1 /* TODOLIST 2 3 ConstraintsSetup 4 - tolerances for constraints as an option (take care of single precision!) 5 6 Solvers 7 - Add support for cholesky for coarse solver (similar to local solvers) 8 - Propagate ksp prefixes for solvers to mat objects? 9 - Propagate nearnullspace info among levels 10 11 User interface 12 - ** DofSplitting and DM attached to pc? 13 14 Debugging output 15 - * Better management of verbosity levels of debugging output 16 17 Build 18 - make runexe59 19 20 Extra 21 - *** Is it possible to work with PCBDDCGraph on boundary indices only (less memory consumed)? 22 - Change of basis approach does not work with my nonlinear mechanics example. why? (seems not an issue with l2gmap) 23 - BDDC with MG framework? 24 25 FETIDP 26 - Move FETIDP code to its own classes 27 28 MATIS related operations contained in BDDC code 29 - Provide general case for subassembling 30 - *** Preallocation routines in MatISGetMPIAXAIJ 31 32 */ 33 34 /* ---------------------------------------------------------------------------------------------------------------------------------------------- 35 Implementation of BDDC preconditioner based on: 36 C. Dohrmann "An approximate BDDC preconditioner", Numerical Linear Algebra with Applications Volume 14, Issue 2, pages 149-168, March 2007 37 ---------------------------------------------------------------------------------------------------------------------------------------------- */ 38 39 #include <../src/ksp/pc/impls/bddc/bddc.h> /*I "petscpc.h" I*/ /* includes for fortran wrappers */ 40 #include <../src/ksp/pc/impls/bddc/bddcprivate.h> 41 #include <petscblaslapack.h> 42 43 /* -------------------------------------------------------------------------- */ 44 #undef __FUNCT__ 45 #define __FUNCT__ "PCSetFromOptions_BDDC" 46 PetscErrorCode PCSetFromOptions_BDDC(PetscOptions *PetscOptionsObject,PC pc) 47 { 48 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 49 PetscErrorCode ierr; 50 51 PetscFunctionBegin; 52 ierr = PetscOptionsHead(PetscOptionsObject,"BDDC options");CHKERRQ(ierr); 53 /* Verbose debugging */ 54 ierr = PetscOptionsInt("-pc_bddc_check_level","Verbose output for PCBDDC (intended for debug)","none",pcbddc->dbg_flag,&pcbddc->dbg_flag,NULL);CHKERRQ(ierr); 55 /* Primal space cumstomization */ 56 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); 57 ierr = PetscOptionsBool("-pc_bddc_use_vertices","Use or not corner dofs in coarse space","none",pcbddc->use_vertices,&pcbddc->use_vertices,NULL);CHKERRQ(ierr); 58 ierr = PetscOptionsBool("-pc_bddc_use_edges","Use or not edge constraints in coarse space","none",pcbddc->use_edges,&pcbddc->use_edges,NULL);CHKERRQ(ierr); 59 ierr = PetscOptionsBool("-pc_bddc_use_faces","Use or not face constraints in coarse space","none",pcbddc->use_faces,&pcbddc->use_faces,NULL);CHKERRQ(ierr); 60 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); 61 ierr = PetscOptionsBool("-pc_bddc_use_qr_single","Use QR factorization for single constraints on cc (QR is always used for multiple constraints on the same cc)","none",pcbddc->use_qr_single,&pcbddc->use_qr_single,NULL);CHKERRQ(ierr); 62 /* Change of basis */ 63 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); 64 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); 65 if (!pcbddc->use_change_of_basis) { 66 pcbddc->use_change_on_faces = PETSC_FALSE; 67 } 68 /* Switch between M_2 (default) and M_3 preconditioners (as defined by C. Dohrmann in the ref. article) */ 69 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); 70 ierr = PetscOptionsInt("-pc_bddc_coarse_redistribute","Number of procs where to redistribute coarse problem","none",pcbddc->redistribute_coarse,&pcbddc->redistribute_coarse,NULL);CHKERRQ(ierr); 71 ierr = PetscOptionsInt("-pc_bddc_coarsening_ratio","Set coarsening ratio used in multilevel coarsening","none",pcbddc->coarsening_ratio,&pcbddc->coarsening_ratio,NULL);CHKERRQ(ierr); 72 ierr = PetscOptionsInt("-pc_bddc_levels","Set maximum number of levels for multilevel","none",pcbddc->max_levels,&pcbddc->max_levels,NULL);CHKERRQ(ierr); 73 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); 74 ierr = PetscOptionsBool("-pc_bddc_use_deluxe_scaling","Use deluxe scaling for BDDC","none",pcbddc->use_deluxe_scaling,&pcbddc->use_deluxe_scaling,NULL);CHKERRQ(ierr); 75 ierr = PetscOptionsInt("-pc_bddc_schur_threshold","Schur principal minors smaller than this value are explicilty computed (-1 computes all)","none",pcbddc->sub_schurs_threshold,&pcbddc->sub_schurs_threshold,NULL);CHKERRQ(ierr); 