(viewer," Multilevel coarsening ratio: %D\n",pcbddc->coarsening_ratio);CHKERRQ(ierr); 170 ierr = PetscViewerASCIIPrintf(viewer," Use estimated eigs for coarse problem: %d\n",pcbddc->use_coarse_estimates);CHKERRQ(ierr); 171 ierr = PetscViewerASCIIPrintf(viewer," Use deluxe scaling: %d\n",pcbddc->use_deluxe_scaling);CHKERRQ(ierr); 172 ierr = PetscViewerASCIIPrintf(viewer," Use deluxe zerorows: %d\n",pcbddc->deluxe_zerorows);CHKERRQ(ierr); 173 ierr = PetscViewerASCIIPrintf(viewer," Use deluxe singlemat: %d\n",pcbddc->deluxe_singlemat);CHKERRQ(ierr); 174 ierr = PetscViewerASCIIPrintf(viewer," Rebuild interface graph for Schur principal minors: %d\n",pcbddc->sub_schurs_rebuild);CHKERRQ(ierr); 175 ierr = PetscViewerASCIIPrintf(viewer," Number of dofs' layers for the computation of principal minors: %D\n",pcbddc->sub_schurs_layers);CHKERRQ(ierr); 176 ierr = PetscViewerASCIIPrintf(viewer," Use user CSR graph to compute successive layers: %d\n",pcbddc->sub_schurs_use_useradj);CHKERRQ(ierr); 177 if (pcbddc->adaptive_threshold[1] != pcbddc->adaptive_threshold[0]) { 178 ierr = PetscViewerASCIIPrintf(viewer," Adaptive constraint selection thresholds (active %d, userdefined %d): %g,%g\n",pcbddc->adaptive_selection,pcbddc->adaptive_userdefined,pcbddc->adaptive_threshold[0],pcbddc->adaptive_threshold[1]);CHKERRQ(ierr); 179 } else { 180 ierr = PetscViewerASCIIPrintf(viewer," Adaptive constraint selection threshold (active %d, userdefined %d): %g\n",pcbddc->adaptive_selection,pcbddc->adaptive_userdefined,pcbddc->adaptive_threshold[0]);CHKERRQ(ierr); 181 } 182 ierr = PetscViewerASCIIPrintf(viewer," Min constraints / connected component: %D\n",pcbddc->adaptive_nmin);CHKERRQ(ierr); 183 ierr = PetscViewerASCIIPrintf(viewer," Max constraints / connected component: %D\n",pcbddc->adaptive_nmax);CHKERRQ(ierr); 184 ierr = PetscViewerASCIIPrintf(viewer," Invert exact Schur complement for adaptive selection: %d\n",pcbddc->sub_schurs_exact_schur);CHKERRQ(ierr); 185 ierr = PetscViewerASCIIPrintf(viewer," Symmetric computation of primal basis functions: %d\n",pcbddc->symmetric_primal);CHKERRQ(ierr); 186 ierr = PetscViewerASCIIPrintf(viewer," Num. Procs. to map coarse adjacency list: %D\n",pcbddc->coarse_adj_red);CHKERRQ(ierr); 187 ierr = PetscViewerASCIIPrintf(viewer," Coarse eqs per proc (significant at the coarsest level): %D\n",pcbddc->coarse_eqs_per_proc);CHKERRQ(ierr); 188 ierr = PetscViewerASCIIPrintf(viewer," Detect disconnected: %d (filter %d)\n",pcbddc->detect_disconnected,pcbddc->detect_disconnected_filter);CHKERRQ(ierr); 189 ierr = PetscViewerASCIIPrintf(viewer," Benign subspace trick: %d (change explicit %d)\n",pcbddc->benign_saddle_point,pcbddc->benign_change_explicit);CHKERRQ(ierr); 190 ierr = PetscViewerASCIIPrintf(viewer," Benign subspace trick is active: %d\n",pcbddc->benign_have_null);CHKERRQ(ierr); 191 ierr = PetscViewerASCIIPrintf(viewer," Algebraic computation of no-net-flux: %d\n",pcbddc->compute_nonetflux);CHKERRQ(ierr); 192 if (!pc->setupcalled) PetscFunctionReturn(0); 193 194 /* compute interface size */ 195 ierr = VecSet(pcis->vec1_B,1.0);CHKERRQ(ierr); 196 ierr = MatCreateVecs(pc->pmat,&counter,0);CHKERRQ(ierr); 197 ierr = VecSet(counter,0.0);CHKERRQ(ierr); 198 ierr = VecScatterBegin(pcis->global_to_B,pcis->vec1_B,counter,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 199 ierr = VecScatterEnd(pcis->global_to_B,pcis->vec1_B,counter,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 200 ierr = VecSum(counter,&interface_size);CHKERRQ(ierr); 201 ierr = VecDestroy(&counter);CHKERRQ(ierr); 202 203 /* compute some statistics on the domain decomposition */ 204 gsum[0] = 1; 205 gsum[1] = gsum[2] = gsum[3] = gsum[4] = gsum[5] = 0; 206 loc[0] = !!pcis->n; 207 loc[1] = pcis->n - pcis->n_B; 208 loc[2] = pcis->n_B; 209 loc[3] = pcbddc->local_primal_size; 210 loc[4] = pcis->n; 211 loc[5] = pcbddc->n_local_subs > 0 ? pcbddc->n_local_subs : (pcis->n ? 1 : 0); 212 loc[6] = pcbddc->benign_n; 213 ierr = MPI_Reduce(loc,gsum,6,MPIU_INT64,MPI_SUM,0,PetscObjectComm((PetscObject)pc));CHKERRQ(ierr); 214 if (!loc[0]) loc[1] = loc[2] = loc[3] = loc[4] = loc[5] = -1; 215 ierr = MPI_Reduce(loc,gmax,6,MPIU_INT64,MPI_MAX,0,PetscObjectComm((PetscObject)pc));CHKERRQ(ierr); 216 if (!loc[0]) loc[1] = loc[2] = loc[3] = loc[4] = loc[5] = PETSC_MAX_INT; 217 ierr = MPI_Reduce(loc,gmin,6,MPIU_INT64,MPI_MIN,0,PetscObjectComm((PetscObject)pc));CHKERRQ(ierr); 218 ierr = MPI_Reduce(&loc[6],&totbenign,1,MPIU_INT64,MPI_SUM,0,PetscObjectComm((PetscObject)pc));CHKERRQ(ierr); 219 if (pcbddc->coarse_size) { 220 ratio1 = pc->pmat->rmap->N/(1.*pcbddc->coarse_size); 221 ratio2 = PetscRealPart(interface_size)/pcbddc->coarse_size; 222 } 223 ierr = PetscViewerASCIIPrintf(viewer,"********************************** STATISTICS AT LEVEL %d **********************************\n",pcbddc->current_level);CHKERRQ(ierr); 224 ierr = PetscViewerASCIIPrintf(viewer," Global dofs sizes: all %D interface %D coarse %D\n",pc->pmat->rmap->N,(PetscInt)PetscRealPart(interface_size),pcbddc->coarse_size);CHKERRQ(ierr); 225 ierr = PetscViewerASCIIPrintf(viewer," Coarsening ratios: all/coarse %D interface/coarse %D\n",(PetscInt)ratio1,(PetscInt)ratio2);CHKERRQ(ierr); 226 ierr = PetscViewerASCIIPrintf(viewer," Active processes : %D\n",(PetscInt)gsum[0]);CHKERRQ(ierr); 227 ierr = PetscViewerASCIIPrintf(viewer," Total subdomains : %D\n",(PetscInt)gsum[5]);CHKERRQ(ierr); 228 if (pcbddc->benign_have_null) { 229 ierr = PetscViewerASCIIPrintf(viewer," Benign subs : %D\n",(PetscInt)totbenign);CHKERRQ(ierr); 230 } 231 ierr = PetscViewerASCIIPrintf(viewer," Dofs type :\tMIN\tMAX\tMEAN\n");CHKERRQ(ierr); 232 ierr = PetscViewerASCIIPrintf(viewer," Interior dofs :\t%D\t%D\t%D\n",(PetscInt)gmin[1],(PetscInt)gmax[1],(PetscInt)(gsum[1]/gsum[0]));CHKERRQ(ierr); 233 ierr = PetscViewerASCIIPrintf(viewer," Interface dofs :\t%D\t%D\t%D\n",(PetscInt)gmin[2],(PetscInt)gmax[2],(PetscInt)(gsum[2]/gsum[0]));CHKERRQ(ierr); 234 ierr = PetscViewerASCIIPrintf(viewer," Primal dofs :\t%D\t%D\t%D\n",(PetscInt)gmin[3],(PetscInt)gmax[3],(PetscInt)(gsum[3]/gsum[0]));CHKERRQ(ierr); 235 ierr = PetscViewerASCIIPrintf(viewer," Local dofs :\t%D\t%D\t%D\n",(PetscInt)gmin[4],(PetscInt)gmax[4],(PetscInt)(gsum[4]/gsum[0]));CHKERRQ(ierr); 236 ierr = PetscViewerASCIIPrintf(viewer," Local subs :\t%D\t%D\n" ,(PetscInt)gmin[5],(PetscInt)gmax[5]);CHKERRQ(ierr); 237 ierr = PetscViewerFlush(viewer);CHKERRQ(ierr); 238 239 ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)pc),&rank);CHKERRQ(ierr); 240 241 /* local solvers */ 242 ierr = PetscViewerGetSubViewer(viewer,PetscObjectComm((PetscObject)pcbddc->ksp_D),&subviewer);CHKERRQ(ierr); 243 if (!rank) { 244 ierr = PetscViewerASCIIPrintf(subviewer,"--- Interior solver (rank 0)\n");CHKERRQ(ierr); 245 ierr = PetscViewerASCIIPushTab(subviewer);CHKERRQ(ierr); 246 ierr = KSPView(pcbddc->ksp_D,subviewer);CHKERRQ(ierr); 247 ierr = PetscViewerASCIIPopTab(subviewer);CHKERRQ(ierr); 248 ierr = PetscViewerASCIIPrintf(subviewer,"--- Correction solver (rank 0)\n");CHKERRQ(ierr); 249 ierr = PetscViewerASCIIPushTab(subviewer);CHKERRQ(ierr); 250 ierr = KSPView(pcbddc->ksp_R,subviewer);CHKERRQ(ierr); 251 ierr = PetscViewerASCIIPopTab(subviewer);CHKERRQ(ierr); 252 ierr = PetscViewerFlush(subviewer);CHKERRQ(ierr); 253 } 254 ierr = PetscViewerRestoreSubViewer(viewer,PetscObjectComm((PetscObject)pcbddc->ksp_D),&subviewer);CHKERRQ(ierr); 255 ierr = PetscViewerFlush(viewer);CHKERRQ(ierr); 256 257 /* the coarse problem can be handled by a different communicator */ 258 if (pcbddc->coarse_ksp) color = 1; 259 else color = 0; 260 ierr = MPI_Comm_size(PetscObjectComm((PetscObject)pc),&size);CHKERRQ(ierr); 261 ierr = PetscSubcommCreate(PetscObjectComm((PetscObject)pc),&subcomm);CHKERRQ(ierr); 262 ierr = PetscSubcommSetNumber(subcomm,PetscMin(size,2));CHKERRQ(ierr); 263 ierr = PetscSubcommSetTypeGeneral(subcomm,color,rank);CHKERRQ(ierr); 264 ierr = PetscViewerGetSubViewer(viewer,PetscSubcommChild(subcomm),&subviewer);CHKERRQ(ierr); 265 if (color == 1) { 266 ierr = PetscViewerASCIIPrintf(subviewer,"--- Coarse solver\n");CHKERRQ(ierr); 267 ierr = PetscViewerASCIIPushTab(subviewer);CHKERRQ(ierr); 268 ierr = KSPView(pcbddc->coarse_ksp,subviewer);CHKERRQ(ierr); 269 ierr = PetscViewerASCIIPopTab(subviewer);CHKERRQ(ierr); 270 ierr = PetscViewerFlush(subviewer);CHKERRQ(ierr); 271 } 272 ierr = PetscViewerRestoreSubViewer(viewer,PetscSubcommChild(subcomm),&subviewer);CHKERRQ(ierr); 273 ierr = PetscSubcommDestroy(&subcomm);CHKERRQ(ierr); 274 ierr = PetscViewerFlush(viewer);CHKERRQ(ierr); 275 } 276 PetscFunctionReturn(0); 277 } 278 279 static PetscErrorCode PCBDDCSetDiscreteGradient_BDDC(PC pc, Mat G, PetscInt order, PetscInt field, PetscBool global, PetscBool conforming) 280 { 281 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 282 PetscErrorCode ierr; 283 284 PetscFunctionBegin; 285 ierr = PetscObjectReference((PetscObject)G);CHKERRQ(ierr); 286 ierr = MatDestroy(&pcbddc->discretegradient);CHKERRQ(ierr); 287 pcbddc->discretegradient = G; 288 pcbddc->nedorder = order > 0 ? order : -order; 289 pcbddc->nedfield = field; 290 pcbddc->nedglobal = global; 291 pcbddc->conforming = conforming; 292 PetscFunctionReturn(0); 293 } 294 295 /*@ 296 PCBDDCSetDiscreteGradient - Sets the discrete gradient 297 298 Collective on PC 299 300 Input Parameters: 301 + pc - the preconditioning context 302 . G - the discrete gradient matrix (should be in AIJ format) 303 . order - the order of the Nedelec space (1 for the lowest order) 304 . field - the field id of the Nedelec dofs (not used if the fields have not been specified) 305 . global - the type of global ordering for the rows of G 306 - conforming - whether the mesh is conforming or not 307 308 Level: advanced 309 310 Notes: 311 The discrete gradient matrix G is used to analyze the subdomain edges, and it should not contain any zero entry. 312 For variable order spaces, the order should be set to zero. 313 If global is true, the rows of G should be given in global ordering for the whole dofs; 314 if false, the ordering should be global for the Nedelec field. 315 In the latter case, it should hold gid[i] < gid[j] iff geid[i] < geid[j], with gid the global orderding for all the dofs 316 and geid the one for the Nedelec field. 317 318 .seealso: PCBDDC,PCBDDCSetDofsSplitting(),PCBDDCSetDofsSplittingLocal() 319 @*/ 320 PetscErrorCode PCBDDCSetDiscreteGradient(PC pc, Mat G, PetscInt order, PetscInt field, PetscBool global, PetscBool conforming) 321 { 322 PetscErrorCode ierr; 323 324 PetscFunctionBegin; 325 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 326 PetscValidHeaderSpecific(G,MAT_CLASSID,2); 327 PetscValidLogicalCollectiveInt(pc,order,3); 328 PetscValidLogicalCollectiveInt(pc,field,4); 329 PetscValidLogicalCollectiveBool(pc,global,5); 330 PetscValidLogicalCollectiveBool(pc,conforming,6); 331 PetscCheckSameComm(pc,1,G,2); 332 ierr = PetscTryMethod(pc,"PCBDDCSetDiscreteGradient_C",(PC,Mat,PetscInt,PetscInt,PetscBool,PetscBool),(pc,G,order,field,global,conforming));CHKERRQ(ierr); 333 PetscFunctionReturn(0); 334 } 335 336 static PetscErrorCode PCBDDCSetDivergenceMat_BDDC(PC pc, Mat divudotp, PetscBool trans, IS vl2l) 337 { 338 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 339 PetscErrorCode ierr; 340 341 PetscFunctionBegin; 342 ierr = PetscObjectReference((PetscObject)divudotp);CHKERRQ(ierr); 343 ierr = MatDestroy(&pcbddc->divudotp);CHKERRQ(ierr); 344 pcbddc->divudotp = divudotp; 345 pcbddc->divudotp_trans = trans; 346 pcbddc->compute_nonetflux = PETSC_TRUE; 347 if (vl2l) { 348 ierr = PetscObjectReference((PetscObject)vl2l);CHKERRQ(ierr); 349 ierr = ISDestroy(&pcbddc->divudotp_vl2l);CHKERRQ(ierr); 350 pcbddc->divudotp_vl2l = vl2l; 351 } 352 PetscFunctionReturn(0); 353 } 354 355 /*@ 356 PCBDDCSetDivergenceMat - Sets the linear operator representing \int_\Omega \div {\bf u} \cdot p dx 357 358 Collective on PC 359 360 Input Parameters: 361 + pc - the preconditioning context 362 . divudotp - the matrix (must be of type MATIS) 363 . trans - if trans if false (resp. true), then pressures are in the test (trial) space and velocities are in the trial (test) space. 364 - vl2l - optional index set describing the local (wrt the local matrix in divudotp) to local (wrt the local matrix in the preconditioning matrix) map for the velocities 365 366 Level: advanced 367 368 Notes: 369 This auxiliary matrix is used to compute quadrature weights representing the net-flux across subdomain boundaries 370 If vl2l is NULL, the local ordering for velocities in divudotp should match that of the preconditioning matrix 371 372 .seealso: PCBDDC 373 @*/ 374 PetscErrorCode PCBDDCSetDivergenceMat(PC pc, Mat divudotp, PetscBool trans, IS vl2l) 375 { 376 PetscBool ismatis; 377 PetscErrorCode ierr; 378 379 PetscFunctionBegin; 380 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 381 PetscValidHeaderSpecific(divudotp,MAT_CLASSID,2); 382 PetscCheckSameComm(pc,1,divudotp,2); 383 PetscValidLogicalCollectiveBool(pc,trans,3); 384 if (vl2l) PetscValidHeaderSpecific(vl2l,IS_CLASSID,4); 385 ierr = PetscObjectTypeCompare((PetscObject)divudotp,MATIS,&ismatis);CHKERRQ(ierr); 386 if (!ismatis) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONG,"Divergence matrix needs to be of type MATIS"); 387 ierr = PetscTryMethod(pc,"PCBDDCSetDivergenceMat_C",(PC,Mat,PetscBool,IS),(pc,divudotp,trans,vl2l));CHKERRQ(ierr); 388 PetscFunctionReturn(0); 389 } 390 391 static PetscErrorCode PCBDDCSetChangeOfBasisMat_BDDC(PC pc, Mat change, PetscBool interior) 392 { 393 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 394 PetscErrorCode ierr; 395 396 PetscFunctionBegin; 397 ierr = PetscObjectReference((PetscObject)change);CHKERRQ(ierr); 398 ierr = MatDestroy(&pcbddc->user_ChangeOfBasisMatrix);CHKERRQ(ierr); 399 pcbddc->user_ChangeOfBasisMatrix = change; 400 pcbddc->change_interior = interior; 401 PetscFunctionReturn(0); 402 } 403 /*@ 404 PCBDDCSetChangeOfBasisMat - Set user defined change of basis for dofs 405 406 Collective on PC 407 408 Input Parameters: 409 + pc - the preconditioning context 410 . change - the change of basis matrix 411 - interior - whether or not the change of basis modifies interior dofs 412 413 Level: intermediate 414 415 Notes: 416 417 .seealso: PCBDDC 418 @*/ 419 PetscErrorCode PCBDDCSetChangeOfBasisMat(PC pc, Mat change, PetscBool interior) 420 { 421 PetscErrorCode ierr; 422 423 PetscFunctionBegin; 424 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 425 PetscValidHeaderSpecific(change,MAT_CLASSID,2); 426 PetscCheckSameComm(pc,1,change,2); 427 if (pc->mat) { 428 PetscInt rows_c,cols_c,rows,cols; 429 ierr = MatGetSize(pc->mat,&rows,&cols);CHKERRQ(ierr); 430 ierr = MatGetSize(change,&rows_c,&cols_c);CHKERRQ(ierr); 431 if (rows_c != rows) SETERRQ2(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Invalid number of rows for change of basis matrix! %D != %D",rows_c,rows); 432 if (cols_c != cols) SETERRQ2(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Invalid number of columns for change of basis matrix! %D != %D",cols_c,cols); 433 ierr = MatGetLocalSize(pc->mat,&rows,&cols);CHKERRQ(ierr); 434 ierr = MatGetLocalSize(change,&rows_c,&cols_c);CHKERRQ(ierr); 435 if (rows_c != rows) SETERRQ2(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Invalid number of local rows for change of basis matrix! %D != %D",rows_c,rows); 436 if (cols_c != cols) SETERRQ2(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Invalid number of local columns for change of basis matrix! %D != %D",cols_c,cols); 437 } 438 ierr = PetscTryMethod(pc,"PCBDDCSetChangeOfBasisMat_C",(PC,Mat,PetscBool),(pc,change,interior));CHKERRQ(ierr); 439 PetscFunctionReturn(0); 440 } 441 442 static PetscErrorCode PCBDDCSetPrimalVerticesIS_BDDC(PC pc, IS PrimalVertices) 443 { 444 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 445 PetscBool isequal = PETSC_FALSE; 446 PetscErrorCode ierr; 447 448 PetscFunctionBegin; 449 ierr = PetscObjectReference((PetscObject)PrimalVertices);CHKERRQ(ierr); 450 if (pcbddc->user_primal_vertices) { 451 ierr = ISEqual(PrimalVertices,pcbddc->user_primal_vertices,&isequal);CHKERRQ(ierr); 452 } 453 ierr = ISDestroy(&pcbddc->user_primal_vertices);CHKERRQ(ierr); 454 ierr = ISDestroy(&pcbddc->user_primal_vertices_local);CHKERRQ(ierr); 455 pcbddc->user_primal_vertices = PrimalVertices; 456 if (!isequal) pcbddc->recompute_topography = PETSC_TRUE; 457 PetscFunctionReturn(0); 458 } 459 460 /*@ 461 PCBDDCSetPrimalVerticesIS - Set additional user defined primal vertices in PCBDDC 462 463 Collective 464 465 Input Parameters: 466 + pc - the preconditioning context 467 - PrimalVertices - index set of primal vertices in global numbering (can be empty) 468 469 Level: intermediate 470 471 Notes: 472 Any process can list any global node 473 474 .seealso: PCBDDC, PCBDDCGetPrimalVerticesIS(), PCBDDCSetPrimalVerticesLocalIS(), PCBDDCGetPrimalVerticesLocalIS() 475 @*/ 476 PetscErrorCode PCBDDCSetPrimalVerticesIS(PC pc, IS PrimalVertices) 477 { 478 PetscErrorCode ierr; 479 480 PetscFunctionBegin; 481 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 482 