76 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); 77 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); 78 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); 79 ierr = PetscOptionsReal("-pc_bddc_adaptive_threshold","Threshold to be used for adaptive selection of constraints","none",pcbddc->adaptive_threshold,&pcbddc->adaptive_threshold,NULL);CHKERRQ(ierr); 80 ierr = PetscOptionsInt("-pc_bddc_adaptive_nmin","Minimum number of constraints per connected components","none",pcbddc->adaptive_nmin,&pcbddc->adaptive_nmin,NULL);CHKERRQ(ierr); 81 ierr = PetscOptionsInt("-pc_bddc_adaptive_nmax","Maximum number of constraints per connected components","none",pcbddc->adaptive_nmax,&pcbddc->adaptive_nmax,NULL);CHKERRQ(ierr); 82 ierr = PetscOptionsBool("-pc_bddc_adaptive_invert_stildas","Whether or not to invert the Stildas matrices","none",pcbddc->adaptive_invert_Stildas,&pcbddc->adaptive_invert_Stildas,NULL);CHKERRQ(ierr); 83 ierr = PetscOptionsTail();CHKERRQ(ierr); 84 PetscFunctionReturn(0); 85 } 86 /* -------------------------------------------------------------------------- */ 87 #undef __FUNCT__ 88 #define __FUNCT__ "PCBDDCSetChangeOfBasisMat_BDDC" 89 static PetscErrorCode PCBDDCSetChangeOfBasisMat_BDDC(PC pc, Mat change) 90 { 91 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 92 PetscErrorCode ierr; 93 94 PetscFunctionBegin; 95 ierr = MatDestroy(&pcbddc->user_ChangeOfBasisMatrix);CHKERRQ(ierr); 96 ierr = PetscObjectReference((PetscObject)change);CHKERRQ(ierr); 97 pcbddc->user_ChangeOfBasisMatrix = change; 98 PetscFunctionReturn(0); 99 } 100 #undef __FUNCT__ 101 #define __FUNCT__ "PCBDDCSetChangeOfBasisMat" 102 /*@ 103 PCBDDCSetChangeOfBasisMat - Set user defined change of basis for dofs 104 105 Collective on PC 106 107 Input Parameters: 108 + pc - the preconditioning context 109 - change - the change of basis matrix 110 111 Level: intermediate 112 113 Notes: 114 115 .seealso: PCBDDC 116 @*/ 117 PetscErrorCode PCBDDCSetChangeOfBasisMat(PC pc, Mat change) 118 { 119 PetscErrorCode ierr; 120 121 PetscFunctionBegin; 122 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 123 PetscValidHeaderSpecific(change,MAT_CLASSID,2); 124 PetscCheckSameComm(pc,1,change,2); 125 if (pc->mat) { 126 PetscInt rows_c,cols_c,rows,cols; 127 ierr = MatGetSize(pc->mat,&rows,&cols);CHKERRQ(ierr); 128 ierr = MatGetSize(change,&rows_c,&cols_c);CHKERRQ(ierr); 129 if (rows_c != rows) { 130 SETERRQ2(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Invalid number of rows for change of basis matrix! %d != %d",rows_c,rows); 131 } 132 if (cols_c != cols) { 133 SETERRQ2(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Invalid number of columns for change of basis matrix! %d != %d",cols_c,cols); 134 } 135 ierr = MatGetLocalSize(pc->mat,&rows,&cols);CHKERRQ(ierr); 136 ierr = MatGetLocalSize(change,&rows_c,&cols_c);CHKERRQ(ierr); 137 if (rows_c != rows) { 138 SETERRQ2(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Invalid number of local rows for change of basis matrix! %d != %d",rows_c,rows); 139 } 140 if (cols_c != cols) { 141 SETERRQ2(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Invalid number of local columns for change of basis matrix! %d != %d",cols_c,cols); 142 } 143 } 144 ierr = PetscTryMethod(pc,"PCBDDCSetChangeOfBasisMat_C",(PC,Mat),(pc,change));CHKERRQ(ierr); 145 PetscFunctionReturn(0); 146 } 147 /* -------------------------------------------------------------------------- */ 148 #undef __FUNCT__ 149 #define __FUNCT__ "PCBDDCSetPrimalVerticesLocalIS_BDDC" 150 static PetscErrorCode PCBDDCSetPrimalVerticesLocalIS_BDDC(PC pc, IS PrimalVertices) 151 { 152 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 153 PetscErrorCode ierr; 154 155 PetscFunctionBegin; 156 ierr = ISDestroy(&pcbddc->user_primal_vertices);CHKERRQ(ierr); 157 ierr = PetscObjectReference((PetscObject)PrimalVertices);CHKERRQ(ierr); 158 pcbddc->user_primal_vertices = PrimalVertices; 159 PetscFunctionReturn(0); 160 } 161 #undef __FUNCT__ 162 #define __FUNCT__ "PCBDDCSetPrimalVerticesLocalIS" 163 /*@ 164 PCBDDCSetPrimalVerticesLocalIS - Set additional user defined primal vertices in PCBDDC 165 166 Not collective 167 168 Input Parameters: 169 + pc - the preconditioning context 170 - PrimalVertices - index set of primal vertices in local numbering 171 172 Level: intermediate 173 174 Notes: 175 176 .seealso: PCBDDC 177 @*/ 178 PetscErrorCode PCBDDCSetPrimalVerticesLocalIS(PC pc, IS PrimalVertices) 179 { 180 PetscErrorCode ierr; 181 182 PetscFunctionBegin; 183 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 184 PetscValidHeaderSpecific(PrimalVertices,IS_CLASSID,2); 185 ierr = PetscTryMethod(pc,"PCBDDCSetPrimalVerticesLocalIS_C",(PC,IS),(pc,PrimalVertices));CHKERRQ(ierr); 186 PetscFunctionReturn(0); 187 } 188 /* -------------------------------------------------------------------------- */ 189 #undef __FUNCT__ 190 #define __FUNCT__ "PCBDDCSetCoarseningRatio_BDDC" 191 static PetscErrorCode PCBDDCSetCoarseningRatio_BDDC(PC pc,PetscInt k) 192 { 193 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 194 195 PetscFunctionBegin; 196 pcbddc->coarsening_ratio = k; 197 PetscFunctionReturn(0); 198 } 199 200 #undef __FUNCT__ 201 #define __FUNCT__ "PCBDDCSetCoarseningRatio" 202 /*@ 203 PCBDDCSetCoarseningRatio - Set coarsening ratio used in multilevel 204 205 Logically collective on PC 206 207 Input Parameters: 208 + pc - the preconditioning context 209 - k - coarsening ratio (H/h at the coarser level) 210 211 Approximatively k subdomains at the finer level will be aggregated into a single subdomain at the coarser level 212 213 Level: intermediate 214 215 Notes: 216 217 .seealso: PCBDDC 218 @*/ 219 PetscErrorCode PCBDDCSetCoarseningRatio(PC pc,PetscInt k) 220 { 221 PetscErrorCode ierr; 222 223 PetscFunctionBegin; 224 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 225 PetscValidLogicalCollectiveInt(pc,k,2); 226 ierr = PetscTryMethod(pc,"PCBDDCSetCoarseningRatio_C",(PC,PetscInt),(pc,k));CHKERRQ(ierr); 227 PetscFunctionReturn(0); 228 } 229 230 /* The following functions (PCBDDCSetUseExactDirichlet PCBDDCSetLevel) are not public */ 231 #undef __FUNCT__ 232 #define __FUNCT__ "PCBDDCSetUseExactDirichlet_BDDC" 233 static PetscErrorCode PCBDDCSetUseExactDirichlet_BDDC(PC pc,PetscBool flg) 234 { 235 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 236 237 PetscFunctionBegin; 238 pcbddc->use_exact_dirichlet_trick = flg; 239 PetscFunctionReturn(0); 240 } 241 242 #undef __FUNCT__ 243 #define __FUNCT__ "PCBDDCSetUseExactDirichlet" 244 PetscErrorCode PCBDDCSetUseExactDirichlet(PC pc,PetscBool flg) 245 { 246 PetscErrorCode ierr; 247 248 PetscFunctionBegin; 249 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 250 PetscValidLogicalCollectiveBool(pc,flg,2); 251 ierr = PetscTryMethod(pc,"PCBDDCSetUseExactDirichlet_C",(PC,PetscBool),(pc,flg));CHKERRQ(ierr); 252 PetscFunctionReturn(0); 253 } 254 255 #undef __FUNCT__ 256 #define __FUNCT__ "PCBDDCSetLevel_BDDC" 257 static PetscErrorCode PCBDDCSetLevel_BDDC(PC pc,PetscInt level) 258 { 259 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 260 261 PetscFunctionBegin; 262 pcbddc->current_level = level; 263 PetscFunctionReturn(0); 264 } 265 266 #undef __FUNCT__ 267 #define __FUNCT__ "PCBDDCSetLevel" 268 PetscErrorCode PCBDDCSetLevel(PC pc,PetscInt level) 269 { 270 PetscErrorCode ierr; 271 272 PetscFunctionBegin; 273 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 274 PetscValidLogicalCollectiveInt(pc,level,2); 275 ierr = PetscTryMethod(pc,"PCBDDCSetLevel_C",(PC,PetscInt),(pc,level));CHKERRQ(ierr); 276 PetscFunctionReturn(0); 277 } 278 279 #undef __FUNCT__ 280 #define __FUNCT__ "PCBDDCSetLevels_BDDC" 281 static PetscErrorCode PCBDDCSetLevels_BDDC(PC pc,PetscInt levels) 282 { 283 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 284 285 PetscFunctionBegin; 286 pcbddc->max_levels = levels; 287 PetscFunctionReturn(0); 288 } 289 290 #undef __FUNCT__ 291 #define __FUNCT__ "PCBDDCSetLevels" 292 /*@ 293 PCBDDCSetLevels - Sets the maximum number of levels for multilevel 294 295 Logically collective on PC 296 297 Input Parameters: 298 + pc - the preconditioning context 299 - levels - the maximum number of levels (max 9) 300 301 Default value is 0, i.e. traditional one-level BDDC 302 303 Level: intermediate 304 305 Notes: 306 307 .seealso: PCBDDC 308 @*/ 309 PetscErrorCode PCBDDCSetLevels(PC pc,PetscInt levels) 310 { 311 PetscErrorCode ierr; 312 313 PetscFunctionBegin; 314 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 315 PetscValidLogicalCollectiveInt(pc,levels,2); 316 if (levels > 99) SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_SUP,"Maximum number of levels for bddc is 99\n"); 317 ierr = PetscTryMethod(pc,"PCBDDCSetLevels_C",(PC,PetscInt),(pc,levels));CHKERRQ(ierr); 318 PetscFunctionReturn(0); 319 } 320 /* -------------------------------------------------------------------------- */ 321 322 #undef __FUNCT__ 323 #define __FUNCT__ "PCBDDCSetNullSpace_BDDC" 324 static PetscErrorCode PCBDDCSetNullSpace_BDDC(PC pc,MatNullSpace NullSpace) 325 { 326 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 327 PetscErrorCode ierr; 328 329 PetscFunctionBegin; 330 ierr = PetscObjectReference((PetscObject)NullSpace);CHKERRQ(ierr); 331 ierr = MatNullSpaceDestroy(&pcbddc->NullSpace);CHKERRQ(ierr); 332 pcbddc->NullSpace = NullSpace; 333 PetscFunctionReturn(0); 334 } 335 336 #undef __FUNCT__ 337 #define __FUNCT__ "PCBDDCSetNullSpace" 338 /*@ 339 PCBDDCSetNullSpace - Set nullspace for BDDC operator 340 341 Logically collective on PC and MatNullSpace 342 343 Input Parameters: 344 + pc - the preconditioning context 345 - NullSpace - Null space of the linear operator to be preconditioned (Pmat) 346 347 Level: intermediate 348 349 Notes: 350 351 .seealso: PCBDDC 352 @*/ 353 PetscErrorCode PCBDDCSetNullSpace(PC pc,MatNullSpace NullSpace) 354 { 355 PetscErrorCode ierr; 356 357 PetscFunctionBegin; 358 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 359 PetscValidHeaderSpecific(NullSpace,MAT_NULLSPACE_CLASSID,2); 360 PetscCheckSameComm(pc,1,NullSpace,2); 361 ierr = PetscTryMethod(pc,"PCBDDCSetNullSpace_C",(PC,MatNullSpace),(pc,NullSpace));CHKERRQ(ierr); 362 PetscFunctionReturn(0); 363 } 364 /* -------------------------------------------------------------------------- */ 365 366 #undef __FUNCT__ 367 #define __FUNCT__ "PCBDDCSetDirichletBoundaries_BDDC" 368 static PetscErrorCode PCBDDCSetDirichletBoundaries_BDDC(PC pc,IS DirichletBoundaries) 369 { 370 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 371 PetscErrorCode ierr; 372 373 PetscFunctionBegin; 374 /* last user setting takes precendence -> destroy any other customization */ 375 ierr = ISDestroy(&pcbddc->DirichletBoundariesLocal);CHKERRQ(ierr); 376 ierr = ISDestroy(&pcbddc->DirichletBoundaries);CHKERRQ(ierr); 377 ierr = PetscObjectReference((PetscObject)DirichletBoundaries);CHKERRQ(ierr); 378 pcbddc->DirichletBoundaries = DirichletBoundaries; 379 pcbddc->recompute_topography = PETSC_TRUE; 380 PetscFunctionReturn(0); 381 } 382 383 #undef __FUNCT__ 384 #define __FUNCT__ "PCBDDCSetDirichletBoundaries" 385 /*@ 386 PCBDDCSetDirichletBoundaries - Set IS defining Dirichlet boundaries for the global problem. 387 388 Collective 389 390 Input Parameters: 391 + pc - the preconditioning context 392 - DirichletBoundaries - parallel IS defining the Dirichlet boundaries 393 394 Level: intermediate 395 396 Notes: Any process can list any global node 397 398 .seealso: PCBDDC 399 @*/ 400 PetscErrorCode PCBDDCSetDirichletBoundaries(PC pc,IS DirichletBoundaries) 401 { 402 PetscErrorCode ierr; 403 404 PetscFunctionBegin; 405 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 406 PetscValidHeaderSpecific(DirichletBoundaries,IS_CLASSID,2); 407 PetscCheckSameComm(pc,1,DirichletBoundaries,2); 408 ierr = PetscTryMethod(pc,"PCBDDCSetDirichletBoundaries_C",(PC,IS),(pc,DirichletBoundaries));CHKERRQ(ierr); 409 PetscFunctionReturn(0); 410 } 411 /* -------------------------------------------------------------------------- */ 412 413 #undef __FUNCT__ 414 #define __FUNCT__ "PCBDDCSetDirichletBoundariesLocal_BDDC" 415 static PetscErrorCode PCBDDCSetDirichletBoundariesLocal_BDDC(PC pc,IS DirichletBoundaries) 416 { 417 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 418 PetscErrorCode ierr; 419 420 PetscFunctionBegin; 421 /* last user setting takes precendence -> destroy any other customization */ 422 ierr = ISDestroy(&pcbddc->DirichletBoundariesLocal);CHKERRQ(ierr); 423 ierr = ISDestroy(&pcbddc->DirichletBoundaries);CHKERRQ(ierr); 424 ierr = PetscObjectReference((PetscObject)DirichletBoundaries);CHKERRQ(ierr); 425 pcbddc->DirichletBoundariesLocal = DirichletBoundaries; 426 pcbddc->recompute_topography = PETSC_TRUE; 427 PetscFunctionReturn(0); 428 } 429 430 #undef __FUNCT__ 431 #define __FUNCT__ "PCBDDCSetDirichletBoundariesLocal" 432 /*@ 433 PCBDDCSetDirichletBoundariesLocal - Set IS defining Dirichlet boundaries for the global problem in local ordering. 