PetscValidHeaderSpecific(PrimalVertices,IS_CLASSID,2); 483 PetscCheckSameComm(pc,1,PrimalVertices,2); 484 ierr = PetscTryMethod(pc,"PCBDDCSetPrimalVerticesIS_C",(PC,IS),(pc,PrimalVertices));CHKERRQ(ierr); 485 PetscFunctionReturn(0); 486 } 487 488 static PetscErrorCode PCBDDCGetPrimalVerticesIS_BDDC(PC pc, IS *is) 489 { 490 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 491 492 PetscFunctionBegin; 493 *is = pcbddc->user_primal_vertices; 494 PetscFunctionReturn(0); 495 } 496 497 /*@ 498 PCBDDCGetPrimalVerticesIS - Get user defined primal vertices set with PCBDDCSetPrimalVerticesIS() 499 500 Collective 501 502 Input Parameters: 503 . pc - the preconditioning context 504 505 Output Parameters: 506 . is - index set of primal vertices in global numbering (NULL if not set) 507 508 Level: intermediate 509 510 Notes: 511 512 .seealso: PCBDDC, PCBDDCSetPrimalVerticesIS(), PCBDDCSetPrimalVerticesLocalIS(), PCBDDCGetPrimalVerticesLocalIS() 513 @*/ 514 PetscErrorCode PCBDDCGetPrimalVerticesIS(PC pc, IS *is) 515 { 516 PetscErrorCode ierr; 517 518 PetscFunctionBegin; 519 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 520 PetscValidPointer(is,2); 521 ierr = PetscUseMethod(pc,"PCBDDCGetPrimalVerticesIS_C",(PC,IS*),(pc,is));CHKERRQ(ierr); 522 PetscFunctionReturn(0); 523 } 524 525 static PetscErrorCode PCBDDCSetPrimalVerticesLocalIS_BDDC(PC pc, IS PrimalVertices) 526 { 527 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 528 PetscBool isequal = PETSC_FALSE; 529 PetscErrorCode ierr; 530 531 PetscFunctionBegin; 532 ierr = PetscObjectReference((PetscObject)PrimalVertices);CHKERRQ(ierr); 533 if (pcbddc->user_primal_vertices_local) { 534 ierr = ISEqual(PrimalVertices,pcbddc->user_primal_vertices_local,&isequal);CHKERRQ(ierr); 535 } 536 ierr = ISDestroy(&pcbddc->user_primal_vertices);CHKERRQ(ierr); 537 ierr = ISDestroy(&pcbddc->user_primal_vertices_local);CHKERRQ(ierr); 538 pcbddc->user_primal_vertices_local = PrimalVertices; 539 if (!isequal) pcbddc->recompute_topography = PETSC_TRUE; 540 PetscFunctionReturn(0); 541 } 542 543 /*@ 544 PCBDDCSetPrimalVerticesLocalIS - Set additional user defined primal vertices in PCBDDC 545 546 Collective 547 548 Input Parameters: 549 + pc - the preconditioning context 550 - PrimalVertices - index set of primal vertices in local numbering (can be empty) 551 552 Level: intermediate 553 554 Notes: 555 556 .seealso: PCBDDC, PCBDDCSetPrimalVerticesIS(), PCBDDCGetPrimalVerticesIS(), PCBDDCGetPrimalVerticesLocalIS() 557 @*/ 558 PetscErrorCode PCBDDCSetPrimalVerticesLocalIS(PC pc, IS PrimalVertices) 559 { 560 PetscErrorCode ierr; 561 562 PetscFunctionBegin; 563 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 564 PetscValidHeaderSpecific(PrimalVertices,IS_CLASSID,2); 565 PetscCheckSameComm(pc,1,PrimalVertices,2); 566 ierr = PetscTryMethod(pc,"PCBDDCSetPrimalVerticesLocalIS_C",(PC,IS),(pc,PrimalVertices));CHKERRQ(ierr); 567 PetscFunctionReturn(0); 568 } 569 570 static PetscErrorCode PCBDDCGetPrimalVerticesLocalIS_BDDC(PC pc, IS *is) 571 { 572 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 573 574 PetscFunctionBegin; 575 *is = pcbddc->user_primal_vertices_local; 576 PetscFunctionReturn(0); 577 } 578 579 /*@ 580 PCBDDCGetPrimalVerticesLocalIS - Get user defined primal vertices set with PCBDDCSetPrimalVerticesLocalIS() 581 582 Collective 583 584 Input Parameters: 585 . pc - the preconditioning context 586 587 Output Parameters: 588 . is - index set of primal vertices in local numbering (NULL if not set) 589 590 Level: intermediate 591 592 Notes: 593 594 .seealso: PCBDDC, PCBDDCSetPrimalVerticesIS(), PCBDDCGetPrimalVerticesIS(), PCBDDCSetPrimalVerticesLocalIS() 595 @*/ 596 PetscErrorCode PCBDDCGetPrimalVerticesLocalIS(PC pc, IS *is) 597 { 598 PetscErrorCode ierr; 599 600 PetscFunctionBegin; 601 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 602 PetscValidPointer(is,2); 603 ierr = PetscUseMethod(pc,"PCBDDCGetPrimalVerticesLocalIS_C",(PC,IS*),(pc,is));CHKERRQ(ierr); 604 PetscFunctionReturn(0); 605 } 606 607 static PetscErrorCode PCBDDCSetCoarseningRatio_BDDC(PC pc,PetscInt k) 608 { 609 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 610 611 PetscFunctionBegin; 612 pcbddc->coarsening_ratio = k; 613 PetscFunctionReturn(0); 614 } 615 616 /*@ 617 PCBDDCSetCoarseningRatio - Set coarsening ratio used in multilevel 618 619 Logically collective on PC 620 621 Input Parameters: 622 + pc - the preconditioning context 623 - k - coarsening ratio (H/h at the coarser level) 624 625 Options Database Keys: 626 . -pc_bddc_coarsening_ratio 627 628 Level: intermediate 629 630 Notes: 631 Approximatively k subdomains at the finer level will be aggregated into a single subdomain at the coarser level 632 633 .seealso: PCBDDC, PCBDDCSetLevels() 634 @*/ 635 PetscErrorCode PCBDDCSetCoarseningRatio(PC pc,PetscInt k) 636 { 637 PetscErrorCode ierr; 638 639 PetscFunctionBegin; 640 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 641 PetscValidLogicalCollectiveInt(pc,k,2); 642 ierr = PetscTryMethod(pc,"PCBDDCSetCoarseningRatio_C",(PC,PetscInt),(pc,k));CHKERRQ(ierr); 643 PetscFunctionReturn(0); 644 } 645 646 /* The following functions (PCBDDCSetUseExactDirichlet PCBDDCSetLevel) are not public */ 647 static PetscErrorCode PCBDDCSetUseExactDirichlet_BDDC(PC pc,PetscBool flg) 648 { 649 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 650 651 PetscFunctionBegin; 652 pcbddc->use_exact_dirichlet_trick = flg; 653 PetscFunctionReturn(0); 654 } 655 656 PetscErrorCode PCBDDCSetUseExactDirichlet(PC pc,PetscBool flg) 657 { 658 PetscErrorCode ierr; 659 660 PetscFunctionBegin; 661 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 662 PetscValidLogicalCollectiveBool(pc,flg,2); 663 ierr = PetscTryMethod(pc,"PCBDDCSetUseExactDirichlet_C",(PC,PetscBool),(pc,flg));CHKERRQ(ierr); 664 PetscFunctionReturn(0); 665 } 666 667 static PetscErrorCode PCBDDCSetLevel_BDDC(PC pc,PetscInt level) 668 { 669 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 670 671 PetscFunctionBegin; 672 pcbddc->current_level = level; 673 PetscFunctionReturn(0); 674 } 675 676 PetscErrorCode PCBDDCSetLevel(PC pc,PetscInt level) 677 { 678 PetscErrorCode ierr; 679 680 PetscFunctionBegin; 681 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 682 PetscValidLogicalCollectiveInt(pc,level,2); 683 ierr = PetscTryMethod(pc,"PCBDDCSetLevel_C",(PC,PetscInt),(pc,level));CHKERRQ(ierr); 684 PetscFunctionReturn(0); 685 } 686 687 static PetscErrorCode PCBDDCSetLevels_BDDC(PC pc,PetscInt levels) 688 { 689 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 690 691 PetscFunctionBegin; 692 if (levels > PETSC_PCBDDC_MAXLEVELS-1) SETERRQ1(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Maximum number of additional levels for BDDC is %d",PETSC_PCBDDC_MAXLEVELS-1); 693 pcbddc->max_levels = levels; 694 PetscFunctionReturn(0); 695 } 696 697 /*@ 698 PCBDDCSetLevels - Sets the maximum number of additional levels allowed for multilevel BDDC 699 700 Logically collective on PC 701 702 Input Parameters: 703 + pc - the preconditioning context 704 - levels - the maximum number of levels 705 706 Options Database Keys: 707 . -pc_bddc_levels 708 709 Level: intermediate 710 711 Notes: 712 The default value is 0, that gives the classical two-levels BDDC 713 714 .seealso: PCBDDC, PCBDDCSetCoarseningRatio() 715 @*/ 716 PetscErrorCode PCBDDCSetLevels(PC pc,PetscInt levels) 717 { 718 PetscErrorCode ierr; 719 720 PetscFunctionBegin; 721 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 722 PetscValidLogicalCollectiveInt(pc,levels,2); 723 ierr = PetscTryMethod(pc,"PCBDDCSetLevels_C",(PC,PetscInt),(pc,levels));CHKERRQ(ierr); 724 PetscFunctionReturn(0); 725 } 726 727 static PetscErrorCode PCBDDCSetDirichletBoundaries_BDDC(PC pc,IS DirichletBoundaries) 728 { 729 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 730 PetscBool isequal = PETSC_FALSE; 731 PetscErrorCode ierr; 732 733 PetscFunctionBegin; 734 ierr = PetscObjectReference((PetscObject)DirichletBoundaries);CHKERRQ(ierr); 735 if (pcbddc->DirichletBoundaries) { 736 ierr = ISEqual(DirichletBoundaries,pcbddc->DirichletBoundaries,&isequal);CHKERRQ(ierr); 737 } 738 /* last user setting takes precendence -> destroy any other customization */ 739 ierr = ISDestroy(&pcbddc->DirichletBoundariesLocal);CHKERRQ(ierr); 740 ierr = ISDestroy(&pcbddc->DirichletBoundaries);CHKERRQ(ierr); 741 pcbddc->DirichletBoundaries = DirichletBoundaries; 742 if (!isequal) pcbddc->recompute_topography = PETSC_TRUE; 743 PetscFunctionReturn(0); 744 } 745 746 /*@ 747 PCBDDCSetDirichletBoundaries - Set IS defining Dirichlet boundaries for the global problem. 748 749 Collective 750 751 Input Parameters: 752 + pc - the preconditioning context 753 - DirichletBoundaries - parallel IS defining the Dirichlet boundaries 754 755 Level: intermediate 756 757 Notes: 758 Provide the information if you used MatZeroRows/Columns routines. Any process can list any global node 759 760 .seealso: PCBDDC, PCBDDCSetDirichletBoundariesLocal(), MatZeroRows(), MatZeroRowsColumns() 761 @*/ 762 PetscErrorCode PCBDDCSetDirichletBoundaries(PC pc,IS DirichletBoundaries) 763 { 764 PetscErrorCode ierr; 765 766 PetscFunctionBegin; 767 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 768 PetscValidHeaderSpecific(DirichletBoundaries,IS_CLASSID,2); 769 PetscCheckSameComm(pc,1,DirichletBoundaries,2); 770 ierr = PetscTryMethod(pc,"PCBDDCSetDirichletBoundaries_C",(PC,IS),(pc,DirichletBoundaries));CHKERRQ(ierr); 771 PetscFunctionReturn(0); 772 } 773 774 static PetscErrorCode PCBDDCSetDirichletBoundariesLocal_BDDC(PC pc,IS DirichletBoundaries) 775 { 776 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 777 PetscBool isequal = PETSC_FALSE; 778 PetscErrorCode ierr; 779 780 PetscFunctionBegin; 781 ierr = PetscObjectReference((PetscObject)DirichletBoundaries);CHKERRQ(ierr); 782 if (pcbddc->DirichletBoundariesLocal) { 783 ierr = ISEqual(DirichletBoundaries,pcbddc->DirichletBoundariesLocal,&isequal);CHKERRQ(ierr); 784 } 785 /* last user setting takes precendence -> destroy any other customization */ 786 ierr = ISDestroy(&pcbddc->DirichletBoundariesLocal);CHKERRQ(ierr); 787 ierr = ISDestroy(&pcbddc->DirichletBoundaries);CHKERRQ(ierr); 788 pcbddc->DirichletBoundariesLocal = DirichletBoundaries; 789 if (!isequal) pcbddc->recompute_topography = PETSC_TRUE; 790 PetscFunctionReturn(0); 791 } 792 793 /*@ 794 PCBDDCSetDirichletBoundariesLocal - Set IS defining Dirichlet boundaries for the global problem in local ordering. 795 796 Collective 797 798 Input Parameters: 799 + pc - the preconditioning context 800 - DirichletBoundaries - parallel IS defining the Dirichlet boundaries (in local ordering) 801 802 Level: intermediate 803 804 Notes: 805 806 .seealso: PCBDDC, PCBDDCSetDirichletBoundaries(), MatZeroRows(), MatZeroRowsColumns() 807 @*/ 808 PetscErrorCode PCBDDCSetDirichletBoundariesLocal(PC pc,IS DirichletBoundaries) 809 { 810 PetscErrorCode ierr; 811 812 PetscFunctionBegin; 813 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 814 PetscValidHeaderSpecific(DirichletBoundaries,IS_CLASSID,2); 815 PetscCheckSameComm(pc,1,DirichletBoundaries,2); 816 ierr = PetscTryMethod(pc,"PCBDDCSetDirichletBoundariesLocal_C",(PC,IS),(pc,DirichletBoundaries));CHKERRQ(ierr); 817 PetscFunctionReturn(0); 818 } 819 820 static PetscErrorCode PCBDDCSetNeumannBoundaries_BDDC(PC pc,IS NeumannBoundaries) 821 { 822 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 823 PetscBool isequal = PETSC_FALSE; 824 PetscErrorCode ierr; 825 826 PetscFunctionBegin; 827 ierr = PetscObjectReference((PetscObject)NeumannBoundaries);CHKERRQ(ierr); 828 if (pcbddc->NeumannBoundaries) { 829 ierr = ISEqual(NeumannBoundaries,pcbddc->NeumannBoundaries,&isequal);CHKERRQ(ierr); 830 } 831 /* last user setting takes precendence -> destroy any other customization */ 832 ierr = ISDestroy(&pcbddc->NeumannBoundariesLocal);CHKERRQ(ierr); 833 ierr = ISDestroy(&pcbddc->NeumannBoundaries);CHKERRQ(ierr); 834 pcbddc->NeumannBoundaries = NeumannBoundaries; 835 if (!isequal) pcbddc->recompute_topography = PETSC_TRUE; 836 PetscFunctionReturn(0); 837 } 838 839 /*@ 840 PCBDDCSetNeumannBoundaries - Set IS defining Neumann boundaries for the global problem. 841 842 Collective 843 844 Input Parameters: 845 + pc - the preconditioning context 846 - NeumannBoundaries - parallel IS defining the Neumann boundaries 847 848 Level: intermediate 849 850 Notes: 851 Any process can list any global node 852 853 .seealso: PCBDDC, PCBDDCSetNeumannBoundariesLocal() 854 @*/ 855 PetscErrorCode PCBDDCSetNeumannBoundaries(PC pc,IS NeumannBoundaries) 856 { 857 PetscErrorCode ierr; 858 859 PetscFunctionBegin; 860 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 861 PetscValidHeaderSpecific(NeumannBoundaries,IS_CLASSID,2); 862 PetscCheckSameComm(pc,1,NeumannBoundaries,2); 863 ierr = PetscTryMethod(pc,"PCBDDCSetNeumannBoundaries_C",(PC,IS),(pc,NeumannBoundaries));CHKERRQ(ierr); 864 PetscFunctionReturn(0); 865 } 866 867 static PetscErrorCode PCBDDCSetNeumannBoundariesLocal_BDDC(PC pc,IS NeumannBoundaries) 868 { 869 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 870 PetscBool isequal = PETSC_FALSE; 871 PetscErrorCode ierr; 872 873 PetscFunctionBegin; 874 ierr = PetscObjectReference((PetscObject)NeumannBoundaries);CHKERRQ(ierr); 875 if (pcbddc->NeumannBoundariesLocal) { 876 ierr = ISEqual(NeumannBoundaries,pcbddc->NeumannBoundariesLocal,&isequal);CHKERRQ(ierr); 877 } 878 /* last user setting takes precendence -> destroy any other customization */ 879 ierr = ISDestroy(&pcbddc->NeumannBoundariesLocal);CHKERRQ(ierr); 880 ierr = ISDestroy(&pcbddc->NeumannBoundaries);CHKERRQ(ierr); 881 pcbddc->NeumannBoundariesLocal = NeumannBoundaries; 882 if (!isequal) pcbddc->recompute_topography = PETSC_TRUE; 883 PetscFunctionReturn(0); 884 } 885 886 /*@ 887 PCBDDCSetNeumannBoundariesLocal - Set IS defining Neumann boundaries for the global problem in local ordering. 888 889 Collective 890 891 Input Parameters: 892 + pc - the preconditioning context 893 - NeumannBoundaries - parallel IS defining the subdomain part of Neumann boundaries (in local ordering) 894 895 Level: intermediate 896 897 Notes: 898 899 .seealso: PCBDDC, PCBDDCSetNeumannBoundaries() 900 @*/ 901 PetscErrorCode PCBDDCSetNeumannBoundariesLocal(PC pc,IS NeumannBoundaries) 902 { 903 PetscErrorCode ierr; 904 905 PetscFunctionBegin; 906 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 907 PetscValidHeaderSpecific(NeumannBoundaries,IS_CLASSID,2); 908 PetscCheckSameComm(pc,1,NeumannBoundaries,2); 909 ierr = PetscTryMethod(pc,"PCBDDCSetNeumannBoundariesLocal_C",(PC,IS),(pc,NeumannBoundaries));CHKERRQ(ierr); 910 PetscFunctionReturn(0); 911 } 912 913 static PetscErrorCode PCBDDCGetDirichletBoundaries_BDDC(PC pc,IS *DirichletBoundaries) 914 { 915 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 916 917 PetscFunctionBegin; 918 *DirichletBoundaries = pcbddc->DirichletBoundaries; 919 PetscFunctionReturn(0); 920 } 921 922 /*@ 923 PCBDDCGetDirichletBoundaries - Get parallel IS for Dirichlet boundaries 924 925 Collective 926 927 Input Parameters: 928 . pc - the preconditioning context 929 930 Output Parameters: 931 . DirichletBoundaries - index set defining the Dirichlet boundaries 932 933 Level: intermediate 934 935 Notes: 936 The IS returned (if any) is the same passed in earlier by the user with PCBDDCSetDirichletBoundaries 937 938 .seealso: PCBDDC 939 @*/ 940 PetscErrorCode PCBDDCGetDirichletBoundaries(PC pc,IS *DirichletBoundaries) 941 { 942 PetscErrorCode ierr; 943 944 PetscFunctionBegin; 945 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 946 ierr = PetscUseMethod(pc,"PCBDDCGetDirichletBoundaries_C",(PC,IS*),(pc,DirichletBoundaries));CHKERRQ(ierr); 947 PetscFunctionReturn(0); 948 } 949 950 static PetscErrorCode PCBDDCGetDirichletBoundariesLocal_BDDC(PC pc,IS *DirichletBoundaries) 951 { 952 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 953 954 PetscFunctionBegin; 955 *DirichletBoundaries = pcbddc->DirichletBoundariesLocal; 956 PetscFunctionReturn(0); 957 } 958 959 /*@ 960 PCBDDCGetDirichletBoundariesLocal - Get parallel IS for Dirichlet boundaries (in local ordering) 961 962 Collective 963 964 Input Parameters: 965 . pc - the preconditioning context 966 967 Output Parameters: 968 . DirichletBoundaries - index set defining the subdomain part of Dirichlet boundaries 969 970 Level: intermediate 971 972 Notes: 973 The IS returned could be the same passed in earlier by the user (if provided with PCBDDCSetDirichletBoundariesLocal) or a global-to-local map of the global IS (if provided with PCBDDCSetDirichletBoundaries). 974 In the latter case, the IS will be available after PCSetUp. 975 976 .seealso: PCBDDC 977 @*/ 978 PetscErrorCode PCBDDCGetDirichletBoundariesLocal(PC pc,IS *DirichletBoundaries) 979 { 980 PetscErrorCode ierr; 981 982 PetscFunctionBegin; 983 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 984 ierr = PetscUseMethod(pc,"PCBDDCGetDirichletBoundariesLocal_C",(PC,IS*),(pc,DirichletBoundaries));CHKERRQ(ierr); 985 PetscFunctionReturn(0); 986 } 987 988 static PetscErrorCode PCBDDCGetNeumannBoundaries_BDDC(PC pc,IS *NeumannBoundaries) 989 { 990 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 991 992 PetscFunctionBegin; 993 *NeumannBoundaries = pcbddc->NeumannBoundaries; 994 PetscFunctionReturn(0); 995 } 996 997 /*@ 998 PCBDDCGetNeumannBoundaries - Get parallel IS for Neumann boundaries 999 1000 Collective 1001 1002 Input Parameters: 1003 . pc - the preconditioning context 1004 1005 Output Parameters: 1006 . NeumannBoundaries - index set defining the Neumann boundaries 1007 1008 Level: intermediate 1009 1010 Notes: 1011 The IS returned (if any) is the same passed in earlier by the user with PCBDDCSetNeumannBoundaries 1012 1013 .seealso: PCBDDC 1014 @*/ 1015 PetscErrorCode PCBDDCGetNeumannBoundaries(PC pc,IS *NeumannBoundaries) 1016 { 1017 PetscErrorCode ierr; 1018 1019 PetscFunctionBegin; 1020 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 1021 ierr = PetscUseMethod(pc,"PCBDDCGetNeumannBoundaries_C",(PC,IS*),(pc,NeumannBoundaries));CHKERRQ(ierr); 1022 PetscFunctionReturn(0); 1023 } 1024 1025 static PetscErrorCode PCBDDCGetNeumannBoundariesLocal_BDDC(PC pc,IS *NeumannBoundaries) 1026 { 1027 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 1028 1029 PetscFunctionBegin; 1030 *NeumannBoundaries = pcbddc->NeumannBoundariesLocal; 1031 PetscFunctionReturn(0); 1032 } 1033 1034 /*@ 1035 PCBDDCGetNeumannBoundariesLocal - Get parallel IS for Neumann boundaries (in local ordering) 1036 1037 Collective 1038 1039 Input Parameters: 1040 . pc - the preconditioning context 1041 1042 Output Parameters: 1043 . NeumannBoundaries - index set defining the subdomain part of Neumann boundaries 1044 1045 Level: intermediate 1046 1047 Notes: 1048 The IS returned could be the same passed in earlier by the user (if provided with PCBDDCSetNeumannBoundariesLocal) or a global-to-local map of the global IS (if provided with PCBDDCSetNeumannBoundaries). 1049 In the latter case, the IS will be available after PCSetUp. 1050 1051 .seealso: PCBDDC 1052 @*/ 1053 PetscErrorCode PCBDDCGetNeumannBoundariesLocal(PC pc,IS *NeumannBoundaries) 1054 { 1055 PetscErrorCode ierr; 1056 1057 PetscFunctionBegin; 1058 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 1059 ierr = PetscUseMethod(pc,"PCBDDCGetNeumannBoundariesLocal_C",(PC,IS*),(pc,NeumannBoundaries));CHKERRQ(ierr); 1060 PetscFunctionReturn(0); 1061 } 1062 1063 static PetscErrorCode PCBDDCSetLocalAdjacencyGraph_BDDC(PC pc, PetscInt nvtxs,const PetscInt xadj[],const PetscInt adjncy[], PetscCopyMode copymode) 1064 { 1065 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 1066 PCBDDCGraph mat_graph = pcbddc->mat_graph; 1067 PetscBool same_data = PETSC_FALSE; 1068 PetscErrorCode ierr; 1069 1070 PetscFunctionBegin; 1071 if (!nvtxs) { 1072 if (copymode == PETSC_OWN_POINTER) { 1073 ierr = PetscFree(xadj);CHKERRQ(ierr); 1074 ierr = PetscFree(adjncy);CHKERRQ(ierr); 1075 } 1076 ierr = PCBDDCGraphResetCSR(mat_graph);CHKERRQ(ierr); 1077 PetscFunctionReturn(0); 1078 } 1079 if (mat_graph->nvtxs == nvtxs && mat_graph->freecsr) { /* we own the data */ 1080 if (mat_graph->xadj == xadj && mat_graph->adjncy == adjncy) same_data = PETSC_TRUE; 1081 if (!same_data && mat_graph->xadj[nvtxs] == xadj[nvtxs]) { 1082 ierr = PetscMemcmp(xadj,mat_graph->xadj,(nvtxs+1)*sizeof(PetscInt),&same_data);CHKERRQ(ierr); 1083 if (same_data) { 1084 ierr = PetscMemcmp(adjncy,mat_graph->adjncy,xadj[nvtxs]*sizeof(PetscInt),&same_data);CHKERRQ(ierr); 1085 } 1086 } 1087 } 1088 if (!same_data) { 1089 /* free old CSR */ 1090 ierr = PCBDDCGraphResetCSR(mat_graph);CHKERRQ(ierr); 1091 /* get CSR into graph structure */ 1092 if (copymode == PETSC_COPY_VALUES) { 1093 ierr = PetscMalloc1(nvtxs+1,&mat_graph->xadj);CHKERRQ(ierr); 1094 ierr = PetscMalloc1(xadj[nvtxs],&mat_graph->adjncy);CHKERRQ(ierr); 1095 ierr = PetscMemcpy(mat_graph->xadj,xadj,(nvtxs+1)*sizeof(PetscInt));CHKERRQ(ierr); 1096 ierr = PetscMemcpy(mat_graph->adjncy,adjncy,xadj[nvtxs]*sizeof(PetscInt));CHKERRQ(ierr); 1097 mat_graph->freecsr = PETSC_TRUE; 1098 } else if (copymode == PETSC_OWN_POINTER) { 1099 mat_graph->xadj = (PetscInt*)xadj; 1100 mat_graph->adjncy = (PetscInt*)adjncy; 1101 mat_graph->freecsr = PETSC_TRUE; 1102 } else if (copymode == PETSC_USE_POINTER) { 1103 mat_graph->xadj = (PetscInt*)xadj; 1104 mat_graph->adjncy = (PetscInt*)adjncy; 1105 mat_graph->freecsr = PETSC_FALSE; 1106 } else SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"Unsupported copy mode %D",copymode); 1107 mat_graph->nvtxs_csr = nvtxs; 1108 pcbddc->recompute_topography = PETSC_TRUE; 1109 } 1110 PetscFunctionReturn(0); 1111 } 1112 1113 /*@ 1114 PCBDDCSetLocalAdjacencyGraph - Set adjacency structure (CSR graph) of the local degrees of freedom. 1115 1116 Not collective 1117 1118 Input Parameters: 1119 + pc - the preconditioning context. 1120 . nvtxs - number of local vertices of the graph (i.e., the number of local dofs). 1121 . xadj, adjncy - the connectivity of the dofs in CSR format. 1122 - copymode - supported modes are PETSC_COPY_VALUES, PETSC_USE_POINTER or PETSC_OWN_POINTER. 1123 1124 Level: intermediate 1125 1126 Notes: 1127 A dof is considered connected with all local dofs if xadj[dof+1]-xadj[dof] == 1 and adjncy[xadj[dof]] is negative. 1128 1129 .seealso: PCBDDC,PetscCopyMode 1130 @*/ 1131 PetscErrorCode PCBDDCSetLocalAdjacencyGraph(PC pc,PetscInt nvtxs,const PetscInt xadj[],const PetscInt adjncy[], PetscCopyMode copymode) 1132 { 1133 void (*f)(void) = 0; 1134 PetscErrorCode ierr; 1135 1136 PetscFunctionBegin; 1137 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 1138 if (nvtxs) { 1139 PetscValidIntPointer(xadj,3); 1140 if (xadj[nvtxs]) PetscValidIntPointer(adjncy,4); 1141 } 1142 ierr = PetscTryMethod(pc,"PCBDDCSetLocalAdjacencyGraph_C",(PC,PetscInt,const PetscInt[],const PetscInt[],PetscCopyMode),(pc,nvtxs,xadj,adjncy,copymode));CHKERRQ(ierr); 1143 /* free arrays if PCBDDC is not the PC type */ 1144 ierr = PetscObjectQueryFunction((PetscObject)pc,"PCBDDCSetLocalAdjacencyGraph_C",&f);CHKERRQ(ierr); 1145 if (!f && copymode == PETSC_OWN_POINTER) { 1146 ierr = PetscFree(xadj);CHKERRQ(ierr); 1147 ierr = PetscFree(adjncy);CHKERRQ(ierr); 1148 } 1149 PetscFunctionReturn(0); 1150 } 1151 1152 static PetscErrorCode PCBDDCSetDofsSplittingLocal_BDDC(PC pc,PetscInt n_is, IS ISForDofs[]) 1153 { 1154 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 1155 PetscInt i; 1156 PetscBool isequal = PETSC_FALSE; 1157 PetscErrorCode ierr; 1158 1159 PetscFunctionBegin; 1160 if (pcbddc->n_ISForDofsLocal == n_is) { 1161 for (i=0;i<n_is;i++) { 1162 PetscBool isequalt; 1163 ierr = ISEqual(ISForDofs[i],pcbddc->ISForDofsLocal[i],&isequalt);CHKERRQ(ierr); 1164 if (!isequalt) break; 1165 } 1166 if (i == n_is) isequal = PETSC_TRUE; 1167 } 1168 for (i=0;i<n_is;i++) { 1169 ierr = PetscObjectReference((PetscObject)ISForDofs[i]);CHKERRQ(ierr); 1170 } 1171 /* Destroy ISes if they were already set */ 1172 for (i=0;i<pcbddc->n_ISForDofsLocal;i++) { 1173 ierr = ISDestroy(&pcbddc->ISForDofsLocal[i]);CHKERRQ(ierr); 1174 } 1175 ierr = PetscFree(pcbddc->ISForDofsLocal);CHKERRQ(ierr); 1176 /* last user setting takes precendence -> destroy any other customization */ 1177 for (i=0;i<pcbddc->n_ISForDofs;i++) { 1178 ierr = ISDestroy(&pcbddc->ISForDofs[i]);CHKERRQ(ierr); 1179 } 1180 ierr = PetscFree(pcbddc->ISForDofs);CHKERRQ(ierr); 1181 pcbddc->n_ISForDofs = 0; 1182 /* allocate space then set */ 1183 if (n_is) { 1184 ierr = PetscMalloc1(n_is,&pcbddc->ISForDofsLocal);CHKERRQ(ierr); 1185 } 1186 for (i=0;i<n_is;i++) { 1187 pcbddc->ISForDofsLocal[i] = ISForDofs[i]; 1188 } 1189 pcbddc->n_ISForDofsLocal = n_is; 1190 if (n_is) pcbddc->user_provided_isfordofs = PETSC_TRUE; 1191 if (!isequal) pcbddc->recompute_topography = PETSC_TRUE; 1192 PetscFunctionReturn(0); 1193 } 1194 1195 /*@ 1196 PCBDDCSetDofsSplittingLocal - Set index sets defining fields of the local subdomain matrix 1197 1198 Collective 1199 1200 Input Parameters: 1201 + pc - the preconditioning context 1202 . n_is - number of index sets defining the fields 1203 - ISForDofs - array of IS describing the fields in local ordering 1204 1205 Level: intermediate 1206 1207 Notes: 1208 n_is should be the same among processes. Not all nodes need to be listed: unlisted nodes will belong to the complement field. 1209 1210 .seealso: PCBDDC 1211 @*/ 1212 PetscErrorCode PCBDDCSetDofsSplittingLocal(PC pc,PetscInt n_is, IS ISForDofs[]) 1213 { 1214 PetscInt i; 1215 PetscErrorCode ierr; 1216 1217 PetscFunctionBegin; 1218 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 1219 PetscValidLogicalCollectiveInt(pc,n_is,2); 1220 for (i=0;i<n_is;i++) { 1221 PetscCheckSameComm(pc,1,ISForDofs[i],3); 1222 PetscValidHeaderSpecific(ISForDofs[i],IS_CLASSID,3); 1223 } 1224 ierr = PetscTryMethod(pc,"PCBDDCSetDofsSplittingLocal_C",(PC,PetscInt,IS[]),(pc,n_is,ISForDofs));CHKERRQ(ierr); 1225 PetscFunctionReturn(0); 1226 } 1227 1228 static PetscErrorCode PCBDDCSetDofsSplitting_BDDC(PC pc,PetscInt n_is, IS ISForDofs[]) 1229 { 1230 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 1231 PetscInt i; 1232 PetscBool isequal = PETSC_FALSE; 1233 PetscErrorCode ierr; 1234 1235 PetscFunctionBegin; 1236 if (pcbddc->n_ISForDofs == n_is) { 1237 for (i=0;i<n_is;i++) { 1238 PetscBool isequalt; 1239 ierr = ISEqual(ISForDofs[i],pcbddc->ISForDofs[i],&isequalt);CHKERRQ(ierr); 1240 if (!isequalt) break; 1241 } 1242 if (i == n_is) isequal = PETSC_TRUE; 1243 } 1244 for (i=0;i<n_is;i++) { 1245 ierr = PetscObjectReference((PetscObject)ISForDofs[i]);CHKERRQ(ierr); 1246 } 1247 /* Destroy ISes if they were already set */ 1248 for (i=0;i<pcbddc->n_ISForDofs;i++) { 1249 ierr = ISDestroy(&pcbddc->ISForDofs[i]);CHKERRQ(ierr); 1250 } 1251 ierr = PetscFree(pcbddc->ISForDofs);CHKERRQ(ierr); 1252 /* last user setting takes precendence -> destroy any other customization */ 1253 for (i=0;i<pcbddc->n_ISForDofsLocal;i++) { 1254 ierr = ISDestroy(&pcbddc->ISForDofsLocal[i]);CHKERRQ(ierr); 1255 } 1256 ierr = PetscFree(pcbddc->ISForDofsLocal);CHKERRQ(ierr); 1257 pcbddc->n_ISForDofsLocal = 0; 1258 /* allocate space then set */ 1259 if (n_is) { 1260 ierr = PetscMalloc1(n_is,&pcbddc->ISForDofs);CHKERRQ(ierr); 1261 } 1262 for (i=0;i<n_is;i++) { 1263 pcbddc->ISForDofs[i] = ISForDofs[i]; 1264 } 1265 pcbddc->n_ISForDofs = n_is; 1266 if (n_is) pcbddc->user_provided_isfordofs = PETSC_TRUE; 1267 if (!isequal) pcbddc->recompute_topography = PETSC_TRUE; 1268 PetscFunctionReturn(0); 1269 } 1270 1271 /*@ 1272 PCBDDCSetDofsSplitting - Set index sets defining fields of the global matrix 1273 1274 Collective 1275 1276 Input Parameters: 1277 + pc - the preconditioning context 1278 . n_is - number of index sets defining the fields 1279 - ISForDofs - array of IS describing the fields in global ordering 1280 1281 Level: intermediate 1282 1283 Notes: 1284 Any process can list any global node. Not all nodes need to be listed: unlisted nodes will belong to the complement field. 1285 1286 .seealso: PCBDDC 1287 @*/ 1288 PetscErrorCode PCBDDCSetDofsSplitting(PC pc,PetscInt n_is, IS ISForDofs[]) 1289 { 1290 PetscInt i; 1291 PetscErrorCode ierr; 1292 1293 PetscFunctionBegin; 1294 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 1295 PetscValidLogicalCollectiveInt(pc,n_is,2); 1296 for (i=0;i<n_is;i++) { 1297 PetscValidHeaderSpecific(ISForDofs[i],IS_CLASSID,3); 1298 PetscCheckSameComm(pc,1,ISForDofs[i],3); 1299 } 1300 ierr = PetscTryMethod(pc,"PCBDDCSetDofsSplitting_C",(PC,PetscInt,IS[]),(pc,n_is,ISForDofs));CHKERRQ(ierr); 1301 PetscFunctionReturn(0); 1302 } 1303 1304 /* 1305 PCPreSolve_BDDC - Changes the right hand side and (if necessary) the initial 1306 guess if a transformation of basis approach has been selected. 1307 1308 Input Parameter: 1309 + pc - the preconditioner contex 1310 1311 Application Interface Routine: PCPreSolve() 1312 1313 Notes: 1314 The interface routine PCPreSolve() is not usually called directly by 1315 the user, but instead is called by KSPSolve(). 1316 */ 1317 static PetscErrorCode PCPreSolve_BDDC(PC pc, KSP ksp, Vec rhs, Vec x) 1318 { 1319 PetscErrorCode ierr; 1320 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 1321 PC_IS *pcis = (PC_IS*)(pc->data); 1322 Vec used_vec; 1323 PetscBool save_rhs = PETSC_TRUE, benign_correction_computed; 1324 1325 PetscFunctionBegin; 1326 /* if we are working with CG, one dirichlet solve can be avoided during Krylov iterations */ 1327 if (ksp) { 1328 PetscBool iscg, isgroppcg, ispipecg, ispipecgrr; 1329 ierr = PetscObjectTypeCompare((PetscObject)ksp,KSPCG,&iscg);CHKERRQ(ierr); 1330 ierr = PetscObjectTypeCompare((PetscObject)ksp,KSPGROPPCG,&isgroppcg);CHKERRQ(ierr); 1331 ierr = PetscObjectTypeCompare((PetscObject)ksp,KSPPIPECG,&ispipecg);CHKERRQ(ierr); 1332 ierr = PetscObjectTypeCompare((PetscObject)ksp,KSPPIPECGRR,&ispipecgrr);CHKERRQ(ierr); 1333 if (pcbddc->benign_apply_coarse_only || pcbddc->switch_static || (!iscg && !isgroppcg && !ispipecg && !ispipecgrr)) { 1334 ierr = PCBDDCSetUseExactDirichlet(pc,PETSC_FALSE);CHKERRQ(ierr); 1335 } 1336 } 1337 if (pcbddc->benign_apply_coarse_only || pcbddc->switch_static) { 1338 ierr = PCBDDCSetUseExactDirichlet(pc,PETSC_FALSE);CHKERRQ(ierr); 1339 } 1340 1341 /* Creates parallel work vectors used in presolve */ 1342 if (!pcbddc->original_rhs) { 1343 ierr = VecDuplicate(pcis->vec1_global,&pcbddc->original_rhs);CHKERRQ(ierr); 1344 } 1345 if (!pcbddc->temp_solution) { 1346 ierr = VecDuplicate(pcis->vec1_global,&pcbddc->temp_solution);CHKERRQ(ierr); 1347 } 1348 1349 pcbddc->temp_solution_used = PETSC_FALSE; 1350 if (x) { 1351 ierr = PetscObjectReference((PetscObject)x);CHKERRQ(ierr); 1352 used_vec = x; 1353 } else { /* it can only happen when calling PCBDDCMatFETIDPGetRHS */ 1354 ierr = PetscObjectReference((PetscObject)pcbddc->temp_solution);CHKERRQ(ierr); 1355 used_vec = pcbddc->temp_solution; 1356 ierr = VecSet(used_vec,0.0);CHKERRQ(ierr); 1357 pcbddc->temp_solution_used = PETSC_TRUE; 1358 ierr = VecCopy(rhs,pcbddc->original_rhs);CHKERRQ(ierr); 1359 save_rhs = PETSC_FALSE; 1360 pcbddc->eliminate_dirdofs = PETSC_TRUE; 1361 } 1362 1363 /* hack into ksp data structure since PCPreSolve comes earlier than setting to zero the guess in src/ksp/ksp/interface/itfunc.c */ 1364 if (ksp) { 1365 /* store the flag for the initial guess since it will be restored back during PCPostSolve_BDDC */ 1366 ierr = KSPGetInitialGuessNonzero(ksp,&pcbddc->ksp_guess_nonzero);CHKERRQ(ierr); 1367 if (!pcbddc->ksp_guess_nonzero) { 1368 ierr = VecSet(used_vec,0.0);CHKERRQ(ierr); 1369 } 1370 } 1371 1372 pcbddc->rhs_change = PETSC_FALSE; 1373 /* Take into account zeroed rows -> change rhs and store solution removed */ 1374 if (rhs && pcbddc->eliminate_dirdofs) { 1375 IS dirIS = NULL; 1376 1377 /* DirichletBoundariesLocal may not be consistent among neighbours; gets a dirichlet dofs IS from graph (may be cached) */ 1378 ierr = PCBDDCGraphGetDirichletDofs(pcbddc->mat_graph,&dirIS);CHKERRQ(ierr); 1379 if (dirIS) { 1380 Mat_IS *matis = (Mat_IS*)pc->pmat->data; 1381 PetscInt dirsize,i,*is_indices; 1382 PetscScalar *array_x; 1383 const PetscScalar *array_diagonal; 1384 1385 ierr = MatGetDiagonal(pc->pmat,pcis->vec1_global);CHKERRQ(ierr); 1386 ierr = VecPointwiseDivide(pcis->vec1_global,rhs,pcis->vec1_global);CHKERRQ(ierr); 1387 ierr = VecScatterBegin(matis->rctx,pcis->vec1_global,pcis->vec2_N,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1388 ierr = VecScatterEnd(matis->rctx,pcis->vec1_global,pcis->vec2_N,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1389 ierr = VecScatterBegin(matis->rctx,used_vec,pcis->vec1_N,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1390 ierr = VecScatterEnd(matis->rctx,used_vec,pcis->vec1_N,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1391 ierr = ISGetLocalSize(dirIS,&dirsize);CHKERRQ(ierr); 1392 ierr = VecGetArray(pcis->vec1_N,&array_x);CHKERRQ(ierr); 1393 ierr = VecGetArrayRead(pcis->vec2_N,&array_diagonal);CHKERRQ(ierr); 1394 ierr = ISGetIndices(dirIS,(const PetscInt**)&is_indices);CHKERRQ(ierr); 1395 for (i=0; i<dirsize; i++) array_x[is_indices[i]] = array_diagonal[is_indices[i]]; 1396 ierr = ISRestoreIndices(dirIS,(const PetscInt**)&is_indices);CHKERRQ(ierr); 1397 ierr = VecRestoreArrayRead(pcis->vec2_N,&array_diagonal);CHKERRQ(ierr); 1398 ierr = VecRestoreArray(pcis->vec1_N,&array_x);CHKERRQ(ierr); 1399 ierr = VecScatterBegin(matis->rctx,pcis->vec1_N,used_vec,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1400 ierr = VecScatterEnd(matis->rctx,pcis->vec1_N,used_vec,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1401 pcbddc->rhs_change = PETSC_TRUE; 1402 ierr = ISDestroy(&dirIS);CHKERRQ(ierr); 1403 } 1404 } 1405 1406 /* remove the computed solution or the initial guess from the rhs */ 1407 if (pcbddc->rhs_change || (ksp && pcbddc->ksp_guess_nonzero) ) { 1408 /* save the original rhs */ 1409 if (save_rhs) { 1410 ierr = VecSwap(rhs,pcbddc->original_rhs);CHKERRQ(ierr); 1411 save_rhs = PETSC_FALSE; 1412 } 1413 pcbddc->rhs_change = PETSC_TRUE; 1414 ierr = VecScale(used_vec,-1.0);CHKERRQ(ierr); 1415 ierr = MatMultAdd(pc->mat,used_vec,pcbddc->original_rhs,rhs);CHKERRQ(ierr); 1416 ierr = VecScale(used_vec,-1.0);CHKERRQ(ierr); 1417 ierr = VecCopy(used_vec,pcbddc->temp_solution);CHKERRQ(ierr); 1418 pcbddc->temp_solution_used = PETSC_TRUE; 1419 if (ksp) { 1420 ierr = KSPSetInitialGuessNonzero(ksp,PETSC_FALSE);CHKERRQ(ierr); 1421 } 1422 } 1423 ierr = VecDestroy(&used_vec);CHKERRQ(ierr); 1424 1425 /* compute initial vector in benign space if needed 1426 and remove non-benign solution from the rhs */ 1427 benign_correction_computed = PETSC_FALSE; 1428 if (rhs && pcbddc->benign_compute_correction && (pcbddc->benign_have_null || pcbddc->benign_apply_coarse_only)) { 1429 /* compute u^*_h using ideas similar to those in Xuemin Tu's PhD thesis (see Section 4.8.1) 1430 Recursively apply BDDC in the multilevel case */ 1431 if (!pcbddc->benign_vec) { 1432 ierr = VecDuplicate(rhs,&pcbddc->benign_vec);CHKERRQ(ierr); 1433 } 1434 /* keep applying coarse solver unless we no longer have benign subdomains */ 1435 pcbddc->benign_apply_coarse_only = pcbddc->benign_have_null ? PETSC_TRUE : PETSC_FALSE; 1436 if (!pcbddc->benign_skip_correction) { 1437 ierr = PCApply_BDDC(pc,rhs,pcbddc->benign_vec);CHKERRQ(ierr); 1438 benign_correction_computed = PETSC_TRUE; 1439 if (pcbddc->temp_solution_used) { 1440 ierr = VecAXPY(pcbddc->temp_solution,1.0,pcbddc->benign_vec);CHKERRQ(ierr); 1441 } 1442 ierr = VecScale(pcbddc->benign_vec,-1.0);CHKERRQ(ierr); 1443 /* store the original rhs if not done earlier */ 1444 if (save_rhs) { 1445 ierr = VecSwap(rhs,pcbddc->original_rhs);CHKERRQ(ierr); 1446 } 1447 if (pcbddc->rhs_change) { 1448 ierr = MatMultAdd(pc->mat,pcbddc->benign_vec,rhs,rhs);CHKERRQ(ierr); 1449 } else { 1450 ierr = MatMultAdd(pc->mat,pcbddc->benign_vec,pcbddc->original_rhs,rhs);CHKERRQ(ierr); 1451 } 1452 pcbddc->rhs_change = PETSC_TRUE; 1453 } 1454 pcbddc->benign_apply_coarse_only = PETSC_FALSE; 1455 } 1456 1457 /* dbg output */ 1458 if (pcbddc->dbg_flag && benign_correction_computed) { 1459 Vec v; 1460 1461 ierr = VecDuplicate(pcis->vec1_global,&v);CHKERRQ(ierr); 1462 if (pcbddc->ChangeOfBasisMatrix) { 1463 ierr = MatMultTranspose(pcbddc->ChangeOfBasisMatrix,rhs,v);CHKERRQ(ierr); 1464 } else { 1465 ierr = VecCopy(rhs,v);CHKERRQ(ierr); 1466 } 1467 ierr = PCBDDCBenignGetOrSetP0(pc,v,PETSC_TRUE);CHKERRQ(ierr); 1468 ierr = PetscViewerASCIIPrintf(pcbddc->dbg_viewer,"LEVEL %D: is the correction benign?