434 435 Collective 436 437 Input Parameters: 438 + pc - the preconditioning context 439 - DirichletBoundaries - parallel IS defining the Dirichlet boundaries (in local ordering) 440 441 Level: intermediate 442 443 Notes: 444 445 .seealso: PCBDDC 446 @*/ 447 PetscErrorCode PCBDDCSetDirichletBoundariesLocal(PC pc,IS DirichletBoundaries) 448 { 449 PetscErrorCode ierr; 450 451 PetscFunctionBegin; 452 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 453 PetscValidHeaderSpecific(DirichletBoundaries,IS_CLASSID,2); 454 PetscCheckSameComm(pc,1,DirichletBoundaries,2); 455 ierr = PetscTryMethod(pc,"PCBDDCSetDirichletBoundariesLocal_C",(PC,IS),(pc,DirichletBoundaries));CHKERRQ(ierr); 456 PetscFunctionReturn(0); 457 } 458 /* -------------------------------------------------------------------------- */ 459 460 #undef __FUNCT__ 461 #define __FUNCT__ "PCBDDCSetNeumannBoundaries_BDDC" 462 static PetscErrorCode PCBDDCSetNeumannBoundaries_BDDC(PC pc,IS NeumannBoundaries) 463 { 464 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 465 PetscErrorCode ierr; 466 467 PetscFunctionBegin; 468 /* last user setting takes precendence -> destroy any other customization */ 469 ierr = ISDestroy(&pcbddc->NeumannBoundariesLocal);CHKERRQ(ierr); 470 ierr = ISDestroy(&pcbddc->NeumannBoundaries);CHKERRQ(ierr); 471 ierr = PetscObjectReference((PetscObject)NeumannBoundaries);CHKERRQ(ierr); 472 pcbddc->NeumannBoundaries = NeumannBoundaries; 473 pcbddc->recompute_topography = PETSC_TRUE; 474 PetscFunctionReturn(0); 475 } 476 477 #undef __FUNCT__ 478 #define __FUNCT__ "PCBDDCSetNeumannBoundaries" 479 /*@ 480 PCBDDCSetNeumannBoundaries - Set IS defining Neumann boundaries for the global problem. 481 482 Collective 483 484 Input Parameters: 485 + pc - the preconditioning context 486 - NeumannBoundaries - parallel IS defining the Neumann boundaries 487 488 Level: intermediate 489 490 Notes: Any process can list any global node 491 492 .seealso: PCBDDC 493 @*/ 494 PetscErrorCode PCBDDCSetNeumannBoundaries(PC pc,IS NeumannBoundaries) 495 { 496 PetscErrorCode ierr; 497 498 PetscFunctionBegin; 499 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 500 PetscValidHeaderSpecific(NeumannBoundaries,IS_CLASSID,2); 501 PetscCheckSameComm(pc,1,NeumannBoundaries,2); 502 ierr = PetscTryMethod(pc,"PCBDDCSetNeumannBoundaries_C",(PC,IS),(pc,NeumannBoundaries));CHKERRQ(ierr); 503 PetscFunctionReturn(0); 504 } 505 /* -------------------------------------------------------------------------- */ 506 507 #undef __FUNCT__ 508 #define __FUNCT__ "PCBDDCSetNeumannBoundariesLocal_BDDC" 509 static PetscErrorCode PCBDDCSetNeumannBoundariesLocal_BDDC(PC pc,IS NeumannBoundaries) 510 { 511 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 512 PetscErrorCode ierr; 513 514 PetscFunctionBegin; 515 /* last user setting takes precendence -> destroy any other customization */ 516 ierr = ISDestroy(&pcbddc->NeumannBoundariesLocal);CHKERRQ(ierr); 517 ierr = ISDestroy(&pcbddc->NeumannBoundaries);CHKERRQ(ierr); 518 ierr = PetscObjectReference((PetscObject)NeumannBoundaries);CHKERRQ(ierr); 519 pcbddc->NeumannBoundariesLocal = NeumannBoundaries; 520 pcbddc->recompute_topography = PETSC_TRUE; 521 PetscFunctionReturn(0); 522 } 523 524 #undef __FUNCT__ 525 #define __FUNCT__ "PCBDDCSetNeumannBoundariesLocal" 526 /*@ 527 PCBDDCSetNeumannBoundariesLocal - Set IS defining Neumann boundaries for the global problem in local ordering. 528 529 Collective 530 531 Input Parameters: 532 + pc - the preconditioning context 533 - NeumannBoundaries - parallel IS defining the subdomain part of Neumann boundaries (in local ordering) 534 535 Level: intermediate 536 537 Notes: 538 539 .seealso: PCBDDC 540 @*/ 541 PetscErrorCode PCBDDCSetNeumannBoundariesLocal(PC pc,IS NeumannBoundaries) 542 { 543 PetscErrorCode ierr; 544 545 PetscFunctionBegin; 546 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 547 PetscValidHeaderSpecific(NeumannBoundaries,IS_CLASSID,2); 548 PetscCheckSameComm(pc,1,NeumannBoundaries,2); 549 ierr = PetscTryMethod(pc,"PCBDDCSetNeumannBoundariesLocal_C",(PC,IS),(pc,NeumannBoundaries));CHKERRQ(ierr); 550 PetscFunctionReturn(0); 551 } 552 /* -------------------------------------------------------------------------- */ 553 554 #undef __FUNCT__ 555 #define __FUNCT__ "PCBDDCGetDirichletBoundaries_BDDC" 556 static PetscErrorCode PCBDDCGetDirichletBoundaries_BDDC(PC pc,IS *DirichletBoundaries) 557 { 558 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 559 560 PetscFunctionBegin; 561 *DirichletBoundaries = pcbddc->DirichletBoundaries; 562 PetscFunctionReturn(0); 563 } 564 565 #undef __FUNCT__ 566 #define __FUNCT__ "PCBDDCGetDirichletBoundaries" 567 /*@ 568 PCBDDCGetDirichletBoundaries - Get parallel IS for Dirichlet boundaries 569 570 Collective 571 572 Input Parameters: 573 . pc - the preconditioning context 574 575 Output Parameters: 576 . DirichletBoundaries - index set defining the Dirichlet boundaries 577 578 Level: intermediate 