\n",pcbddc->current_level);CHKERRQ(ierr); 1469 ierr = PetscScalarView(pcbddc->benign_n,pcbddc->benign_p0,pcbddc->dbg_viewer);CHKERRQ(ierr); 1470 ierr = PetscViewerFlush(pcbddc->dbg_viewer);CHKERRQ(ierr); 1471 ierr = VecDestroy(&v);CHKERRQ(ierr); 1472 } 1473 1474 /* set initial guess if using PCG */ 1475 pcbddc->exact_dirichlet_trick_app = PETSC_FALSE; 1476 if (x && pcbddc->use_exact_dirichlet_trick) { 1477 ierr = VecSet(x,0.0);CHKERRQ(ierr); 1478 if (pcbddc->ChangeOfBasisMatrix && pcbddc->change_interior) { 1479 if (benign_correction_computed) { /* we have already saved the changed rhs */ 1480 ierr = VecLockPop(pcis->vec1_global);CHKERRQ(ierr); 1481 } else { 1482 ierr = MatMultTranspose(pcbddc->ChangeOfBasisMatrix,rhs,pcis->vec1_global);CHKERRQ(ierr); 1483 } 1484 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec1_global,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1485 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec1_global,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1486 } else { 1487 ierr = VecScatterBegin(pcis->global_to_D,rhs,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1488 ierr = VecScatterEnd(pcis->global_to_D,rhs,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1489 } 1490 ierr = KSPSolve(pcbddc->ksp_D,pcis->vec1_D,pcis->vec2_D);CHKERRQ(ierr); 1491 if (pcbddc->ChangeOfBasisMatrix && pcbddc->change_interior) { 1492 ierr = VecSet(pcis->vec1_global,0.);CHKERRQ(ierr); 1493 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec2_D,pcis->vec1_global,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1494 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec2_D,pcis->vec1_global,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1495 ierr = MatMult(pcbddc->ChangeOfBasisMatrix,pcis->vec1_global,x);CHKERRQ(ierr); 1496 } else { 1497 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec2_D,x,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1498 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec2_D,x,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1499 } 1500 if (ksp) { 1501 ierr = KSPSetInitialGuessNonzero(ksp,PETSC_TRUE);CHKERRQ(ierr); 1502 } 1503 pcbddc->exact_dirichlet_trick_app = PETSC_TRUE; 1504 } else if (pcbddc->ChangeOfBasisMatrix && pcbddc->change_interior && benign_correction_computed && pcbddc->use_exact_dirichlet_trick) { 1505 ierr = VecLockPop(pcis->vec1_global);CHKERRQ(ierr); 1506 } 1507 PetscFunctionReturn(0); 1508 } 1509 1510 /* 1511 PCPostSolve_BDDC - Changes the computed solution if a transformation of basis 1512 approach has been selected. Also, restores rhs to its original state. 1513 1514 Input Parameter: 1515 + pc - the preconditioner contex 1516 1517 Application Interface Routine: PCPostSolve() 1518 1519 Notes: 1520 The interface routine PCPostSolve() is not usually called directly by 1521 the user, but instead is called by KSPSolve(). 1522 */ 1523 static PetscErrorCode PCPostSolve_BDDC(PC pc, KSP ksp, Vec rhs, Vec x) 1524 { 1525 PetscErrorCode ierr; 1526 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 1527 1528 PetscFunctionBegin; 1529 /* add solution removed in presolve */ 1530 if (x && pcbddc->rhs_change) { 1531 if (pcbddc->temp_solution_used) { 1532 ierr = VecAXPY(x,1.0,pcbddc->temp_solution);CHKERRQ(ierr); 1533 } else if (pcbddc->benign_compute_correction && pcbddc->benign_vec) { 1534 ierr = VecAXPY(x,-1.0,pcbddc->benign_vec);CHKERRQ(ierr); 1535 } 1536 /* restore to original state (not for FETI-DP) */ 1537 if (ksp) pcbddc->temp_solution_used = PETSC_FALSE; 1538 } 1539 1540 /* restore rhs to its original state (not needed for FETI-DP) */ 1541 if (rhs && pcbddc->rhs_change) { 1542 ierr = VecSwap(rhs,pcbddc->original_rhs);CHKERRQ(ierr); 1543 pcbddc->rhs_change = PETSC_FALSE; 1544 } 1545 /* restore ksp guess state */ 1546 if (ksp) { 1547 ierr = KSPSetInitialGuessNonzero(ksp,pcbddc->ksp_guess_nonzero);CHKERRQ(ierr); 1548 /* reset flag for exact dirichlet trick */ 1549 pcbddc->exact_dirichlet_trick_app = PETSC_FALSE; 1550 } 1551 PetscFunctionReturn(0); 1552 } 1553 1554 /* 1555 PCSetUp_BDDC - Prepares for the use of the BDDC preconditioner 1556 by setting data structures and options. 1557 1558 Input Parameter: 1559 + pc - the preconditioner context 1560 1561 Application Interface Routine: PCSetUp() 1562 1563 Notes: 1564 The interface routine PCSetUp() is not usually called directly by 1565 the user, but instead is called by PCApply() if necessary. 1566 */ 1567 PetscErrorCode PCSetUp_BDDC(PC pc) 1568 { 1569 PC_BDDC* pcbddc = (PC_BDDC*)pc->data; 1570 PCBDDCSubSchurs sub_schurs; 1571 Mat_IS* matis; 1572 MatNullSpace nearnullspace; 1573 Mat lA; 1574 IS lP,zerodiag = NULL; 1575 PetscInt nrows,ncols; 1576 PetscMPIInt size; 1577 PetscBool computesubschurs; 1578 PetscBool computeconstraintsmatrix; 1579 PetscBool new_nearnullspace_provided,ismatis,rl; 1580 PetscErrorCode ierr; 1581 1582 PetscFunctionBegin; 1583 ierr = PetscObjectTypeCompare((PetscObject)pc->pmat,MATIS,&ismatis);CHKERRQ(ierr); 1584 if (!ismatis) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONG,"PCBDDC preconditioner requires matrix of type MATIS"); 1585 ierr = MatGetSize(pc->pmat,&nrows,&ncols);CHKERRQ(ierr); 1586 if (nrows != ncols) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"PCBDDC preconditioner requires a square preconditioning matrix"); 1587 ierr = MPI_Comm_size(PetscObjectComm((PetscObject)pc),&size);CHKERRQ(ierr); 1588 1589 matis = (Mat_IS*)pc->pmat->data; 1590 /* the following lines of code should be replaced by a better logic between PCIS, PCNN, PCBDDC and other future nonoverlapping preconditioners */ 1591 /* For BDDC we need to define a local "Neumann" problem different to that defined in PCISSetup 1592 Also, BDDC builds its own KSP for the Dirichlet problem */ 1593 rl = pcbddc->recompute_topography; 1594 if (!pc->setupcalled || pc->flag == DIFFERENT_NONZERO_PATTERN) rl = PETSC_TRUE; 1595 ierr = MPIU_Allreduce(&rl,&pcbddc->recompute_topography,1,MPIU_BOOL,MPI_LOR,PetscObjectComm((PetscObject)pc));CHKERRQ(ierr); 1596 if (pcbddc->recompute_topography) { 1597 pcbddc->graphanalyzed = PETSC_FALSE; 1598 computeconstraintsmatrix = PETSC_TRUE; 1599 } else { 1600 computeconstraintsmatrix = PETSC_FALSE; 1601 } 1602 1603 /* check parameters' compatibility */ 1604 if (!pcbddc->use_deluxe_scaling) pcbddc->deluxe_zerorows = PETSC_FALSE; 1605 pcbddc->adaptive_selection = (PetscBool)(pcbddc->adaptive_threshold[0] != 0.0 || pcbddc->adaptive_threshold[1] != 0.0); 1606 pcbddc->use_deluxe_scaling = (PetscBool)(pcbddc->use_deluxe_scaling && size > 1); 1607 pcbddc->adaptive_selection = (PetscBool)(pcbddc->adaptive_selection && size > 1); 1608 pcbddc->adaptive_userdefined = (PetscBool)(pcbddc->adaptive_selection && pcbddc->adaptive_userdefined); 1609 if (pcbddc->adaptive_selection) pcbddc->use_faces = PETSC_TRUE; 1610 1611 computesubschurs = (PetscBool)(pcbddc->adaptive_selection || pcbddc->use_deluxe_scaling); 1612 if (pcbddc->switch_static) { 1613 PetscBool ismatis; 1614 1615 ierr = PetscObjectTypeCompare((PetscObject)pc->mat,MATIS,&ismatis);CHKERRQ(ierr); 1616 if (!ismatis) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"When the static switch is one, the iteration matrix should be of type MATIS"); 1617 } 1618 1619 /* activate all connected components if the netflux has been requested */ 1620 if (pcbddc->compute_nonetflux) { 1621 pcbddc->use_vertices = PETSC_TRUE; 1622 pcbddc->use_edges = PETSC_TRUE; 1623 pcbddc->use_faces = PETSC_TRUE; 1624 } 1625 1626 /* Get stdout for dbg */ 1627 if (pcbddc->dbg_flag) { 1628 if (!pcbddc->dbg_viewer) { 1629 pcbddc->dbg_viewer = PETSC_VIEWER_STDOUT_(PetscObjectComm((PetscObject)pc)); 1630 } 1631 ierr = PetscViewerASCIIPushSynchronized(pcbddc->dbg_viewer);CHKERRQ(ierr); 1632 ierr = PetscViewerASCIIAddTab(pcbddc->dbg_viewer,2*pcbddc->current_level);CHKERRQ(ierr); 1633 } 1634 1635 /* process topology information */ 1636 ierr = PetscLogEventBegin(PC_BDDC_Topology[pcbddc->current_level],pc,0,0,0);CHKERRQ(ierr); 1637 if (pcbddc->recompute_topography) { 1638 ierr = PCBDDCComputeLocalTopologyInfo(pc);CHKERRQ(ierr); 1639 if (pcbddc->discretegradient) { 1640 ierr = PCBDDCNedelecSupport(pc);CHKERRQ(ierr); 1641 } 1642 } 1643 1644 /* change basis if requested by the user */ 1645 if (pcbddc->user_ChangeOfBasisMatrix) { 1646 /* use_change_of_basis flag is used to automatically compute a change of basis from constraints */ 1647 pcbddc->use_change_of_basis = PETSC_FALSE; 1648 ierr = PCBDDCComputeLocalMatrix(pc,pcbddc->user_ChangeOfBasisMatrix);CHKERRQ(ierr); 1649 } else { 1650 ierr = MatDestroy(&pcbddc->local_mat);CHKERRQ(ierr); 1651 ierr = PetscObjectReference((PetscObject)matis->A);CHKERRQ(ierr); 1652 pcbddc->local_mat = matis->A; 1653 } 1654 1655 /* 1656 Compute change of basis on local pressures (aka zerodiag dofs) with the benign trick 1657 This should come earlier then PCISSetUp for extracting the correct subdomain matrices 1658 */ 1659 ierr = PCBDDCBenignShellMat(pc,PETSC_TRUE);CHKERRQ(ierr); 1660 if (pcbddc->benign_saddle_point) { 1661 PC_IS* pcis = (PC_IS*)pc->data; 1662 1663 if (pcbddc->user_ChangeOfBasisMatrix || pcbddc->use_change_of_basis || !computesubschurs) pcbddc->benign_change_explicit = PETSC_TRUE; 1664 /* detect local saddle point and change the basis in pcbddc->local_mat */ 1665 ierr = PCBDDCBenignDetectSaddlePoint(pc,(PetscBool)(!pcbddc->recompute_topography),&zerodiag);CHKERRQ(ierr); 1666 /* pop B0 mat from local mat */ 1667 ierr = PCBDDCBenignPopOrPushB0(pc,PETSC_TRUE);CHKERRQ(ierr); 1668 /* give pcis a hint to not reuse submatrices during PCISCreate */ 1669 if (pc->flag == SAME_NONZERO_PATTERN && pcis->reusesubmatrices == PETSC_TRUE) { 1670 if (pcbddc->benign_n && (pcbddc->benign_change_explicit || pcbddc->dbg_flag)) { 1671 pcis->reusesubmatrices = PETSC_FALSE; 1672 } else { 1673 pcis->reusesubmatrices = PETSC_TRUE; 1674 } 1675 } else { 1676 pcis->reusesubmatrices = PETSC_FALSE; 1677 } 1678 } 1679 1680 /* propagate relevant information */ 1681 if (matis->A->symmetric_set) { 1682 ierr = MatSetOption(pcbddc->local_mat,MAT_SYMMETRIC,matis->A->symmetric);CHKERRQ(ierr); 1683 } 1684 if (matis->A->spd_set) { 1685 ierr = MatSetOption(pcbddc->local_mat,MAT_SPD,matis->A->spd);CHKERRQ(ierr); 1686 } 1687 1688 /* Set up all the "iterative substructuring" common block without computing solvers */ 1689 { 1690 Mat temp_mat; 1691 1692 temp_mat = matis->A; 1693 matis->A = pcbddc->local_mat; 1694 ierr = PCISSetUp(pc,PETSC_TRUE,PETSC_FALSE);CHKERRQ(ierr); 1695 pcbddc->local_mat = matis->A; 1696 matis->A = temp_mat; 1697 } 1698 1699 /* Analyze interface */ 1700 if (!pcbddc->graphanalyzed) { 1701 ierr = PCBDDCAnalyzeInterface(pc);CHKERRQ(ierr); 1702 computeconstraintsmatrix = PETSC_TRUE; 1703 if (pcbddc->adaptive_selection && !pcbddc->use_deluxe_scaling && !pcbddc->mat_graph->twodim) { 1704 SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Cannot compute the adaptive primal space for a problem with 3D edges without deluxe scaling"); 1705 } 1706 if (pcbddc->compute_nonetflux) { 1707 MatNullSpace nnfnnsp; 1708 1709 if (!pcbddc->divudotp) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Missing divudotp operator"); 1710 ierr = PCBDDCComputeNoNetFlux(pc->pmat,pcbddc->divudotp,pcbddc->divudotp_trans,pcbddc->divudotp_vl2l,pcbddc->mat_graph,&nnfnnsp);CHKERRQ(ierr); 1711 /* TODO what if a nearnullspace is already attached? */ 1712 if (nnfnnsp) { 1713 ierr = MatSetNearNullSpace(pc->pmat,nnfnnsp);CHKERRQ(ierr); 1714 ierr = MatNullSpaceDestroy(&nnfnnsp);CHKERRQ(ierr); 1715 } 1716 } 1717 } 1718 ierr = PetscLogEventEnd(PC_BDDC_Topology[pcbddc->current_level],pc,0,0,0);CHKERRQ(ierr); 1719 1720 /* check existence of a divergence free extension, i.e. 1721 b(v_I,p_0) = 0 for all v_I (raise error if not). 1722 Also, check that PCBDDCBenignGetOrSetP0 works */ 1723 if (pcbddc->benign_saddle_point && pcbddc->dbg_flag > 1) { 1724 ierr = PCBDDCBenignCheck(pc,zerodiag);CHKERRQ(ierr); 1725 } 1726 ierr = ISDestroy(&zerodiag);CHKERRQ(ierr); 1727 1728 /* Setup local dirichlet solver ksp_D and sub_schurs solvers */ 1729 if (computesubschurs && pcbddc->recompute_topography) { 1730 ierr = PCBDDCInitSubSchurs(pc);CHKERRQ(ierr); 1731 } 1732 /* SetUp Scaling operator (scaling matrices could be needed in SubSchursSetUp)*/ 1733 if (!pcbddc->use_deluxe_scaling) { 1734 ierr = PCBDDCScalingSetUp(pc);CHKERRQ(ierr); 1735 } 1736 1737 /* finish setup solvers and do adaptive selection of constraints */ 1738 sub_schurs = pcbddc->sub_schurs; 1739 if (sub_schurs && sub_schurs->schur_explicit) { 1740 if (computesubschurs) { 1741 ierr = PCBDDCSetUpSubSchurs(pc);CHKERRQ(ierr); 1742 } 1743 ierr = PCBDDCSetUpLocalSolvers(pc,PETSC_TRUE,PETSC_FALSE);CHKERRQ(ierr); 1744 } else { 1745 ierr = PCBDDCSetUpLocalSolvers(pc,PETSC_TRUE,PETSC_FALSE);CHKERRQ(ierr); 1746 if (computesubschurs) { 1747 ierr = PCBDDCSetUpSubSchurs(pc);CHKERRQ(ierr); 1748 } 1749 } 1750 if (pcbddc->adaptive_selection) { 1751 ierr = PCBDDCAdaptiveSelection(pc);CHKERRQ(ierr); 1752 computeconstraintsmatrix = PETSC_TRUE; 1753 } 1754 1755 /* infer if NullSpace object attached to Mat via MatSetNearNullSpace has changed */ 1756 new_nearnullspace_provided = PETSC_FALSE; 1757 ierr = MatGetNearNullSpace(pc->pmat,&nearnullspace);CHKERRQ(ierr); 1758 if (pcbddc->onearnullspace) { /* already used nearnullspace */ 1759 if (!nearnullspace) { /* near null space attached to mat has been destroyed */ 1760 new_nearnullspace_provided = PETSC_TRUE; 1761 } else { 1762 /* determine if the two nullspaces are different (should be lightweight) */ 1763 if (nearnullspace != pcbddc->onearnullspace) { 1764 new_nearnullspace_provided = PETSC_TRUE; 1765 } else { /* maybe the user has changed the content of the nearnullspace so check vectors ObjectStateId */ 1766 PetscInt i; 1767 const Vec *nearnullvecs; 1768 PetscObjectState state; 1769 PetscInt nnsp_size; 1770 ierr = MatNullSpaceGetVecs(nearnullspace,NULL,&nnsp_size,&nearnullvecs);CHKERRQ(ierr); 1771 for (i=0;i<nnsp_size;i++) { 1772 ierr = PetscObjectStateGet((PetscObject)nearnullvecs[i],&state);CHKERRQ(ierr); 1773 if (pcbddc->onearnullvecs_state[i] != state) { 1774 new_nearnullspace_provided = PETSC_TRUE; 1775 break; 1776 } 1777 } 1778 } 1779 } 1780 } else { 1781 if (!nearnullspace) { /* both nearnullspaces are null */ 1782 new_nearnullspace_provided = PETSC_FALSE; 1783 } else { /* nearnullspace attached later */ 1784 new_nearnullspace_provided = PETSC_TRUE; 1785 } 1786 } 1787 1788 /* Setup constraints and related work vectors */ 1789 /* reset primal space flags */ 1790 ierr = PetscLogEventBegin(PC_BDDC_LocalWork[pcbddc->current_level],pc,0,0,0);CHKERRQ(ierr); 1791 pcbddc->new_primal_space = PETSC_FALSE; 1792 pcbddc->new_primal_space_local = PETSC_FALSE; 1793 if (computeconstraintsmatrix || new_nearnullspace_provided) { 1794 /* It also sets the primal space flags */ 1795 ierr = PCBDDCConstraintsSetUp(pc);CHKERRQ(ierr); 1796 } 1797 /* Allocate needed local vectors (which depends on quantities defined