579 580 Notes: The IS returned (if any) is the same passed in earlier by the user with PCBDDCSetDirichletBoundaries 581 582 .seealso: PCBDDC 583 @*/ 584 PetscErrorCode PCBDDCGetDirichletBoundaries(PC pc,IS *DirichletBoundaries) 585 { 586 PetscErrorCode ierr; 587 588 PetscFunctionBegin; 589 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 590 ierr = PetscUseMethod(pc,"PCBDDCGetDirichletBoundaries_C",(PC,IS*),(pc,DirichletBoundaries));CHKERRQ(ierr); 591 PetscFunctionReturn(0); 592 } 593 /* -------------------------------------------------------------------------- */ 594 595 #undef __FUNCT__ 596 #define __FUNCT__ "PCBDDCGetDirichletBoundariesLocal_BDDC" 597 static PetscErrorCode PCBDDCGetDirichletBoundariesLocal_BDDC(PC pc,IS *DirichletBoundaries) 598 { 599 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 600 601 PetscFunctionBegin; 602 *DirichletBoundaries = pcbddc->DirichletBoundariesLocal; 603 PetscFunctionReturn(0); 604 } 605 606 #undef __FUNCT__ 607 #define __FUNCT__ "PCBDDCGetDirichletBoundariesLocal" 608 /*@ 609 PCBDDCGetDirichletBoundariesLocal - Get parallel IS for Dirichlet boundaries (in local ordering) 610 611 Collective 612 613 Input Parameters: 614 . pc - the preconditioning context 615 616 Output Parameters: 617 . DirichletBoundaries - index set defining the subdomain part of Dirichlet boundaries 618 619 Level: intermediate 620 621 Notes: 622 623 .seealso: PCBDDC 624 @*/ 625 PetscErrorCode PCBDDCGetDirichletBoundariesLocal(PC pc,IS *DirichletBoundaries) 626 { 627 PetscErrorCode ierr; 628 629 PetscFunctionBegin; 630 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 631 ierr = PetscUseMethod(pc,"PCBDDCGetDirichletBoundariesLocal_C",(PC,IS*),(pc,DirichletBoundaries));CHKERRQ(ierr); 632 PetscFunctionReturn(0); 633 } 634 /* -------------------------------------------------------------------------- */ 635 636 #undef __FUNCT__ 637 #define __FUNCT__ "PCBDDCGetNeumannBoundaries_BDDC" 638 static PetscErrorCode PCBDDCGetNeumannBoundaries_BDDC(PC pc,IS *NeumannBoundaries) 639 { 640 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 641 642 PetscFunctionBegin; 643 *NeumannBoundaries = pcbddc->NeumannBoundaries; 644 PetscFunctionReturn(0); 645 } 646 647 #undef __FUNCT__ 648 #define __FUNCT__ "PCBDDCGetNeumannBoundaries" 649 /*@ 650 PCBDDCGetNeumannBoundaries - Get parallel IS for Neumann boundaries 651 652 Collective 653 654 Input Parameters: 655 . pc - the preconditioning context 656 657 Output Parameters: 658 . NeumannBoundaries - index set defining the Neumann boundaries 659 660 Level: intermediate 661 662 Notes: The IS returned (if any) is the same passed in earlier by the user with PCBDDCSetNeumannBoundaries 663 664 .seealso: PCBDDC 665 @*/ 666 PetscErrorCode PCBDDCGetNeumannBoundaries(PC pc,IS *NeumannBoundaries) 667 { 668 PetscErrorCode ierr; 669 670 PetscFunctionBegin; 671 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 672 ierr = PetscUseMethod(pc,"PCBDDCGetNeumannBoundaries_C",(PC,IS*),(pc,NeumannBoundaries));CHKERRQ(ierr); 673 PetscFunctionReturn(0); 674 } 675 /* -------------------------------------------------------------------------- */ 676 677 #undef __FUNCT__ 678 #define __FUNCT__ "PCBDDCGetNeumannBoundariesLocal_BDDC" 679 static PetscErrorCode PCBDDCGetNeumannBoundariesLocal_BDDC(PC pc,IS *NeumannBoundaries) 680 { 681 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 682 683 PetscFunctionBegin; 684 *NeumannBoundaries = pcbddc->NeumannBoundariesLocal; 685 PetscFunctionReturn(0); 686 } 687 688 #undef __FUNCT__ 689 #define __FUNCT__ "PCBDDCGetNeumannBoundariesLocal" 690 /*@ 691 PCBDDCGetNeumannBoundariesLocal - Get parallel IS for Neumann boundaries (in local ordering) 692 693 Collective 694 695 Input Parameters: 696 . pc - the preconditioning context 697 698 Output Parameters: 699 . NeumannBoundaries - index set defining the subdomain part of Neumann boundaries 700 701 Level: intermediate 702 703 Notes: 704 705 .seealso: PCBDDC 706 @*/ 707 PetscErrorCode PCBDDCGetNeumannBoundariesLocal(PC pc,IS *NeumannBoundaries) 708 { 709 PetscErrorCode ierr; 710 711 PetscFunctionBegin; 712 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 713 ierr = PetscUseMethod(pc,"PCBDDCGetNeumannBoundariesLocal_C",(PC,IS*),(pc,NeumannBoundaries));CHKERRQ(ierr); 714 PetscFunctionReturn(0); 715 } 716 /* -------------------------------------------------------------------------- */ 717 718 #undef __FUNCT__ 719 #define __FUNCT__ "PCBDDCSetLocalAdjacencyGraph_BDDC" 720 static PetscErrorCode PCBDDCSetLocalAdjacencyGraph_BDDC(PC pc, PetscInt nvtxs,const PetscInt xadj[],const PetscInt adjncy[], PetscCopyMode copymode) 721 { 722 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 723 PCBDDCGraph mat_graph = pcbddc->mat_graph; 724 PetscErrorCode ierr; 725 726 PetscFunctionBegin; 727 /* free old CSR */ 728 ierr = PCBDDCGraphResetCSR(mat_graph);CHKERRQ(ierr); 729 /* TODO: PCBDDCGraphSetAdjacency */ 730 /* get CSR into graph structure */ 731 if (copymode == PETSC_COPY_VALUES) { 732 ierr = PetscMalloc1(nvtxs+1,&mat_graph->xadj);CHKERRQ(ierr); 733 ierr = PetscMalloc1(xadj[nvtxs],&mat_graph->adjncy);CHKERRQ(ierr); 734 ierr = PetscMemcpy(mat_graph->xadj,xadj,(nvtxs+1)*sizeof(PetscInt));CHKERRQ(ierr); 735 ierr = PetscMemcpy(mat_graph->adjncy,adjncy,xadj[nvtxs]*sizeof(PetscInt));CHKERRQ(ierr); 736 } else if (copymode == PETSC_OWN_POINTER) { 737 mat_graph->xadj = (PetscInt*)xadj; 738 mat_graph->adjncy = (PetscInt*)adjncy; 739 } 740 mat_graph->nvtxs_csr = nvtxs; 741 PetscFunctionReturn(0); 742 } 743 744 #undef __FUNCT__ 745 #define __FUNCT__ "PCBDDCSetLocalAdjacencyGraph" 746 /*@ 747 PCBDDCSetLocalAdjacencyGraph - Set adjacency structure (CSR graph) of the local Neumann matrix 748 749 Not collective 750 751 Input Parameters: 752 + pc - the preconditioning context 753 . nvtxs - number of local vertices of the graph (i.e., the local size of your problem) 754 . xadj, adjncy - the CSR graph 755 - copymode - either PETSC_COPY_VALUES or PETSC_OWN_POINTER. 756 757 Level: intermediate 758 759 Notes: 760 761 .seealso: PCBDDC,PetscCopyMode 762 @*/ 763 PetscErrorCode PCBDDCSetLocalAdjacencyGraph(PC pc,PetscInt nvtxs,const PetscInt xadj[],const PetscInt adjncy[], PetscCopyMode copymode) 764 { 765 void (*f)(void) = 0; 766 PetscErrorCode ierr; 767 768 PetscFunctionBegin; 769 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 770 PetscValidIntPointer(xadj,3); 771 PetscValidIntPointer(adjncy,4); 772 if (copymode != PETSC_COPY_VALUES && copymode != PETSC_OWN_POINTER) { 773 SETERRQ2(PETSC_COMM_SELF,PETSC_ERR_SUP,"Unsupported copy mode %d in %s\n",copymode,__FUNCT__); 774 } 775 ierr = PetscTryMethod(pc,"PCBDDCSetLocalAdjacencyGraph_C",(PC,PetscInt,const PetscInt[],const PetscInt[],PetscCopyMode),(pc,nvtxs,xadj,adjncy,copymode));CHKERRQ(ierr); 776 /* free arrays if PCBDDC is not the PC type */ 777 ierr = PetscObjectQueryFunction((PetscObject)pc,"PCBDDCSetLocalAdjacencyGraph_C",&f);CHKERRQ(ierr); 778 if (!f && copymode == PETSC_OWN_POINTER) { 779 ierr = PetscFree(xadj);CHKERRQ(ierr); 780 ierr = PetscFree(adjncy);CHKERRQ(ierr); 781 } 782 PetscFunctionReturn(0); 783 } 784 /* -------------------------------------------------------------------------- */ 785 786 #undef __FUNCT__ 787 #define __FUNCT__ "PCBDDCSetDofsSplittingLocal_BDDC" 788 static PetscErrorCode PCBDDCSetDofsSplittingLocal_BDDC(PC pc,PetscInt n_is, IS ISForDofs[]) 789 { 790 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 791 PetscInt i; 792 PetscErrorCode ierr; 793 794 PetscFunctionBegin; 795 /* Destroy ISes if they were already set */ 796 for (i=0;i<pcbddc->n_ISForDofsLocal;i++) { 797 ierr = ISDestroy(&pcbddc->ISForDofsLocal[i]);CHKERRQ(ierr); 798 } 799 ierr = PetscFree(pcbddc->ISForDofsLocal);CHKERRQ(ierr); 800 /* last user setting takes precendence -> destroy any other customization */ 801 for (i=0;i<pcbddc->n_ISForDofs;i++) { 802 ierr = ISDestroy(&pcbddc->ISForDofs[i]);CHKERRQ(ierr); 803 } 804 ierr = PetscFree(pcbddc->ISForDofs);CHKERRQ(ierr); 805 pcbddc->n_ISForDofs = 0; 806 /* allocate space then set */ 807 if (n_is) { 808 ierr = PetscMalloc1(n_is,&pcbddc->ISForDofsLocal);CHKERRQ(ierr); 809 } 810 for (i=0;i<n_is;i++) { 811 ierr = PetscObjectReference((PetscObject)ISForDofs[i]);CHKERRQ(ierr); 812 pcbddc->ISForDofsLocal[i]=ISForDofs[i]; 813 } 814 pcbddc->n_ISForDofsLocal=n_is; 815 if (n_is) pcbddc->user_provided_isfordofs = PETSC_TRUE; 816 pcbddc->recompute_topography = PETSC_TRUE; 817 PetscFunctionReturn(0); 818 } 819 820 #undef __FUNCT__ 821 #define __FUNCT__ "PCBDDCSetDofsSplittingLocal" 822 /*@ 823 PCBDDCSetDofsSplittingLocal - Set index sets defining fields of the local subdomain matrix 824 825 Collective 826 827 Input Parameters: 828 + pc - the preconditioning context 829 - n_is - number of index sets defining the fields 830 . ISForDofs - array of IS describing the fields in local ordering 831 832 Level: intermediate 833 834 Notes: n_is should be the same among processes. Not all nodes need to be listed: unlisted nodes will belong to a different field. 