during ConstraintsSetUp) */ 1798 ierr = PCBDDCSetUpLocalWorkVectors(pc);CHKERRQ(ierr); 1799 1800 if (pcbddc->use_change_of_basis) { 1801 PC_IS *pcis = (PC_IS*)(pc->data); 1802 1803 ierr = PCBDDCComputeLocalMatrix(pc,pcbddc->ChangeOfBasisMatrix);CHKERRQ(ierr); 1804 if (pcbddc->benign_change) { 1805 ierr = MatDestroy(&pcbddc->benign_B0);CHKERRQ(ierr); 1806 /* pop B0 from pcbddc->local_mat */ 1807 ierr = PCBDDCBenignPopOrPushB0(pc,PETSC_TRUE);CHKERRQ(ierr); 1808 } 1809 /* get submatrices */ 1810 ierr = MatDestroy(&pcis->A_IB);CHKERRQ(ierr); 1811 ierr = MatDestroy(&pcis->A_BI);CHKERRQ(ierr); 1812 ierr = MatDestroy(&pcis->A_BB);CHKERRQ(ierr); 1813 ierr = MatCreateSubMatrix(pcbddc->local_mat,pcis->is_B_local,pcis->is_B_local,MAT_INITIAL_MATRIX,&pcis->A_BB);CHKERRQ(ierr); 1814 ierr = MatCreateSubMatrix(pcbddc->local_mat,pcis->is_I_local,pcis->is_B_local,MAT_INITIAL_MATRIX,&pcis->A_IB);CHKERRQ(ierr); 1815 ierr = MatCreateSubMatrix(pcbddc->local_mat,pcis->is_B_local,pcis->is_I_local,MAT_INITIAL_MATRIX,&pcis->A_BI);CHKERRQ(ierr); 1816 /* set flag in pcis to not reuse submatrices during PCISCreate */ 1817 pcis->reusesubmatrices = PETSC_FALSE; 1818 } else if (!pcbddc->user_ChangeOfBasisMatrix && !pcbddc->benign_change) { 1819 ierr = MatDestroy(&pcbddc->local_mat);CHKERRQ(ierr); 1820 ierr = PetscObjectReference((PetscObject)matis->A);CHKERRQ(ierr); 1821 pcbddc->local_mat = matis->A; 1822 } 1823 1824 /* interface pressure block row for B_C */ 1825 ierr = PetscObjectQuery((PetscObject)pc,"__KSPFETIDP_lP" ,(PetscObject*)&lP);CHKERRQ(ierr); 1826 ierr = PetscObjectQuery((PetscObject)pc,"__KSPFETIDP_lA" ,(PetscObject*)&lA);CHKERRQ(ierr); 1827 if (lA && lP) { 1828 PC_IS* pcis = (PC_IS*)pc->data; 1829 Mat B_BI,B_BB,Bt_BI,Bt_BB; 1830 PetscBool issym; 1831 ierr = MatIsSymmetric(lA,PETSC_SMALL,&issym);CHKERRQ(ierr); 1832 if (issym) { 1833 ierr = MatCreateSubMatrix(lA,lP,pcis->is_I_local,MAT_INITIAL_MATRIX,&B_BI);CHKERRQ(ierr); 1834 ierr = MatCreateSubMatrix(lA,lP,pcis->is_B_local,MAT_INITIAL_MATRIX,&B_BB);CHKERRQ(ierr); 1835 ierr = MatCreateTranspose(B_BI,&Bt_BI);CHKERRQ(ierr); 1836 ierr = MatCreateTranspose(B_BB,&Bt_BB);CHKERRQ(ierr); 1837 } else { 1838 ierr = MatCreateSubMatrix(lA,lP,pcis->is_I_local,MAT_INITIAL_MATRIX,&B_BI);CHKERRQ(ierr); 1839 ierr = MatCreateSubMatrix(lA,lP,pcis->is_B_local,MAT_INITIAL_MATRIX,&B_BB);CHKERRQ(ierr); 1840 ierr = MatCreateSubMatrix(lA,pcis->is_I_local,lP,MAT_INITIAL_MATRIX,&Bt_BI);CHKERRQ(ierr); 1841 ierr = MatCreateSubMatrix(lA,pcis->is_B_local,lP,MAT_INITIAL_MATRIX,&Bt_BB);CHKERRQ(ierr); 1842 } 1843 ierr = PetscObjectCompose((PetscObject)pc,"__KSPFETIDP_B_BI",(PetscObject)B_BI);CHKERRQ(ierr); 1844 ierr = PetscObjectCompose((PetscObject)pc,"__KSPFETIDP_B_BB",(PetscObject)B_BB);CHKERRQ(ierr); 1845 ierr = PetscObjectCompose((PetscObject)pc,"__KSPFETIDP_Bt_BI",(PetscObject)Bt_BI);CHKERRQ(ierr); 1846 ierr = PetscObjectCompose((PetscObject)pc,"__KSPFETIDP_Bt_BB",(PetscObject)Bt_BB);CHKERRQ(ierr); 1847 ierr = MatDestroy(&B_BI);CHKERRQ(ierr); 1848 ierr = MatDestroy(&B_BB);CHKERRQ(ierr); 1849 ierr = MatDestroy(&Bt_BI);CHKERRQ(ierr); 1850 ierr = MatDestroy(&Bt_BB);CHKERRQ(ierr); 1851 } 1852 ierr = PetscLogEventEnd(PC_BDDC_LocalWork[pcbddc->current_level],pc,0,0,0);CHKERRQ(ierr); 1853 1854 /* SetUp coarse and local Neumann solvers */ 1855 ierr = PCBDDCSetUpSolvers(pc);CHKERRQ(ierr); 1856 /* SetUp Scaling operator */ 1857 if (pcbddc->use_deluxe_scaling) { 1858 ierr = PCBDDCScalingSetUp(pc);CHKERRQ(ierr); 1859 } 1860 1861 /* mark topography as done */ 1862 pcbddc->recompute_topography = PETSC_FALSE; 1863 1864 /* wrap pcis->A_IB and pcis->A_BI if we did not change explicitly the variables on the pressures */ 1865 ierr = PCBDDCBenignShellMat(pc,PETSC_FALSE);CHKERRQ(ierr); 1866 1867 if (pcbddc->dbg_flag) { 1868 ierr = PetscViewerASCIISubtractTab(pcbddc->dbg_viewer,2*pcbddc->current_level);CHKERRQ(ierr); 1869 ierr = PetscViewerASCIIPopSynchronized(pcbddc->dbg_viewer);CHKERRQ(ierr); 1870 } 1871 PetscFunctionReturn(0); 1872 } 1873 1874 /* 1875 PCApply_BDDC - Applies the BDDC operator to a vector. 1876 1877 Input Parameters: 1878 + pc - the preconditioner context 1879 - r - input vector (global) 1880 1881 Output Parameter: 1882 . z - output vector (global) 1883 1884 Application Interface Routine: PCApply() 1885 */ 1886 PetscErrorCode PCApply_BDDC(PC pc,Vec r,Vec z) 1887 { 1888 PC_IS *pcis = (PC_IS*)(pc->data); 1889 PC_BDDC *pcbddc = (PC_BDDC*)(pc->data); 1890 PetscInt n_B = pcis->n_B, n_D = pcis->n - n_B; 1891 PetscErrorCode ierr; 1892 const PetscScalar one = 1.0; 1893 const PetscScalar m_one = -1.0; 1894 const PetscScalar zero = 0.0; 1895 1896 /* This code is similar to that provided in nn.c for PCNN 1897 NN interface preconditioner changed to BDDC 1898 Added support for M_3 preconditioner in the reference article (code is active if pcbddc->switch_static == PETSC_TRUE) */ 1899 1900 PetscFunctionBegin; 1901 ierr = PetscCitationsRegister(citation,&cited);CHKERRQ(ierr); 1902 if (pcbddc->ChangeOfBasisMatrix) { 1903 Vec swap; 1904 1905 ierr = MatMultTranspose(pcbddc->ChangeOfBasisMatrix,r,pcbddc->work_change);CHKERRQ(ierr); 1906 swap = pcbddc->work_change; 1907 pcbddc->work_change = r; 1908 r = swap; 1909 /* save rhs so that we don't need to apply the change of basis for the exact dirichlet trick in PreSolve */ 1910 if (pcbddc->benign_apply_coarse_only && pcbddc->use_exact_dirichlet_trick && pcbddc->change_interior) { 1911 ierr = VecCopy(r,pcis->vec1_global);CHKERRQ(ierr); 1912 ierr = VecLockPush(pcis->vec1_global);CHKERRQ(ierr); 1913 } 1914 } 1915 if (pcbddc->benign_have_null) { /* get p0 from r */ 1916 ierr = PCBDDCBenignGetOrSetP0(pc,r,PETSC_TRUE);CHKERRQ(ierr); 1917 } 1918 if (!pcbddc->exact_dirichlet_trick_app && !pcbddc->benign_apply_coarse_only) { 1919 ierr = VecCopy(r,z);CHKERRQ(ierr); 1920 /* First Dirichlet solve */ 1921 ierr = VecScatterBegin(pcis->global_to_D,r,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1922 ierr = VecScatterEnd(pcis->global_to_D,r,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1923 /* 1924 Assembling right hand side for BDDC operator 1925 - pcis->vec1_D for the Dirichlet part (if needed, i.e. pcbddc->switch_static == PETSC_TRUE) 1926 - pcis->vec1_B the interface part of the global vector z 1927 */ 1928 if (n_D) { 1929 ierr = KSPSolve(pcbddc->ksp_D,pcis->vec1_D,pcis->vec2_D);CHKERRQ(ierr); 1930 ierr = VecScale(pcis->vec2_D,m_one);CHKERRQ(ierr); 1931 if (pcbddc->switch_static) { 1932 Mat_IS *matis = (Mat_IS*)(pc->mat->data); 1933 1934 ierr = VecSet(pcis->vec1_N,0.);CHKERRQ(ierr); 1935 ierr = VecScatterBegin(pcis->N_to_D,pcis->vec2_D,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1936 ierr = VecScatterEnd(pcis->N_to_D,pcis->vec2_D,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1937 if (!pcbddc->switch_static_change) { 1938 ierr = MatMult(matis->A,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 1939 } else { 1940 ierr = MatMult(pcbddc->switch_static_change,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 1941 ierr = MatMult(matis->A,pcis->vec2_N,pcis->vec1_N);CHKERRQ(ierr); 1942 ierr = MatMultTranspose(pcbddc->switch_static_change,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 1943 } 1944 ierr = VecScatterBegin(pcis->N_to_D,pcis->vec2_N,pcis->vec1_D,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1945 ierr = VecScatterEnd(pcis->N_to_D,pcis->vec2_N,pcis->vec1_D,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1946 ierr = VecScatterBegin(pcis->N_to_B,pcis->vec2_N,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1947 ierr = VecScatterEnd(pcis->N_to_B,pcis->vec2_N,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1948 } else { 1949 ierr = MatMult(pcis->A_BI,pcis->vec2_D,pcis->vec1_B);CHKERRQ(ierr); 1950 } 1951 } else { 1952 ierr = VecSet(pcis->vec1_B,zero);CHKERRQ(ierr); 1953 } 1954 ierr = VecScatterBegin(pcis->global_to_B,pcis->vec1_B,z,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1955 ierr = VecScatterEnd(pcis->global_to_B,pcis->vec1_B,z,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1956 ierr = PCBDDCScalingRestriction(pc,z,pcis->vec1_B);CHKERRQ(ierr); 1957 } else { 1958 if (!pcbddc->benign_apply_coarse_only) { 1959 ierr = PCBDDCScalingRestriction(pc,r,pcis->vec1_B);CHKERRQ(ierr); 1960 } 1961 } 1962 1963 /* Apply interface preconditioner 1964 input/output vecs: pcis->vec1_B and pcis->vec1_D */ 1965 ierr = PCBDDCApplyInterfacePreconditioner(pc,PETSC_FALSE);CHKERRQ(ierr); 1966 1967 /* Apply transpose of partition of unity operator */ 1968 ierr = PCBDDCScalingExtension(pc,pcis->vec1_B,z);CHKERRQ(ierr); 1969 1970 /* Second Dirichlet solve and assembling of output */ 1971 ierr = VecScatterBegin(pcis->global_to_B,z,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1972 ierr = VecScatterEnd(pcis->global_to_B,z,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1973 if (n_B) { 1974 if (pcbddc->switch_static) { 1975 Mat_IS *matis = (Mat_IS*)(pc->mat->data); 1976 1977 ierr = VecScatterBegin(pcis->N_to_D,pcis->vec1_D,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1978 ierr = VecScatterEnd(pcis->N_to_D,pcis->vec1_D,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1979 ierr = VecScatterBegin(pcis->N_to_B,pcis->vec1_B,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1980 ierr = VecScatterEnd(pcis->N_to_B,pcis->vec1_B,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1981 if (!pcbddc->switch_static_change) { 1982 ierr = MatMult(matis->A,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 1983 } else { 1984 ierr = MatMult(pcbddc->switch_static_change,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 1985 ierr = MatMult(matis->A,pcis->vec2_N,pcis->vec1_N);CHKERRQ(ierr); 1986 ierr = MatMultTranspose(pcbddc->switch_static_change,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 1987 } 1988 ierr = VecScatterBegin(pcis->N_to_D,pcis->vec2_N,pcis->vec3_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1989 ierr = VecScatterEnd(pcis->N_to_D,pcis->vec2_N,pcis->vec3_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1990 } else { 1991 ierr = MatMult(pcis->A_IB,pcis->vec1_B,pcis->vec3_D);CHKERRQ(ierr); 1992 } 1993 } else if (pcbddc->switch_static) { /* n_B is zero */ 1994 Mat_IS *matis = (Mat_IS*)(pc->mat->data); 1995 1996 if (!pcbddc->switch_static_change) { 1997 ierr = MatMult(matis->A,pcis->vec1_D,pcis->vec3_D);CHKERRQ(ierr); 1998 } else { 1999 ierr = MatMult(pcbddc->switch_static_change,pcis->vec1_D,pcis->vec1_N);CHKERRQ(ierr); 2000 ierr = MatMult(matis->A,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 2001 ierr = MatMultTranspose(pcbddc->switch_static_change,pcis->vec2_N,pcis->vec3_D);CHKERRQ(ierr); 2002 } 2003 } 2004 ierr = KSPSolve(pcbddc->ksp_D,pcis->vec3_D,pcis->vec4_D);CHKERRQ(ierr); 2005 2006 if (!pcbddc->exact_dirichlet_trick_app && !pcbddc->benign_apply_coarse_only) { 2007 if (pcbddc->switch_static) { 2008 ierr = VecAXPBYPCZ(pcis->vec2_D,m_one,one,m_one,pcis->vec4_D,pcis->vec1_D);CHKERRQ(ierr); 2009 } else { 2010 ierr = VecAXPBY(pcis->vec2_D,m_one,m_one,pcis->vec4_D);CHKERRQ(ierr); 2011 } 2012 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec2_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2013 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec2_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2014 } else { 2015 if (pcbddc->switch_static) { 2016 ierr = VecAXPBY(pcis->vec4_D,one,m_one,pcis->vec1_D);CHKERRQ(ierr); 2017 } else { 2018 ierr = VecScale(pcis->vec4_D,m_one);CHKERRQ(ierr); 2019 } 2020 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec4_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2021 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec4_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2022 } 2023 if (pcbddc->benign_have_null) { /* set p0 (computed in PCBDDCApplyInterface) */ 2024 if (pcbddc->benign_apply_coarse_only) { 2025 ierr = PetscMemzero(pcbddc->benign_p0,pcbddc->benign_n*sizeof(PetscScalar));CHKERRQ(ierr); 2026 } 2027 ierr = PCBDDCBenignGetOrSetP0(pc,z,PETSC_FALSE);CHKERRQ(ierr); 2028 } 2029 2030 if (pcbddc->ChangeOfBasisMatrix) { 2031 pcbddc->work_change = r; 2032 ierr = VecCopy(z,pcbddc->work_change);CHKERRQ(ierr); 2033 ierr = MatMult(pcbddc->ChangeOfBasisMatrix,pcbddc->work_change,z);CHKERRQ(ierr); 2034 } 2035 PetscFunctionReturn(0); 2036 } 2037 2038 /* 2039 PCApplyTranspose_BDDC - Applies the transpose of the BDDC operator to a vector. 2040 2041 Input Parameters: 2042 + pc - the preconditioner context 2043 - r - input vector (global) 2044 2045 Output Parameter: 2046 . z - output vector (global) 2047 2048 Application Interface Routine: PCApplyTranspose() 2049 */ 2050 PetscErrorCode PCApplyTranspose_BDDC(PC pc,Vec r,Vec z) 2051 { 2052 PC_IS *pcis = (PC_IS*)(pc->data); 2053 PC_BDDC *pcbddc = (PC_BDDC*)(pc->data); 2054 PetscInt n_B = pcis->n_B, n_D = pcis->n - n_B; 2055 PetscErrorCode ierr; 2056 const PetscScalar one = 1.0; 2057 const PetscScalar m_one = -1.0; 2058 const PetscScalar zero = 0.0; 2059 2060 PetscFunctionBegin; 2061 ierr = PetscCitationsRegister(citation,&cited);CHKERRQ(ierr); 2062 if (pcbddc->ChangeOfBasisMatrix) { 2063 Vec swap; 2064 2065 ierr = MatMultTranspose(pcbddc->ChangeOfBasisMatrix,r,pcbddc->work_change);CHKERRQ(ierr); 2066 swap = pcbddc->work_change; 2067 pcbddc->work_change = r; 2068 r = swap; 2069 /* save rhs so that we don't need to apply the change of basis for the exact dirichlet trick in PreSolve */ 2070 if (pcbddc->benign_apply_coarse_only && pcbddc->exact_dirichlet_trick_app && pcbddc->change_interior) { 2071 ierr = VecCopy(r,pcis->vec1_global);CHKERRQ(ierr); 2072 ierr = VecLockPush(pcis->vec1_global);CHKERRQ(ierr); 2073 } 2074 } 2075 if (pcbddc->benign_have_null) { /* get p0 from r */ 2076 ierr = PCBDDCBenignGetOrSetP0(pc,r,PETSC_TRUE);CHKERRQ(ierr); 2077 } 2078 if (!pcbddc->exact_dirichlet_trick_app && !pcbddc->benign_apply_coarse_only) { 2079 ierr = VecCopy(r,z);CHKERRQ(ierr); 2080 /* First Dirichlet solve */ 2081 ierr = VecScatterBegin(pcis->global_to_D,r,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2082 ierr = VecScatterEnd(pcis->global_to_D,r,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2083 /* 2084 Assembling right hand side for BDDC operator 2085 - pcis->vec1_D for the Dirichlet part (if needed, i.e. pcbddc->switch_static == PETSC_TRUE) 2086 - pcis->vec1_B the interface part of the global vector z 2087 */ 2088 if (n_D) { 2089 ierr = KSPSolveTranspose(pcbddc->ksp_D,pcis->vec1_D,pcis->vec2_D);CHKERRQ(ierr); 2090 ierr = VecScale(pcis->vec2_D,m_one);CHKERRQ(ierr); 2091 if (pcbddc->switch_static) { 2092 Mat_IS *matis = (Mat_IS*)(pc->mat->data); 2093 2094 ierr = VecSet(pcis->vec1_N,0.);CHKERRQ(ierr); 2095 ierr = VecScatterBegin(pcis->N_to_D,pcis->vec2_D,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2096 ierr = VecScatterEnd(pcis->N_to_D,pcis->vec2_D,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2097 if (!pcbddc->switch_static_change) { 2098 ierr = MatMultTranspose(matis->A,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 2099 } else { 2100 ierr = MatMult(pcbddc->switch_static_change,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 2101 ierr = MatMultTranspose(matis->A,pcis->vec2_N,pcis->vec1_N);CHKERRQ(ierr); 2102 ierr = MatMultTranspose(pcbddc->switch_static_change,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 2103 } 2104 ierr = VecScatterBegin(pcis->N_to_D,pcis->vec2_N,pcis->vec1_D,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2105 ierr = VecScatterEnd(pcis->N_to_D,pcis->vec2_N,pcis->vec1_D,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2106 ierr = VecScatterBegin(pcis->N_to_B,pcis->vec2_N,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2107 ierr = VecScatterEnd(pcis->N_to_B,pcis->vec2_N,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2108 } else { 2109 ierr = MatMultTranspose(pcis->A_IB,pcis->vec2_D,pcis->vec1_B);CHKERRQ(ierr); 2110 } 2111 } else { 2112 ierr = VecSet(pcis->vec1_B,zero);CHKERRQ(ierr); 2113 } 2114 ierr = VecScatterBegin(pcis->global_to_B,pcis->vec1_B,z,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2115 ierr = VecScatterEnd(pcis->global_to_B,pcis->vec1_B,z,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2116 ierr = PCBDDCScalingRestriction(pc,z,pcis->vec1_B);CHKERRQ(ierr); 2117 } else { 2118 ierr = PCBDDCScalingRestriction(pc,r,pcis->vec1_B);CHKERRQ(ierr); 2119 } 2120 2121 /* Apply interface preconditioner 2122 input/output vecs: pcis->vec1_B and pcis->vec1_D */ 2123 ierr = PCBDDCApplyInterfacePreconditioner(pc,PETSC_TRUE);CHKERRQ(ierr); 2124 2125 /* Apply transpose of partition of unity operator */ 2126 ierr = PCBDDCScalingExtension(pc,pcis->vec1_B,z);CHKERRQ(ierr); 2127 2128 /* Second Dirichlet solve and assembling of output */ 2129 ierr = VecScatterBegin(pcis->global_to_B,z,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2130 ierr = VecScatterEnd(pcis->global_to_B,z,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2131 if (n_B) { 2132 if (pcbddc->switch_static) { 2133 Mat_IS *matis = (Mat_IS*)(pc->mat->data); 2134 2135 ierr = VecScatterBegin(pcis->N_to_D,pcis->vec1_D,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2136 ierr = VecScatterEnd(pcis->N_to_D,pcis->vec1_D,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2137 ierr = VecScatterBegin(pcis->N_to_B,pcis->vec1_B,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2138 ierr = VecScatterEnd(pcis->N_to_B,pcis->vec1_B,pcis->vec1_N,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2139 if (!pcbddc->switch_static_change) { 2140 ierr = MatMultTranspose(matis->A,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 2141 } else { 2142 ierr = MatMult(pcbddc->switch_static_change,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 2143 ierr = MatMultTranspose(matis->A,pcis->vec2_N,pcis->vec1_N);CHKERRQ(ierr); 2144 ierr = MatMultTranspose(pcbddc->switch_static_change,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 2145 } 2146 ierr = VecScatterBegin(pcis->N_to_D,pcis->vec2_N,pcis->vec3_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2147 ierr = VecScatterEnd(pcis->N_to_D,pcis->vec2_N,pcis->vec3_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2148 } else { 2149 ierr = MatMultTranspose(pcis->A_BI,pcis->vec1_B,pcis->vec3_D);CHKERRQ(ierr); 2150 } 2151 } else if (pcbddc->switch_static) { /* n_B is zero */ 2152 Mat_IS *matis = (Mat_IS*)(pc->mat->data); 2153 2154 if (!pcbddc->switch_static_change) { 2155 ierr = MatMultTranspose(matis->A,pcis->vec1_D,pcis->vec3_D);CHKERRQ(ierr); 2156 } else { 2157 ierr = MatMult(pcbddc->switch_static_change,pcis->vec1_D,pcis->vec1_N);CHKERRQ(ierr); 2158 ierr = MatMultTranspose(matis->A,pcis->vec1_N,pcis->vec2_N);CHKERRQ(ierr); 2159 ierr = MatMultTranspose(pcbddc->switch_static_change,pcis->vec2_N,pcis->vec3_D);CHKERRQ(ierr); 2160 } 2161 } 2162 ierr = KSPSolveTranspose(pcbddc->ksp_D,pcis->vec3_D,pcis->vec4_D);CHKERRQ(ierr); 2163 if (!pcbddc->exact_dirichlet_trick_app && !pcbddc->benign_apply_coarse_only) { 2164 if (pcbddc->switch_static) { 2165 ierr = VecAXPBYPCZ(pcis->vec2_D,m_one,one,m_one,pcis->vec4_D,pcis->vec1_D);CHKERRQ(ierr); 2166 } else { 2167 ierr = VecAXPBY(pcis->vec2_D,m_one,m_one,pcis->vec4_D);CHKERRQ(ierr); 2168 } 2169 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec2_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2170 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec2_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2171 } else { 2172 if (pcbddc->switch_static) { 2173 ierr = VecAXPBY(pcis->vec4_D,one,m_one,pcis->vec1_D);CHKERRQ(ierr); 2174 } else { 2175 ierr = VecScale(pcis->vec4_D,m_one);CHKERRQ(ierr); 2176 } 2177 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec4_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2178 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec4_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2179 } 2180 if (pcbddc->benign_have_null) { /* set p0 (computed in PCBDDCApplyInterface) */ 2181 ierr = PCBDDCBenignGetOrSetP0(pc,z,PETSC_FALSE);CHKERRQ(ierr); 2182 } 2183 if (pcbddc->ChangeOfBasisMatrix) { 2184 pcbddc->work_change = r; 2185 ierr = VecCopy(z,pcbddc->work_change);CHKERRQ(ierr); 2186 ierr = MatMult(pcbddc->ChangeOfBasisMatrix,pcbddc->work_change,z);CHKERRQ(ierr); 2187 } 2188 PetscFunctionReturn(0); 2189 } 2190 2191 PetscErrorCode PCReset_BDDC(PC pc) 2192 { 2193 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 2194 PC_IS *pcis = (PC_IS*)pc->data; 2195 KSP kspD,kspR,kspC; 2196 PetscErrorCode ierr; 2197 2198 PetscFunctionBegin; 2199 /* free BDDC custom data */ 2200 ierr = PCBDDCResetCustomization(pc);CHKERRQ(ierr); 2201 /* destroy objects related to topography */ 2202 ierr = PCBDDCResetTopography(pc);CHKERRQ(ierr); 2203 /* destroy objects for scaling operator */ 2204 ierr = PCBDDCScalingDestroy(pc);CHKERRQ(ierr); 2205 /* free solvers stuff */ 2206 ierr = PCBDDCResetSolvers(pc);CHKERRQ(ierr); 2207 /* free global vectors needed in presolve */ 2208 ierr = VecDestroy(&pcbddc->temp_solution);CHKERRQ(ierr); 2209 ierr = VecDestroy(&pcbddc->original_rhs);CHKERRQ(ierr); 2210 /* free data created by PCIS */ 2211 ierr = PCISDestroy(pc);CHKERRQ(ierr); 2212 2213 /* restore defaults */ 2214 kspD = pcbddc->ksp_D; 2215 kspR = pcbddc->ksp_R; 2216 kspC = pcbddc->coarse_ksp; 2217 ierr = PetscMemzero(pc->data,sizeof(*pcbddc));CHKERRQ(ierr); 2218 pcis->n_neigh = -1; 2219 pcis->scaling_factor = 1.0; 2220 pcis->reusesubmatrices = PETSC_TRUE; 2221 pcbddc->use_local_adj = PETSC_TRUE; 2222 pcbddc->use_vertices = PETSC_TRUE; 2223 pcbddc->use_edges = PETSC_TRUE; 2224 pcbddc->symmetric_primal = PETSC_TRUE; 2225 pcbddc->vertex_size = 1; 2226 pcbddc->recompute_topography = PETSC_TRUE; 2227 pcbddc->coarse_size = -1; 2228 pcbddc->use_exact_dirichlet_trick = PETSC_TRUE; 2229 pcbddc->coarsening_ratio = 8; 2230 pcbddc->coarse_eqs_per_proc = 1; 2231 pcbddc->benign_compute_correction = PETSC_TRUE; 2232 pcbddc->nedfield = -1; 2233 pcbddc->nedglobal = PETSC_TRUE; 2234 pcbddc->graphmaxcount = PETSC_MAX_INT; 2235 pcbddc->sub_schurs_layers = -1; 2236 pcbddc->ksp_D = kspD; 2237 pcbddc->ksp_R = kspR; 2238 pcbddc->coarse_ksp = kspC; 2239 PetscFunctionReturn(0); 2240 } 2241 2242 PetscErrorCode PCDestroy_BDDC(PC pc) 2243 { 2244 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 2245 PetscErrorCode ierr; 2246 2247 PetscFunctionBegin; 2248 ierr = PCReset_BDDC(pc);CHKERRQ(ierr); 2249 ierr = KSPDestroy(&pcbddc->ksp_D);CHKERRQ(ierr); 2250 ierr = KSPDestroy(&pcbddc->ksp_R);CHKERRQ(ierr); 2251 ierr = KSPDestroy(&pcbddc->coarse_ksp);CHKERRQ(ierr); 2252 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDiscreteGradient_C",NULL);CHKERRQ(ierr); 2253 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDivergenceMat_C",NULL);CHKERRQ(ierr); 2254 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetChangeOfBasisMat_C",NULL);CHKERRQ(ierr); 2255 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetPrimalVerticesLocalIS_C",NULL);CHKERRQ(ierr); 2256 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetPrimalVerticesIS_C",NULL);CHKERRQ(ierr); 2257 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetCoarseningRatio_C",NULL);CHKERRQ(ierr); 2258 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLevel_C",NULL);CHKERRQ(ierr); 2259 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetUseExactDirichlet_C",NULL);CHKERRQ(ierr); 2260 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLevels_C",NULL);CHKERRQ(ierr); 2261 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDirichletBoundaries_C",NULL);CHKERRQ(ierr); 2262 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDirichletBoundariesLocal_C",NULL);CHKERRQ(ierr); 2263 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetNeumannBoundaries_C",NULL);CHKERRQ(ierr); 2264 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetNeumannBoundariesLocal_C",NULL);CHKERRQ(ierr); 2265 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetDirichletBoundaries_C",NULL);CHKERRQ(ierr); 2266 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetDirichletBoundariesLocal_C",NULL);CHKERRQ(ierr); 2267 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetNeumannBoundaries_C",NULL);CHKERRQ(ierr); 2268 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetNeumannBoundariesLocal_C",NULL);CHKERRQ(ierr); 2269 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDofsSplitting_C",NULL);CHKERRQ(ierr); 2270 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDofsSplittingLocal_C",NULL);CHKERRQ(ierr); 2271 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLocalAdjacencyGraph_C",NULL);CHKERRQ(ierr); 2272 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCCreateFETIDPOperators_C",NULL);CHKERRQ(ierr); 2273 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCMatFETIDPGetRHS_C",NULL);CHKERRQ(ierr); 2274 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCMatFETIDPGetSolution_C",NULL);CHKERRQ(ierr); 2275 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCPreSolveChangeRHS_C",NULL);CHKERRQ(ierr); 2276 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCSetCoordinates_C",NULL);CHKERRQ(ierr); 2277 ierr = PetscFree(pc->data);CHKERRQ(ierr); 2278 PetscFunctionReturn(0); 2279 } 2280 2281 static PetscErrorCode PCSetCoordinates_BDDC(PC pc, PetscInt dim, PetscInt nloc, PetscReal *coords) 2282 { 2283 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 2284 PCBDDCGraph mat_graph = pcbddc->mat_graph; 2285 PetscErrorCode ierr; 2286 2287 PetscFunctionBegin; 2288 ierr = PetscFree(mat_graph->coords);CHKERRQ(ierr); 2289 ierr = PetscMalloc1(nloc*dim,&mat_graph->coords);CHKERRQ(ierr); 2290 ierr = PetscMemcpy(mat_graph->coords,coords,nloc*dim*sizeof(PetscReal));CHKERRQ(ierr); 2291 mat_graph->cnloc = nloc; 2292 mat_graph->cdim = dim; 2293 mat_graph->cloc = PETSC_FALSE; 2294 PetscFunctionReturn(0); 2295 } 2296 2297 static PetscErrorCode PCPreSolveChangeRHS_BDDC(PC pc, PetscBool* change) 2298 { 2299 PetscFunctionBegin; 2300 *change = PETSC_TRUE; 2301 PetscFunctionReturn(0); 2302 } 2303 2304 static PetscErrorCode PCBDDCMatFETIDPGetRHS_BDDC(Mat fetidp_mat, Vec standard_rhs, Vec fetidp_flux_rhs) 2305 { 2306 FETIDPMat_ctx mat_ctx; 2307 Vec work; 2308 PC_IS* pcis; 2309 PC_BDDC* pcbddc; 2310 PetscErrorCode ierr; 2311 2312 PetscFunctionBegin; 2313 ierr = MatShellGetContext(fetidp_mat,&mat_ctx);CHKERRQ(ierr); 2314 pcis = (PC_IS*)mat_ctx->pc->data; 2315 pcbddc = (PC_BDDC*)mat_ctx->pc->data; 2316 2317 ierr = VecSet(fetidp_flux_rhs,0.0);CHKERRQ(ierr); 2318 /* copy rhs since we may change it during PCPreSolve_BDDC */ 2319 if (!pcbddc->original_rhs) { 2320 ierr = VecDuplicate(pcis->vec1_global,&pcbddc->original_rhs);CHKERRQ(ierr); 2321 } 2322 if (mat_ctx->rhs_flip) { 2323 ierr = VecPointwiseMult(pcbddc->original_rhs,standard_rhs,mat_ctx->rhs_flip);CHKERRQ(ierr); 2324 } else { 2325 ierr = VecCopy(standard_rhs,pcbddc->original_rhs);CHKERRQ(ierr); 2326 } 2327 if (mat_ctx->g2g_p) { 2328 /* interface pressure rhs */ 2329 ierr = VecScatterBegin(mat_ctx->g2g_p,fetidp_flux_rhs,pcbddc->original_rhs,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2330 ierr = VecScatterEnd(mat_ctx->g2g_p,fetidp_flux_rhs,pcbddc->original_rhs,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2331 ierr = VecScatterBegin(mat_ctx->g2g_p,standard_rhs,fetidp_flux_rhs,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2332 ierr = VecScatterEnd(mat_ctx->g2g_p,standard_rhs,fetidp_flux_rhs,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2333 if (!mat_ctx->rhs_flip) { 2334 ierr = VecScale(fetidp_flux_rhs,-1.);CHKERRQ(ierr); 2335 } 2336 } 2337 /* 2338 change of basis for physical rhs if needed 2339 It also changes the rhs in case of dirichlet boundaries 2340 */ 2341 ierr = PCPreSolve_BDDC(mat_ctx->pc,NULL,pcbddc->original_rhs,NULL);CHKERRQ(ierr); 2342 if (pcbddc->ChangeOfBasisMatrix) { 2343 ierr = MatMultTranspose(pcbddc->ChangeOfBasisMatrix,pcbddc->original_rhs,pcbddc->work_change);CHKERRQ(ierr); 2344 work = pcbddc->work_change; 2345 } else { 2346 work = pcbddc->original_rhs; 2347 } 2348 /* store vectors for computation of fetidp final solution */ 2349 ierr = VecScatterBegin(pcis->global_to_D,work,mat_ctx->temp_solution_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2350 ierr = VecScatterEnd(pcis->global_to_D,work,mat_ctx->temp_solution_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2351 /* scale rhs since it should be unassembled */ 2352 /* TODO use counter scaling? (also below) */ 2353 ierr = VecScatterBegin(pcis->global_to_B,work,mat_ctx->temp_solution_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2354 ierr = VecScatterEnd(pcis->global_to_B,work,mat_ctx->temp_solution_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2355 /* Apply partition of unity */ 2356 ierr = VecPointwiseMult(mat_ctx->temp_solution_B,pcis->D,mat_ctx->temp_solution_B);CHKERRQ(ierr); 2357 /* ierr = PCBDDCScalingRestriction(mat_ctx->pc,work,mat_ctx->temp_solution_B);CHKERRQ(ierr); */ 2358 if (!pcbddc->switch_static) { 2359 /* compute partially subassembled Schur complement right-hand side */ 2360 ierr = KSPSolve(pcbddc->ksp_D,mat_ctx->temp_solution_D,pcis->vec1_D);CHKERRQ(ierr); 2361 ierr = MatMult(pcis->A_BI,pcis->vec1_D,pcis->vec1_B);CHKERRQ(ierr); 2362 ierr = VecAXPY(mat_ctx->temp_solution_B,-1.0,pcis->vec1_B);CHKERRQ(ierr); 2363 ierr = VecSet(work,0.0);CHKERRQ(ierr); 2364 ierr = VecScatterBegin(pcis->global_to_B,mat_ctx->temp_solution_B,work,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2365 ierr = VecScatterEnd(pcis->global_to_B,mat_ctx->temp_solution_B,work,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2366 /* ierr = PCBDDCScalingRestriction(mat_ctx->pc,work,mat_ctx->temp_solution_B);CHKERRQ(ierr); */ 2367 ierr = VecScatterBegin(pcis->global_to_B,work,mat_ctx->temp_solution_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2368 ierr = VecScatterEnd(pcis->global_to_B,work,mat_ctx->temp_solution_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2369 ierr = VecPointwiseMult(mat_ctx->temp_solution_B,pcis->D,mat_ctx->temp_solution_B);CHKERRQ(ierr); 2370 } 2371 /* BDDC rhs */ 2372 ierr = VecCopy(mat_ctx->temp_solution_B,pcis->vec1_B);CHKERRQ(ierr); 2373 if (pcbddc->switch_static) { 2374 ierr = VecCopy(mat_ctx->temp_solution_D,pcis->vec1_D);CHKERRQ(ierr); 2375 } 2376 /* apply BDDC */ 2377 ierr = PetscMemzero(pcbddc->benign_p0,pcbddc->benign_n*sizeof(PetscScalar));CHKERRQ(ierr); 2378 ierr = PCBDDCApplyInterfacePreconditioner(mat_ctx->pc,PETSC_FALSE);CHKERRQ(ierr); 2379 ierr = PetscMemzero(pcbddc->benign_p0,pcbddc->benign_n*sizeof(PetscScalar));CHKERRQ(ierr); 2380 2381 /* Application of B_delta and assembling of rhs for fetidp fluxes */ 2382 ierr = MatMult(mat_ctx->B_delta,pcis->vec1_B,mat_ctx->lambda_local);CHKERRQ(ierr); 2383 ierr = VecScatterBegin(mat_ctx->l2g_lambda,mat_ctx->lambda_local,fetidp_flux_rhs,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2384 ierr = VecScatterEnd(mat_ctx->l2g_lambda,mat_ctx->lambda_local,fetidp_flux_rhs,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2385 /* Add contribution to interface pressures */ 2386 if (mat_ctx->l2g_p) { 2387 ierr = MatMult(mat_ctx->B_BB,pcis->vec1_B,mat_ctx->vP);CHKERRQ(ierr); 2388 if (pcbddc->switch_static) { 2389 ierr = MatMultAdd(mat_ctx->B_BI,pcis->vec1_D,mat_ctx->vP,mat_ctx->vP);CHKERRQ(ierr); 2390 } 2391 ierr = VecScatterBegin(mat_ctx->l2g_p,mat_ctx->vP,fetidp_flux_rhs,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2392 ierr = VecScatterEnd(mat_ctx->l2g_p,mat_ctx->vP,fetidp_flux_rhs,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 2393 } 2394 PetscFunctionReturn(0); 2395 } 2396 2397 /*@ 2398 PCBDDCMatFETIDPGetRHS - Compute the right-hand side for FETI-DP linear system using the physical right-hand side 2399 2400 Collective 2401 2402 Input Parameters: 2403 + fetidp_mat - the FETI-DP matrix object obtained by a call to PCBDDCCreateFETIDPOperators 2404 - standard_rhs - the right-hand side of the original linear system 2405 2406 Output Parameters: 2407 . fetidp_flux_rhs - the right-hand side for the FETI-DP linear system 2408 2409 Level: developer 2410 2411 Notes: 2412 2413 .seealso: PCBDDC, PCBDDCCreateFETIDPOperators, PCBDDCMatFETIDPGetSolution 2414 @*/ 2415 PetscErrorCode PCBDDCMatFETIDPGetRHS(Mat fetidp_mat, Vec standard_rhs, Vec fetidp_flux_rhs) 2416 { 2417 FETIDPMat_ctx mat_ctx; 2418 PetscErrorCode ierr; 2419 2420 PetscFunctionBegin; 2421 PetscValidHeaderSpecific(fetidp_mat,MAT_CLASSID,1); 2422 PetscValidHeaderSpecific(standard_rhs,VEC_CLASSID,2); 2423 PetscValidHeaderSpecific(fetidp_flux_rhs,VEC_CLASSID,3); 2424 ierr = MatShellGetContext(fetidp_mat,&mat_ctx);CHKERRQ(ierr); 2425 ierr = PetscUseMethod(mat_ctx->pc,"PCBDDCMatFETIDPGetRHS_C",(Mat,Vec,Vec),(fetidp_mat,standard_rhs,fetidp_flux_rhs));CHKERRQ(ierr); 2426 PetscFunctionReturn(0); 2427 } 2428 2429 static PetscErrorCode PCBDDCMatFETIDPGetSolution_BDDC(Mat fetidp_mat, Vec fetidp_flux_sol, Vec standard_sol) 2430 { 2431 FETIDPMat_ctx mat_ctx; 2432 PC_IS* pcis; 2433 PC_BDDC* pcbddc; 2434 PetscErrorCode ierr; 2435 Vec work; 2436 2437 PetscFunctionBegin; 2438 ierr = MatShellGetContext(fetidp_mat,&mat_ctx);CHKERRQ(ierr); 2439 pcis = (PC_IS*)mat_ctx->pc->data; 2440 pcbddc = (PC_BDDC*)mat_ctx->pc->data; 2441 2442 /* apply B_delta^T */ 2443 ierr = VecSet(pcis->vec1_B,0.);CHKERRQ(ierr); 2444 ierr = VecScatterBegin(mat_ctx->l2g_lambda,fetidp_flux_sol,mat_ctx->lambda_local,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2445 ierr = VecScatterEnd(mat_ctx->l2g_lambda,fetidp_flux_sol,mat_ctx->lambda_local,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2446 ierr = MatMultTranspose(mat_ctx->B_delta,mat_ctx->lambda_local,pcis->vec1_B);CHKERRQ(ierr); 2447 if (mat_ctx->l2g_p) { 2448 ierr = VecScatterBegin(mat_ctx->l2g_p,fetidp_flux_sol,mat_ctx->vP,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2449 ierr = VecScatterEnd(mat_ctx->l2g_p,fetidp_flux_sol,mat_ctx->vP,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2450 ierr = MatMultAdd(mat_ctx->Bt_BB,mat_ctx->vP,pcis->vec1_B,pcis->vec1_B);CHKERRQ(ierr); 2451 } 2452 2453 /* compute rhs for BDDC application */ 2454 ierr = VecAYPX(pcis->vec1_B,-1.0,mat_ctx->temp_solution_B);CHKERRQ(ierr); 2455 if (pcbddc->switch_static) { 2456 ierr = VecCopy(mat_ctx->temp_solution_D,pcis->vec1_D);CHKERRQ(ierr); 2457 if (mat_ctx->l2g_p) { 2458 ierr = VecScale(mat_ctx->vP,-1.);CHKERRQ(ierr); 2459 ierr = MatMultAdd(mat_ctx->Bt_BI,mat_ctx->vP,pcis->vec1_D,pcis->vec1_D);CHKERRQ(ierr); 2460 } 2461 } 2462 2463 /* apply BDDC */ 2464 ierr = PetscMemzero(pcbddc->benign_p0,pcbddc->benign_n*sizeof(PetscScalar));CHKERRQ(ierr); 2465 ierr = PCBDDCApplyInterfacePreconditioner(mat_ctx->pc,PETSC_FALSE);CHKERRQ(ierr); 2466 2467 /* put values into global vector */ 2468 if (pcbddc->ChangeOfBasisMatrix) work = pcbddc->work_change; 2469 else work = standard_sol; 2470 ierr = VecScatterBegin(pcis->global_to_B,pcis->vec1_B,work,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2471 ierr = VecScatterEnd(pcis->global_to_B,pcis->vec1_B,work,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2472 if (!pcbddc->switch_static) { 2473 /* compute values into the interior if solved for the partially subassembled Schur complement */ 2474 ierr = MatMult(pcis->A_IB,pcis->vec1_B,pcis->vec1_D);CHKERRQ(ierr); 2475 ierr = VecAYPX(pcis->vec1_D,-1.0,mat_ctx->temp_solution_D);CHKERRQ(ierr); 2476 ierr = KSPSolve(pcbddc->ksp_D,pcis->vec1_D,pcis->vec1_D);CHKERRQ(ierr); 2477 } 2478 2479 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec1_D,work,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2480 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec1_D,work,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2481 /* add p0 solution to final solution */ 2482 ierr = PCBDDCBenignGetOrSetP0(mat_ctx->pc,work,PETSC_FALSE);CHKERRQ(ierr); 2483 if (pcbddc->ChangeOfBasisMatrix) { 2484 ierr = MatMult(pcbddc->ChangeOfBasisMatrix,work,standard_sol);CHKERRQ(ierr); 2485 } 2486 ierr = PCPostSolve_BDDC(mat_ctx->pc,NULL,NULL,standard_sol);CHKERRQ(ierr); 2487 if (mat_ctx->g2g_p) { 2488 ierr = VecScatterBegin(mat_ctx->g2g_p,fetidp_flux_sol,standard_sol,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2489 ierr = VecScatterEnd(mat_ctx->g2g_p,fetidp_flux_sol,standard_sol,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 2490 } 2491 PetscFunctionReturn(0); 2492 } 2493 2494 static PetscErrorCode PCView_BDDCIPC(PC pc, PetscViewer viewer) 2495 { 2496 PetscErrorCode ierr; 2497 BDDCIPC_ctx bddcipc_ctx; 2498 PetscBool isascii; 2499 2500 PetscFunctionBegin; 2501 ierr = PCShellGetContext(pc,(void **)&bddcipc_ctx);CHKERRQ(ierr); 2502 ierr = PetscObjectTypeCompare((PetscObject)viewer,PETSCVIEWERASCII,&isascii);CHKERRQ(ierr); 2503 if (isascii) { 2504 ierr = PetscViewerASCIIPrintf(viewer,"BDDC interface preconditioner\n");CHKERRQ(ierr); 2505 } 2506 ierr = PetscViewerASCIIPushTab(viewer);CHKERRQ(ierr); 2507 ierr = PCView(bddcipc_ctx->bddc,viewer);CHKERRQ(ierr); 2508 ierr = PetscViewerASCIIPopTab(viewer);CHKERRQ(ierr); 2509 PetscFunctionReturn(0); 2510 } 2511 2512 static PetscErrorCode PCSetUp_BDDCIPC(PC pc) 2513 { 2514 PetscErrorCode ierr; 2515 BDDCIPC_ctx bddcipc_ctx; 2516 PetscBool isbddc; 2517 Vec vv; 2518 IS is; 2519 PC_IS *pcis; 2520 2521 PetscFunctionBegin; 2522 ierr = PCShellGetContext(pc,(void **)&bddcipc_ctx);CHKERRQ(ierr); 2523 ierr = PetscObjectTypeCompare((PetscObject)bddcipc_ctx->bddc,PCBDDC,&isbddc);CHKERRQ(ierr); 2524 if (!isbddc) SETERRQ1(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Invalid type %s. Must be of type bddc",((PetscObject)bddcipc_ctx->bddc)->type_name); 2525 ierr = PCSetUp(bddcipc_ctx->bddc);CHKERRQ(ierr); 2526 2527 /* create interface scatter */ 2528 pcis = (PC_IS*)(bddcipc_ctx->bddc->data); 2529 ierr = VecScatterDestroy(&bddcipc_ctx->g2l);CHKERRQ(ierr); 2530 ierr = MatCreateVecs(pc->pmat,&vv,NULL);CHKERRQ(ierr); 2531 ierr = ISRenumber(pcis->is_B_global,NULL,NULL,&is);CHKERRQ(ierr); 2532 ierr = VecScatterCreateWithData(vv,is,pcis->vec1_B,NULL,&bddcipc_ctx->g2l);CHKERRQ(ierr); 2533 ierr = ISDestroy(&is);CHKERRQ(ierr); 2534 ierr = VecDestroy(&vv);CHKERRQ(ierr); 2535 PetscFunctionReturn(0); 2536 } 2537 2538 static PetscErrorCode PCApply_BDDCIPC(PC pc, Vec r, Vec x) 2539 { 2540 PetscErrorCode ierr; 2541 BDDCIPC_ctx bddcipc_ctx; 2542 PC_IS *pcis; 2543 VecScatter tmps; 2544 2545 PetscFunctionBegin; 2546 ierr = PCShellGetContext(pc,(void **)&bddcipc_ctx);CHKERRQ(ierr); 2547 pcis = (PC_IS*)(bddcipc_ctx->bddc->data); 2548 tmps = pcis->global_to_B; 2549 pcis->global_to_B = bddcipc_ctx->g2l; 2550 ierr = PCBDDCScalingRestriction(bddcipc_ctx->bddc,r,pcis->vec1_B);CHKERRQ(ierr); 2551 ierr = PCBDDCApplyInterfacePreconditioner(bddcipc_ctx->bddc,PETSC_FALSE);CHKERRQ(ierr); 2552 ierr = PCBDDCScalingExtension(bddcipc_ctx->bddc,pcis->vec1_B,x);CHKERRQ(ierr); 2553 pcis->global_to_B = tmps; 2554 PetscFunctionReturn(0); 2555 } 2556 2557 static PetscErrorCode PCApplyTranspose_BDDCIPC(PC pc, Vec r, Vec x) 2558 { 2559 PetscErrorCode ierr; 2560 BDDCIPC_ctx bddcipc_ctx; 2561 PC_IS *pcis; 2562 VecScatter tmps; 2563 2564 PetscFunctionBegin; 2565 ierr = PCShellGetContext(pc,(void **)&bddcipc_ctx);CHKERRQ(ierr); 2566 pcis = (PC_IS*)(bddcipc_ctx->bddc->data); 2567 tmps = pcis->global_to_B; 2568 pcis->global_to_B = bddcipc_ctx->g2l; 2569 ierr = PCBDDCScalingRestriction(bddcipc_ctx->bddc,r,pcis->vec1_B);CHKERRQ(ierr); 2570 ierr = PCBDDCApplyInterfacePreconditioner(bddcipc_ctx->bddc,PETSC_TRUE);CHKERRQ(ierr); 2571 ierr = PCBDDCScalingExtension(bddcipc_ctx->bddc,pcis->vec1_B,x);CHKERRQ(ierr); 2572 pcis->global_to_B = tmps; 2573 PetscFunctionReturn(0); 2574 } 2575 2576 static PetscErrorCode PCDestroy_BDDCIPC(PC pc) 2577 { 2578 PetscErrorCode ierr; 2579 BDDCIPC_ctx bddcipc_ctx; 2580 2581 PetscFunctionBegin; 2582 ierr = PCShellGetContext(pc,(void **)&bddcipc_ctx);CHKERRQ(ierr); 2583 ierr = PCDestroy(&bddcipc_ctx->bddc);CHKERRQ(ierr); 2584 ierr = VecScatterDestroy(&bddcipc_ctx->g2l);CHKERRQ(ierr); 2585 ierr = PetscFree(bddcipc_ctx);CHKERRQ(ierr); 2586 PetscFunctionReturn(0); 2587 } 2588 2589 /*@ 2590 PCBDDCMatFETIDPGetSolution - Compute the physical solution using the solution of the FETI-DP linear system 2591 2592 Collective 2593 2594 Input Parameters: 2595 + fetidp_mat - the FETI-DP matrix obtained by a call to PCBDDCCreateFETIDPOperators 2596 - fetidp_flux_sol - the solution of the FETI-DP linear system 2597 2598 Output Parameters: 2599 . standard_sol - the solution defined on the physical domain 2600 2601 Level: developer 2602 2603 Notes: 2604 2605 .seealso: PCBDDC, PCBDDCCreateFETIDPOperators, PCBDDCMatFETIDPGetRHS 2606 @*/ 2607 PetscErrorCode PCBDDCMatFETIDPGetSolution(Mat fetidp_mat, Vec fetidp_flux_sol, Vec standard_sol) 2608 { 2609 FETIDPMat_ctx mat_ctx; 2610 PetscErrorCode ierr; 2611 2612 PetscFunctionBegin; 2613 PetscValidHeaderSpecific(fetidp_mat,MAT_CLASSID,1); 2614 PetscValidHeaderSpecific(fetidp_flux_sol,VEC_CLASSID,2); 2615 PetscValidHeaderSpecific(standard_sol,VEC_CLASSID,3); 2616 ierr = MatShellGetContext(fetidp_mat,&mat_ctx);CHKERRQ(ierr); 2617 ierr = PetscUseMethod(mat_ctx->pc,"PCBDDCMatFETIDPGetSolution_C",(Mat,Vec,Vec),(fetidp_mat,fetidp_flux_sol,standard_sol));CHKERRQ(ierr); 2618 PetscFunctionReturn(0); 2619 } 2620 2621 static PetscErrorCode PCBDDCCreateFETIDPOperators_BDDC(PC pc, PetscBool fully_redundant, const char* prefix, Mat *fetidp_mat, PC *fetidp_pc) 2622 { 2623 2624 FETIDPMat_ctx fetidpmat_ctx; 2625 Mat newmat; 2626 FETIDPPC_ctx fetidppc_ctx; 2627 PC newpc; 2628 MPI_Comm comm; 2629 PetscErrorCode ierr; 2630 2631 PetscFunctionBegin; 2632 ierr = PetscObjectGetComm((PetscObject)pc,&comm);CHKERRQ(ierr); 2633 /* FETI-DP matrix */ 2634 ierr = PCBDDCCreateFETIDPMatContext(pc,&fetidpmat_ctx);CHKERRQ(ierr); 2635 fetidpmat_ctx->fully_redundant = fully_redundant; 2636 ierr = PCBDDCSetupFETIDPMatContext(fetidpmat_ctx);CHKERRQ(ierr); 2637 ierr = MatCreateShell(comm,fetidpmat_ctx->n,fetidpmat_ctx->n,fetidpmat_ctx->N,fetidpmat_ctx->N,fetidpmat_ctx,&newmat);CHKERRQ(ierr); 2638 ierr = PetscObjectSetName((PetscObject)newmat,!fetidpmat_ctx->l2g_lambda_only ? "F" : "G");CHKERRQ(ierr); 2639 ierr = MatShellSetOperation(newmat,MATOP_MULT,(void (*)(void))FETIDPMatMult);CHKERRQ(ierr); 2640 ierr = MatShellSetOperation(newmat,MATOP_MULT_TRANSPOSE,(void (*)(void))FETIDPMatMultTranspose);CHKERRQ(ierr); 2641 ierr = MatShellSetOperation(newmat,MATOP_DESTROY,(void (*)(void))PCBDDCDestroyFETIDPMat);CHKERRQ(ierr); 2642 /* propagate MatOptions */ 2643 { 2644 PC_BDDC *pcbddc = (PC_BDDC*)fetidpmat_ctx->pc->data; 2645 PetscBool issym; 2646 2647 ierr = MatGetOption(pc->mat,MAT_SYMMETRIC,&issym);CHKERRQ(ierr); 2648 if (issym || pcbddc->symmetric_primal) { 2649 ierr = MatSetOption(newmat,MAT_SYMMETRIC,PETSC_TRUE);CHKERRQ(ierr); 2650 } 2651 } 2652 ierr = MatSetOptionsPrefix(newmat,prefix);CHKERRQ(ierr); 2653 ierr = MatAppendOptionsPrefix(newmat,"fetidp_");CHKERRQ(ierr); 2654 ierr = MatSetUp(newmat);CHKERRQ(ierr); 2655 /* FETI-DP preconditioner */ 2656 ierr = PCBDDCCreateFETIDPPCContext(pc,&fetidppc_ctx);CHKERRQ(ierr); 2657 ierr = PCBDDCSetupFETIDPPCContext(newmat,fetidppc_ctx);CHKERRQ(ierr); 2658 ierr = PCCreate(comm,&newpc);CHKERRQ(ierr); 2659 ierr = PCSetOperators(newpc,newmat,newmat);CHKERRQ(ierr); 2660 ierr = PCSetOptionsPrefix(newpc,prefix);CHKERRQ(ierr); 2661 ierr = PCAppendOptionsPrefix(newpc,"fetidp_");CHKERRQ(ierr); 2662 ierr = PCSetErrorIfFailure(newpc,pc->erroriffailure);CHKERRQ(ierr); 2663 if (!fetidpmat_ctx->l2g_lambda_only) { /* standard FETI-DP */ 2664 ierr = PCSetType(newpc,PCSHELL);CHKERRQ(ierr); 2665 ierr = PCShellSetName(newpc,"FETI-DP multipliers");CHKERRQ(ierr); 2666 ierr = PCShellSetContext(newpc,fetidppc_ctx);CHKERRQ(ierr); 2667 ierr = PCShellSetApply(newpc,FETIDPPCApply);CHKERRQ(ierr); 2668 ierr = PCShellSetApplyTranspose(newpc,FETIDPPCApplyTranspose);CHKERRQ(ierr); 2669 ierr = PCShellSetView(newpc,FETIDPPCView);CHKERRQ(ierr); 2670 ierr = PCShellSetDestroy(newpc,PCBDDCDestroyFETIDPPC);CHKERRQ(ierr); 2671 } else { /* saddle-point FETI-DP */ 2672 Mat M; 2673 PetscInt psize; 2674 PetscBool fake = PETSC_FALSE, isfieldsplit; 2675 2676 ierr = ISViewFromOptions(fetidpmat_ctx->lagrange,NULL,"-lag_view");CHKERRQ(ierr); 2677 ierr = ISViewFromOptions(fetidpmat_ctx->pressure,NULL,"-press_view");CHKERRQ(ierr); 2678 ierr = PetscObjectQuery((PetscObject)pc,"__KSPFETIDP_PPmat",(PetscObject*)&M);CHKERRQ(ierr); 2679 ierr = PCSetType(newpc,PCFIELDSPLIT);CHKERRQ(ierr); 2680 ierr = PCFieldSplitSetIS(newpc,"lag",fetidpmat_ctx->lagrange);CHKERRQ(ierr); 2681 ierr = PCFieldSplitSetIS(newpc,"p",fetidpmat_ctx->pressure);CHKERRQ(ierr); 2682 ierr = PCFieldSplitSetType(newpc,PC_COMPOSITE_SCHUR);CHKERRQ(ierr); 2683 ierr = PCFieldSplitSetSchurFactType(newpc,PC_FIELDSPLIT_SCHUR_FACT_DIAG);CHKERRQ(ierr); 2684 ierr = ISGetSize(fetidpmat_ctx->pressure,&psize);CHKERRQ(ierr); 2685 if (psize != M->rmap->N) { 2686 Mat M2; 2687 PetscInt lpsize; 2688 2689 fake = PETSC_TRUE; 2690 ierr = ISGetLocalSize(fetidpmat_ctx->pressure,&lpsize);CHKERRQ(ierr); 2691 ierr = MatCreate(comm,&M2);CHKERRQ(ierr); 2692 ierr = MatSetType(M2,MATAIJ);CHKERRQ(ierr); 2693 ierr = MatSetSizes(M2,lpsize,lpsize,psize,psize);CHKERRQ(ierr); 2694 ierr = MatSetUp(M2);CHKERRQ(ierr); 2695 ierr = MatAssemblyBegin(M2,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 2696 ierr = MatAssemblyEnd(M2,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 2697 ierr = PCFieldSplitSetSchurPre(newpc,PC_FIELDSPLIT_SCHUR_PRE_USER,M2);CHKERRQ(ierr); 2698 ierr = MatDestroy(&M2);CHKERRQ(ierr); 2699 } else { 2700 ierr = PCFieldSplitSetSchurPre(newpc,PC_FIELDSPLIT_SCHUR_PRE_USER,M);CHKERRQ(ierr); 2701 } 2702 ierr = PCFieldSplitSetSchurScale(newpc,1.0);CHKERRQ(ierr); 2703 2704 /* we need to setfromoptions and setup here to access the blocks */ 2705 ierr = PCSetFromOptions(newpc);CHKERRQ(ierr); 2706 ierr = PCSetUp(newpc);CHKERRQ(ierr); 2707 2708 /* user may have changed the type (e.g. -fetidp_pc_type none) */ 2709 ierr = PetscObjectTypeCompare((PetscObject)newpc,PCFIELDSPLIT,&isfieldsplit);CHKERRQ(ierr); 2710 if (isfieldsplit) { 2711 KSP *ksps; 2712 PC ppc,lagpc; 2713 PetscInt nn; 2714 PetscBool ismatis,matisok = PETSC_FALSE,check = PETSC_FALSE; 2715 2716 /* set the solver for the (0,0) block */ 2717 ierr = PCFieldSplitSchurGetSubKSP(newpc,&nn,&ksps);CHKERRQ(ierr); 2718 if (!nn) { /* not of type PC_COMPOSITE_SCHUR */ 2719 ierr = PCFieldSplitGetSubKSP(newpc,&nn,&ksps);CHKERRQ(ierr); 2720 if (!fake) { /* pass pmat to the pressure solver */ 2721 Mat F; 2722 2723 ierr = KSPGetOperators(ksps[1],&F,NULL);CHKERRQ(ierr); 2724 ierr = KSPSetOperators(ksps[1],F,M);CHKERRQ(ierr); 2725 } 2726 } else { 2727 PetscBool issym; 2728 Mat S; 2729 2730 ierr = PCFieldSplitSchurGetS(newpc,&S);CHKERRQ(ierr); 2731 2732 ierr = MatGetOption(newmat,MAT_SYMMETRIC,&issym);CHKERRQ(ierr); 2733 if (issym) { 2734 ierr = MatSetOption(S,MAT_SYMMETRIC,PETSC_TRUE);CHKERRQ(ierr); 2735 } 2736 } 2737 ierr = KSPGetPC(ksps[0],&lagpc);CHKERRQ(ierr); 2738 ierr = PCSetType(lagpc,PCSHELL);CHKERRQ(ierr); 2739 ierr = PCShellSetName(lagpc,"FETI-DP multipliers");CHKERRQ(ierr); 2740 ierr = PCShellSetContext(lagpc,fetidppc_ctx);CHKERRQ(ierr); 2741 ierr = PCShellSetApply(lagpc,FETIDPPCApply);CHKERRQ(ierr); 2742 ierr = PCShellSetApplyTranspose(lagpc,FETIDPPCApplyTranspose);CHKERRQ(ierr); 2743 ierr = PCShellSetView(lagpc,FETIDPPCView);CHKERRQ(ierr); 2744 ierr = PCShellSetDestroy(lagpc,PCBDDCDestroyFETIDPPC);CHKERRQ(ierr); 2745 2746 /* Olof's idea: interface Schur complement preconditioner for the mass matrix */ 2747 ierr = KSPGetPC(ksps[1],&ppc);CHKERRQ(ierr); 2748 if (fake) { 2749 BDDCIPC_ctx bddcipc_ctx; 2750 PetscContainer c; 2751 2752 matisok = PETSC_TRUE; 2753 2754 /* create inner BDDC solver */ 2755 ierr = PetscNew(&bddcipc_ctx);CHKERRQ(ierr); 2756 ierr = PCCreate(comm,&bddcipc_ctx->bddc);CHKERRQ(ierr); 2757 ierr = PCSetType(bddcipc_ctx->bddc,PCBDDC);CHKERRQ(ierr); 2758 ierr = PCSetOperators(bddcipc_ctx->bddc,M,M);CHKERRQ(ierr); 2759 ierr = PetscObjectQuery((PetscObject)pc,"__KSPFETIDP_pCSR",(PetscObject*)&c);CHKERRQ(ierr); 2760 ierr = PetscObjectTypeCompare((PetscObject)M,MATIS,&ismatis);CHKERRQ(ierr); 2761 if (c && ismatis) { 2762 Mat lM; 2763 PetscInt *csr,n; 2764 2765 ierr = MatISGetLocalMat(M,&lM);CHKERRQ(ierr); 2766 ierr = MatGetSize(lM,&n,NULL);CHKERRQ(ierr); 2767 ierr = PetscContainerGetPointer(c,(void**)&csr);CHKERRQ(ierr); 2768 ierr = PCBDDCSetLocalAdjacencyGraph(bddcipc_ctx->bddc,n,csr,csr + (n + 1),PETSC_COPY_VALUES);CHKERRQ(ierr); 2769 ierr = MatISRestoreLocalMat(M,&lM);CHKERRQ(ierr); 2770 } 2771 ierr = PCSetOptionsPrefix(bddcipc_ctx->bddc,((PetscObject)ksps[1])->prefix);CHKERRQ(ierr); 2772 ierr = PCSetErrorIfFailure(bddcipc_ctx->bddc,pc->erroriffailure);CHKERRQ(ierr); 2773 ierr = PCSetFromOptions(bddcipc_ctx->bddc);CHKERRQ(ierr); 2774 2775 /* wrap the interface application */ 2776 ierr = PCSetType(ppc,PCSHELL);CHKERRQ(ierr); 2777 ierr = PCShellSetName(ppc,"FETI-DP pressure");CHKERRQ(ierr); 2778 ierr = PCShellSetContext(ppc,bddcipc_ctx);CHKERRQ(ierr); 2779 ierr = PCShellSetSetUp(ppc,PCSetUp_BDDCIPC);CHKERRQ(ierr); 2780 ierr = PCShellSetApply(ppc,PCApply_BDDCIPC);CHKERRQ(ierr); 2781 ierr = PCShellSetApplyTranspose(ppc,PCApplyTranspose_BDDCIPC);CHKERRQ(ierr); 2782 ierr = PCShellSetView(ppc,PCView_BDDCIPC);CHKERRQ(ierr); 2783 ierr = PCShellSetDestroy(ppc,PCDestroy_BDDCIPC);CHKERRQ(ierr); 2784 } 2785 2786 /* determine if we need to assemble M to construct a preconditioner */ 2787 if (!matisok) { 2788 ierr = PetscObjectTypeCompare((PetscObject)M,MATIS,&ismatis);CHKERRQ(ierr); 2789 ierr = PetscObjectTypeCompareAny((PetscObject)ppc,&matisok,PCBDDC,PCJACOBI,PCNONE,PCMG,"");CHKERRQ(ierr); 2790 if (ismatis && !matisok) { 2791 ierr = MatConvert(M,MATAIJ,MAT_INPLACE_MATRIX,&M);CHKERRQ(ierr); 2792 } 2793 } 2794 2795 /* run the subproblems to check convergence */ 2796 ierr = PetscOptionsGetBool(NULL,((PetscObject)newmat)->prefix,"-check_saddlepoint",&check,NULL);CHKERRQ(ierr); 2797 if (check) { 2798 PetscInt i; 2799 2800 for (i=0;i<nn;i++) { 2801 KSP kspC; 2802 PC pc; 2803 Mat F,pF; 2804 Vec x,y; 2805 PetscBool isschur,prec = PETSC_TRUE; 2806 2807 ierr = KSPCreate(PetscObjectComm((PetscObject)ksps[i]),&kspC);CHKERRQ(ierr); 2808 ierr = KSPSetOptionsPrefix(kspC,((PetscObject)ksps[i])->prefix);CHKERRQ(ierr); 2809 ierr = KSPAppendOptionsPrefix(kspC,"check_");CHKERRQ(ierr); 2810 ierr = KSPGetOperators(ksps[i],&F,&pF);CHKERRQ(ierr); 2811 ierr = PetscObjectTypeCompare((PetscObject)F,MATSCHURCOMPLEMENT,&isschur);CHKERRQ(ierr); 2812 if (isschur) { 2813 KSP kspS,kspS2; 2814 Mat A00,pA00,A10,A01,A11; 2815 char prefix[256]; 2816 2817 ierr = MatSchurComplementGetKSP(F,&kspS);CHKERRQ(ierr); 2818 ierr = MatSchurComplementGetSubMatrices(F,&A00,&pA00,&A01,&A10,&A11);CHKERRQ(ierr); 2819 ierr = MatCreateSchurComplement(A00,pA00,A01,A10,A11,&F);CHKERRQ(ierr); 2820 ierr = MatSchurComplementGetKSP(F,&kspS2);CHKERRQ(ierr); 2821 ierr = PetscSNPrintf(prefix,sizeof(prefix),"%sschur_",((PetscObject)kspC)->prefix);CHKERRQ(ierr); 2822 ierr = KSPSetOptionsPrefix(kspS2,prefix);CHKERRQ(ierr); 2823 ierr = KSPGetPC(kspS2,&pc);CHKERRQ(ierr); 2824 ierr = PCSetType(pc,PCKSP);CHKERRQ(ierr); 2825 ierr = PCKSPSetKSP(pc,kspS);CHKERRQ(ierr); 2826 ierr = KSPSetFromOptions(kspS2);CHKERRQ(ierr); 2827 ierr = KSPGetPC(kspS2,&pc);CHKERRQ(ierr); 2828 ierr = PCSetUseAmat(pc,PETSC_TRUE);CHKERRQ(ierr); 2829 } else { 2830 ierr = PetscObjectReference((PetscObject)F);CHKERRQ(ierr); 2831 } 2832 ierr = KSPSetFromOptions(kspC);CHKERRQ(ierr); 2833 ierr = PetscOptionsGetBool(NULL,((PetscObject)kspC)->prefix,"-preconditioned",&prec,NULL);CHKERRQ(ierr); 2834 if (prec) { 2835 ierr = KSPGetPC(ksps[i],&pc);CHKERRQ(ierr); 2836 ierr = KSPSetPC(kspC,pc);CHKERRQ(ierr); 2837 } 2838 ierr = KSPSetOperators(kspC,F,pF);CHKERRQ(ierr); 2839 ierr = MatCreateVecs(F,&x,&y);CHKERRQ(ierr); 2840 ierr = VecSetRandom(x,NULL);CHKERRQ(ierr); 2841 ierr = MatMult(F,x,y);CHKERRQ(ierr); 2842 ierr = KSPSolve(kspC,y,x);CHKERRQ(ierr); 2843 ierr = KSPDestroy(&kspC);CHKERRQ(ierr); 2844 ierr = MatDestroy(&F);CHKERRQ(ierr); 2845 ierr = VecDestroy(&x);CHKERRQ(ierr); 2846 ierr = VecDestroy(&y);CHKERRQ(ierr); 2847 } 2848 } 2849 ierr = PetscFree(ksps);CHKERRQ(ierr); 2850 } 2851 } 2852 /* return pointers for objects created */ 2853 *fetidp_mat = newmat; 2854 *fetidp_pc = newpc; 2855 PetscFunctionReturn(0); 2856 } 2857 2858 /*@C 2859 PCBDDCCreateFETIDPOperators - Create FETI-DP operators 2860 2861 Collective 2862 2863 Input Parameters: 2864 + pc - the BDDC preconditioning context (setup should have been called before) 2865 . fully_redundant - true for a fully redundant set of Lagrange multipliers 2866 - prefix - optional options database prefix for the objects to be created (can be NULL) 2867 2868 Output Parameters: 2869 + fetidp_mat - shell FETI-DP matrix object 2870 - fetidp_pc - shell Dirichlet preconditioner for FETI-DP matrix 2871 2872 Level: developer 2873 2874 Notes: 2875 Currently the only operations provided for FETI-DP matrix are MatMult and MatMultTranspose 2876 2877 .seealso: PCBDDC, PCBDDCMatFETIDPGetRHS, PCBDDCMatFETIDPGetSolution 2878 @*/ 2879 PetscErrorCode PCBDDCCreateFETIDPOperators(PC pc, PetscBool fully_redundant, const char *prefix, Mat *fetidp_mat, PC *fetidp_pc) 2880 { 2881 PetscErrorCode ierr; 2882 2883 PetscFunctionBegin; 2884 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 2885 if (pc->setupcalled) { 2886 ierr = PetscUseMethod(pc,"PCBDDCCreateFETIDPOperators_C",(PC,PetscBool,const char*,Mat*,PC*),(pc,fully_redundant,prefix,fetidp_mat,fetidp_pc));CHKERRQ(ierr); 2887 } else SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"You must call PCSetup_BDDC() first"); 2888 PetscFunctionReturn(0); 2889 } 2890 /* -------------------------------------------------------------------------- */ 2891 /*MC 2892 PCBDDC - Balancing Domain Decomposition by Constraints. 2893 2894 An implementation of the BDDC preconditioner based on 2895 2896 .vb 2897 [1] C. R. Dohrmann. "An approximate BDDC preconditioner", Numerical Linear Algebra with Applications Volume 14, Issue 2, pages 149-168, March 2007 2898 [2] A. Klawonn and O. B. Widlund. "Dual-Primal FETI Methods for Linear Elasticity", http://cs.nyu.edu/csweb/Research/TechReports/TR2004-855/TR2004-855.pdf 2899 [3] J. Mandel, B. Sousedik, C. R. Dohrmann. "Multispace and Multilevel BDDC", http://arxiv.org/abs/0712.3977 2900 [4] C. Pechstein and C. R. Dohrmann. "Modern domain decomposition methods BDDC, deluxe scaling, and an algebraic approach", Seminar talk, Linz, December 2013, http://people.ricam.oeaw.ac.at/c.pechstein/pechstein-bddc2013.pdf 2901 .ve 2902 2903 The matrix to be preconditioned (Pmat) must be of type MATIS. 2904 2905 Currently works with MATIS matrices with local matrices of type MATSEQAIJ, MATSEQBAIJ or MATSEQSBAIJ, either with real or complex numbers. 2906 2907 It also works with unsymmetric and indefinite problems. 2908 2909 Unlike 'conventional' interface preconditioners, PCBDDC iterates over all degrees of freedom, not just those on the interface. This allows the use of approximate solvers on the subdomains. 2910 2911 Approximate local solvers are automatically adapted (see [1]) if the user has attached a nullspace object to the subdomain matrices, and informed BDDC of using approximate solvers (via the command line). 2912 2913 Boundary nodes are split in vertices, edges and faces classes using information from the local to global mapping of dofs and the local connectivity graph of nodes. The latter can be customized by using PCBDDCSetLocalAdjacencyGraph() 2914 Additional information on dofs can be provided by using PCBDDCSetDofsSplitting(), PCBDDCSetDirichletBoundaries(), PCBDDCSetNeumannBoundaries(), and PCBDDCSetPrimalVerticesIS() and their local counterparts. 2915 2916 Constraints can be customized by attaching a MatNullSpace object to the MATIS matrix via MatSetNearNullSpace(). Non-singular modes are retained via SVD. 2917 2918 Change of basis is performed similarly to [2] when requested. When more than one constraint is present on a single connected component (i.e. an edge or a face), a robust method based on local QR factorizations is used. 2919 User defined change of basis can be passed to PCBDDC by using PCBDDCSetChangeOfBasisMat() 2920 2921 The PETSc implementation also supports multilevel BDDC [3]. Coarse grids are partitioned using a MatPartitioning object. 2922 2923 Adaptive selection of primal constraints [4] is supported for SPD systems with high-contrast in the coefficients if MUMPS or MKL_PARDISO are present. Future versions of the code will also consider using PASTIX. 2924 2925 An experimental interface to the FETI-DP method is available. FETI-DP operators could be created using PCBDDCCreateFETIDPOperators(). A stand-alone class for the FETI-DP method will be provided in the next releases. 2926 Deluxe scaling is not supported yet for FETI-DP. 2927 2928 Options Database Keys (some of them, run with -h for a complete list): 2929 2930 . -pc_bddc_use_vertices <true> - use or not vertices in primal space 2931 . -pc_bddc_use_edges <true> - use or not edges in primal space 2932 . -pc_bddc_use_faces <false> - use or not faces in primal space 2933 . -pc_bddc_symmetric <true> - symmetric computation of primal basis functions. Specify false for unsymmetric problems 2934 . -pc_bddc_use_change_of_basis <false> - use change of basis approach (on edges only) 2935 . -pc_bddc_use_change_on_faces <false> - use change of basis approach on faces if change of basis has been requested 2936 . -pc_bddc_switch_static <false> - switches from M_2 (default) to M_3 operator (see reference article [1]) 2937 . -pc_bddc_levels <0> - maximum number of levels for multilevel 2938 . -pc_bddc_coarsening_ratio <8> - number of subdomains which will be aggregated together at the coarser level (e.g. H/h ratio at the coarser level, significative only in the multilevel case) 2939 . -pc_bddc_coarse_redistribute <0> - size of a subset of processors where the coarse problem will be remapped (the value is ignored if not at the coarsest level) 2940 . -pc_bddc_use_deluxe_scaling <false> - use deluxe scaling 2941 . -pc_bddc_schur_layers <-1> - select the economic version of deluxe scaling by specifying the number of layers (-1 corresponds to the original deluxe scaling) 2942 . -pc_bddc_adaptive_threshold <0.0> - when a value different than zero is specified, adaptive selection of constraints is performed on edges and faces (requires deluxe scaling and MUMPS or MKL_PARDISO installed) 2943 - -pc_bddc_check_level <0> - set verbosity level of debugging output 2944 2945 Options for Dirichlet, Neumann or coarse solver can be set with 2946 .vb 2947 -pc_bddc_dirichlet_ 2948 -pc_bddc_neumann_ 2949 -pc_bddc_coarse_ 2950 .ve 2951 e.g -pc_bddc_dirichlet_ksp_type richardson -pc_bddc_dirichlet_pc_type gamg. PCBDDC uses by default KPSPREONLY and PCLU. 2952 2953 When using a multilevel approach, solvers' options at the N-th level (N > 1) can be specified as 2954 .vb 2955 -pc_bddc_dirichlet_lN_ 2956 -pc_bddc_neumann_lN_ 2957 -pc_bddc_coarse_lN_ 2958 .ve 2959 Note that level number ranges from the finest (0) to the coarsest (N). 2960 In order to specify options for the BDDC operators at the coarser levels (and not for the solvers), prepend -pc_bddc_coarse_ or -pc_bddc_coarse_l to the option, e.g. 2961 .vb 2962 -pc_bddc_coarse_pc_bddc_adaptive_threshold 5 -pc_bddc_coarse_l1_pc_bddc_redistribute 3 2963 .ve 2964 will use a threshold of 5 for constraints' selection at the first coarse level and will redistribute the coarse problem of the first coarse level on 3 processors 2965 2966 Level: intermediate 2967 2968 Developer Notes: 2969 2970 Contributed by Stefano Zampini 2971 2972 .seealso: PCCreate(), PCSetType(), PCType (for list of available types), PC, MATIS 2973 M*/ 2974 2975 PETSC_EXTERN PetscErrorCode PCCreate_BDDC(PC pc) 2976 { 2977 PetscErrorCode ierr; 2978 PC_BDDC *pcbddc; 2979 2980 PetscFunctionBegin; 2981 ierr = PetscNewLog(pc,&pcbddc);CHKERRQ(ierr); 2982 pc->data = (void*)pcbddc; 2983 2984 /* create PCIS data structure */ 2985 ierr = PCISCreate(pc);CHKERRQ(ierr); 2986 2987 /* create local graph structure */ 2988 ierr = PCBDDCGraphCreate(&pcbddc->mat_graph);CHKERRQ(ierr); 2989 2990 /* BDDC nonzero defaults */ 2991 pcbddc->use_local_adj = PETSC_TRUE; 2992 pcbddc->use_vertices = PETSC_TRUE; 2993 pcbddc->use_edges = PETSC_TRUE; 2994 pcbddc->symmetric_primal = PETSC_TRUE; 2995 pcbddc->vertex_size = 1; 2996 pcbddc->recompute_topography = PETSC_TRUE; 2997 pcbddc->coarse_size = -1; 2998 pcbddc->use_exact_dirichlet_trick = PETSC_TRUE; 2999 pcbddc->coarsening_ratio = 8; 3000 pcbddc->coarse_eqs_per_proc = 1; 3001 pcbddc->benign_compute_correction = PETSC_TRUE; 3002 pcbddc->nedfield = -1; 3003 pcbddc->nedglobal = PETSC_TRUE; 3004 pcbddc->graphmaxcount = PETSC_MAX_INT; 3005 pcbddc->sub_schurs_layers = -1; 3006 pcbddc->adaptive_threshold[0] = 0.0; 3007 pcbddc->adaptive_threshold[1] = 0.0; 3008 3009 /* function pointers */ 3010 pc->ops->apply = PCApply_BDDC; 3011 pc->ops->applytranspose = PCApplyTranspose_BDDC; 3012 pc->ops->setup = PCSetUp_BDDC; 3013 pc->ops->destroy = PCDestroy_BDDC; 3014 pc->ops->setfromoptions = PCSetFromOptions_BDDC; 3015 pc->ops->view = PCView_BDDC; 3016 pc->ops->applyrichardson = 0; 3017 pc->ops->applysymmetricleft = 0; 3018 pc->ops->applysymmetricright = 0; 3019 pc->ops->presolve = PCPreSolve_BDDC; 3020 pc->ops->postsolve = PCPostSolve_BDDC; 3021 pc->ops->reset = PCReset_BDDC; 3022 3023 /* composing function */ 3024 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDiscreteGradient_C",PCBDDCSetDiscreteGradient_BDDC);CHKERRQ(ierr); 3025 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDivergenceMat_C",PCBDDCSetDivergenceMat_BDDC);CHKERRQ(ierr); 3026 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetChangeOfBasisMat_C",PCBDDCSetChangeOfBasisMat_BDDC);CHKERRQ(ierr); 3027 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetPrimalVerticesLocalIS_C",PCBDDCSetPrimalVerticesLocalIS_BDDC);CHKERRQ(ierr); 3028 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetPrimalVerticesIS_C",PCBDDCSetPrimalVerticesIS_BDDC);CHKERRQ(ierr); 3029 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetPrimalVerticesLocalIS_C",PCBDDCGetPrimalVerticesLocalIS_BDDC);CHKERRQ(ierr); 3030 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetPrimalVerticesIS_C",PCBDDCGetPrimalVerticesIS_BDDC);CHKERRQ(ierr); 3031 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetCoarseningRatio_C",PCBDDCSetCoarseningRatio_BDDC);CHKERRQ(ierr); 3032 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLevel_C",PCBDDCSetLevel_BDDC);CHKERRQ(ierr); 3033 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetUseExactDirichlet_C",PCBDDCSetUseExactDirichlet_BDDC);CHKERRQ(ierr); 3034 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLevels_C",PCBDDCSetLevels_BDDC);CHKERRQ(ierr); 3035 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDirichletBoundaries_C",PCBDDCSetDirichletBoundaries_BDDC);CHKERRQ(ierr); 3036 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDirichletBoundariesLocal_C",PCBDDCSetDirichletBoundariesLocal_BDDC);CHKERRQ(ierr); 3037 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetNeumannBoundaries_C",PCBDDCSetNeumannBoundaries_BDDC);CHKERRQ(ierr); 3038 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetNeumannBoundariesLocal_C",PCBDDCSetNeumannBoundariesLocal_BDDC);CHKERRQ(ierr); 3039 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetDirichletBoundaries_C",PCBDDCGetDirichletBoundaries_BDDC);CHKERRQ(ierr); 3040 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetDirichletBoundariesLocal_C",PCBDDCGetDirichletBoundariesLocal_BDDC);CHKERRQ(ierr); 3041 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetNeumannBoundaries_C",PCBDDCGetNeumannBoundaries_BDDC);CHKERRQ(ierr); 3042 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetNeumannBoundariesLocal_C",PCBDDCGetNeumannBoundariesLocal_BDDC);CHKERRQ(ierr); 3043 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDofsSplitting_C",PCBDDCSetDofsSplitting_BDDC);CHKERRQ(ierr); 3044 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDofsSplittingLocal_C",PCBDDCSetDofsSplittingLocal_BDDC);CHKERRQ(ierr); 3045 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLocalAdjacencyGraph_C",PCBDDCSetLocalAdjacencyGraph_BDDC);CHKERRQ(ierr); 3046 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCCreateFETIDPOperators_C",PCBDDCCreateFETIDPOperators_BDDC);CHKERRQ(ierr); 3047 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCMatFETIDPGetRHS_C",PCBDDCMatFETIDPGetRHS_BDDC);CHKERRQ(ierr); 3048 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCMatFETIDPGetSolution_C",PCBDDCMatFETIDPGetSolution_BDDC);CHKERRQ(ierr); 3049 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCPreSolveChangeRHS_C",PCPreSolveChangeRHS_BDDC);CHKERRQ(ierr); 3050 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCSetCoordinates_C",PCSetCoordinates_BDDC);CHKERRQ(ierr); 3051 PetscFunctionReturn(0); 3052 } 3053 3054 /*@C 3055 PCBDDCInitializePackage - This function initializes everything in the PCBDDC package. It is called 3056 from PetscDLLibraryRegister() when using dynamic libraries, and on the first call to PCCreate_BDDC() 3057 when using static libraries. 3058 3059 Level: developer 3060 3061 .keywords: PC, PCBDDC, initialize, package 3062 .seealso: PetscInitialize() 3063 @*/ 3064 PetscErrorCode PCBDDCInitializePackage(void) 3065 { 3066 PetscErrorCode ierr; 3067 int i; 3068 3069 PetscFunctionBegin; 3070 if (PCBDDCPackageInitialized) PetscFunctionReturn(0); 3071 PCBDDCPackageInitialized = PETSC_TRUE; 3072 ierr = PetscRegisterFinalize(PCBDDCFinalizePackage);CHKERRQ(ierr); 3073 3074 /* general events */ 3075 ierr = PetscLogEventRegister("PCBDDCTopo",PC_CLASSID,&PC_BDDC_Topology[0]);CHKERRQ(ierr); 3076 ierr = PetscLogEventRegister("PCBDDCLKSP",PC_CLASSID,&PC_BDDC_LocalSolvers[0]);CHKERRQ(ierr); 3077 ierr = PetscLogEventRegister("PCBDDCLWor",PC_CLASSID,&PC_BDDC_LocalWork[0]);CHKERRQ(ierr); 3078 ierr = PetscLogEventRegister("PCBDDCCorr",PC_CLASSID,&PC_BDDC_CorrectionSetUp[0]);CHKERRQ(ierr); 3079 ierr = PetscLogEventRegister("PCBDDCCSet",PC_CLASSID,&PC_BDDC_CoarseSetUp[0]);CHKERRQ(ierr); 3080 ierr = PetscLogEventRegister("PCBDDCCKSP",PC_CLASSID,&PC_BDDC_CoarseSolver[0]);CHKERRQ(ierr); 3081 ierr = PetscLogEventRegister("PCBDDCAdap",PC_CLASSID,&PC_BDDC_AdaptiveSetUp[0]);CHKERRQ(ierr); 3082 ierr = PetscLogEventRegister("PCBDDCScal",PC_CLASSID,&PC_BDDC_Scaling[0]);CHKERRQ(ierr); 3083 ierr = PetscLogEventRegister("PCBDDCSchr",PC_CLASSID,&PC_BDDC_Schurs[0]);CHKERRQ(ierr); 3084 for (i=1;i<PETSC_PCBDDC_MAXLEVELS;i++) { 3085 char ename[32]; 3086 3087 ierr = PetscSNPrintf(ename,sizeof(ename),"PCBDDCTopo l%02d",i);CHKERRQ(ierr); 3088 ierr = PetscLogEventRegister(ename,PC_CLASSID,&PC_BDDC_Topology[i]);CHKERRQ(ierr); 3089 ierr = PetscSNPrintf(ename,sizeof(ename),"PCBDDCLKSP l%02d",i);CHKERRQ(ierr); 3090 ierr = PetscLogEventRegister(ename,PC_CLASSID,&PC_BDDC_LocalSolvers[i]);CHKERRQ(ierr); 3091 ierr = PetscSNPrintf(ename,sizeof(ename),"PCBDDCLWor l%02d",i);CHKERRQ(ierr); 3092 ierr = PetscLogEventRegister(ename,PC_CLASSID,&PC_BDDC_LocalWork[i]);CHKERRQ(ierr); 3093 ierr = PetscSNPrintf(ename,sizeof(ename),"PCBDDCCorr l%02d",i);CHKERRQ(ierr); 3094 ierr = PetscLogEventRegister(ename,PC_CLASSID,&PC_BDDC_CorrectionSetUp[i]);CHKERRQ(ierr); 3095 ierr = PetscSNPrintf(ename,sizeof(ename),"PCBDDCCSet l%02d",i);CHKERRQ(ierr); 3096 ierr = PetscLogEventRegister(ename,PC_CLASSID,&PC_BDDC_CoarseSetUp[i]);CHKERRQ(ierr); 3097 ierr = PetscSNPrintf(ename,sizeof(ename),"PCBDDCCKSP l%02d",i);CHKERRQ(ierr); 3098 ierr = PetscLogEventRegister(ename,PC_CLASSID,&PC_BDDC_CoarseSolver[i]);CHKERRQ(ierr); 3099 ierr = PetscSNPrintf(ename,sizeof(ename),"PCBDDCAdap l%02d",i);CHKERRQ(ierr); 3100 ierr = PetscLogEventRegister(ename,PC_CLASSID,&PC_BDDC_AdaptiveSetUp[i]);CHKERRQ(ierr); 3101 ierr = PetscSNPrintf(ename,sizeof(ename),"PCBDDCScal l%02d",i);CHKERRQ(ierr); 3102 ierr = PetscLogEventRegister(ename,PC_CLASSID,&PC_BDDC_Scaling[i]);CHKERRQ(ierr); 3103 ierr = PetscSNPrintf(ename,sizeof(ename),"PCBDDCSchr l%02d",i);CHKERRQ(ierr); 3104 ierr = PetscLogEventRegister(ename,PC_CLASSID,&PC_BDDC_Schurs[i]);CHKERRQ(ierr); 3105 } 3106 PetscFunctionReturn(0); 3107 } 3108 3109 /*@C 3110 PCBDDCFinalizePackage - This function frees everything from the PCBDDC package. It is 3111 called from PetscFinalize() automatically. 3112 3113 Level: developer 3114 3115 .keywords: Petsc, destroy, package 3116 .seealso: PetscFinalize() 3117 @*/ 3118 PetscErrorCode PCBDDCFinalizePackage(void) 3119 { 3120 PetscFunctionBegin; 3121 PCBDDCPackageInitialized = PETSC_FALSE; 3122 PetscFunctionReturn(0); 3123 } 3124