835 836 .seealso: PCBDDC 837 @*/ 838 PetscErrorCode PCBDDCSetDofsSplittingLocal(PC pc,PetscInt n_is, IS ISForDofs[]) 839 { 840 PetscInt i; 841 PetscErrorCode ierr; 842 843 PetscFunctionBegin; 844 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 845 PetscValidLogicalCollectiveInt(pc,n_is,2); 846 for (i=0;i<n_is;i++) { 847 PetscCheckSameComm(pc,1,ISForDofs[i],3); 848 PetscValidHeaderSpecific(ISForDofs[i],IS_CLASSID,3); 849 } 850 ierr = PetscTryMethod(pc,"PCBDDCSetDofsSplittingLocal_C",(PC,PetscInt,IS[]),(pc,n_is,ISForDofs));CHKERRQ(ierr); 851 PetscFunctionReturn(0); 852 } 853 /* -------------------------------------------------------------------------- */ 854 855 #undef __FUNCT__ 856 #define __FUNCT__ "PCBDDCSetDofsSplitting_BDDC" 857 static PetscErrorCode PCBDDCSetDofsSplitting_BDDC(PC pc,PetscInt n_is, IS ISForDofs[]) 858 { 859 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 860 PetscInt i; 861 PetscErrorCode ierr; 862 863 PetscFunctionBegin; 864 /* Destroy ISes if they were already set */ 865 for (i=0;i<pcbddc->n_ISForDofs;i++) { 866 ierr = ISDestroy(&pcbddc->ISForDofs[i]);CHKERRQ(ierr); 867 } 868 ierr = PetscFree(pcbddc->ISForDofs);CHKERRQ(ierr); 869 /* last user setting takes precendence -> destroy any other customization */ 870 for (i=0;i<pcbddc->n_ISForDofsLocal;i++) { 871 ierr = ISDestroy(&pcbddc->ISForDofsLocal[i]);CHKERRQ(ierr); 872 } 873 ierr = PetscFree(pcbddc->ISForDofsLocal);CHKERRQ(ierr); 874 pcbddc->n_ISForDofsLocal = 0; 875 /* allocate space then set */ 876 if (n_is) { 877 ierr = PetscMalloc1(n_is,&pcbddc->ISForDofs);CHKERRQ(ierr); 878 } 879 for (i=0;i<n_is;i++) { 880 ierr = PetscObjectReference((PetscObject)ISForDofs[i]);CHKERRQ(ierr); 881 pcbddc->ISForDofs[i]=ISForDofs[i]; 882 } 883 pcbddc->n_ISForDofs=n_is; 884 if (n_is) pcbddc->user_provided_isfordofs = PETSC_TRUE; 885 pcbddc->recompute_topography = PETSC_TRUE; 886 PetscFunctionReturn(0); 887 } 888 889 #undef __FUNCT__ 890 #define __FUNCT__ "PCBDDCSetDofsSplitting" 891 /*@ 892 PCBDDCSetDofsSplitting - Set index sets defining fields of the global matrix 893 894 Collective 895 896 Input Parameters: 897 + pc - the preconditioning context 898 - n_is - number of index sets defining the fields 899 . ISForDofs - array of IS describing the fields in global ordering 900 901 Level: intermediate 902 903 Notes: Any process can list any global node. Not all nodes need to be listed: unlisted nodes will belong to a different field. 904 905 .seealso: PCBDDC 906 @*/ 907 PetscErrorCode PCBDDCSetDofsSplitting(PC pc,PetscInt n_is, IS ISForDofs[]) 908 { 909 PetscInt i; 910 PetscErrorCode ierr; 911 912 PetscFunctionBegin; 913 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 914 PetscValidLogicalCollectiveInt(pc,n_is,2); 915 for (i=0;i<n_is;i++) { 916 PetscCheckSameComm(pc,1,ISForDofs[i],3); 917 PetscValidHeaderSpecific(ISForDofs[i],IS_CLASSID,3); 918 } 919 ierr = PetscTryMethod(pc,"PCBDDCSetDofsSplitting_C",(PC,PetscInt,IS[]),(pc,n_is,ISForDofs));CHKERRQ(ierr); 920 PetscFunctionReturn(0); 921 } 922 923 /* -------------------------------------------------------------------------- */ 924 #undef __FUNCT__ 925 #define __FUNCT__ "PCPreSolve_BDDC" 926 /* -------------------------------------------------------------------------- */ 927 /* 928 PCPreSolve_BDDC - Changes the right hand side and (if necessary) the initial 929 guess if a transformation of basis approach has been selected. 930 931 Input Parameter: 932 + pc - the preconditioner contex 933 934 Application Interface Routine: PCPreSolve() 935 936 Notes: 937 The interface routine PCPreSolve() is not usually called directly by 938 the user, but instead is called by KSPSolve(). 939 */ 940 static PetscErrorCode PCPreSolve_BDDC(PC pc, KSP ksp, Vec rhs, Vec x) 941 { 942 PetscErrorCode ierr; 943 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 944 PC_IS *pcis = (PC_IS*)(pc->data); 945 Vec used_vec; 946 PetscBool copy_rhs = PETSC_TRUE; 947 948 PetscFunctionBegin; 949 /* if we are working with cg, one dirichlet solve can be avoided during Krylov iterations */ 950 if (ksp) { 951 PetscBool iscg; 952 ierr = PetscObjectTypeCompare((PetscObject)ksp,KSPCG,&iscg);CHKERRQ(ierr); 953 if (!iscg) { 954 ierr = PCBDDCSetUseExactDirichlet(pc,PETSC_FALSE);CHKERRQ(ierr); 955 } 956 } 957 /* Creates parallel work vectors used in presolve */ 958 if (!pcbddc->original_rhs) { 959 ierr = VecDuplicate(pcis->vec1_global,&pcbddc->original_rhs);CHKERRQ(ierr); 960 } 961 if (!pcbddc->temp_solution) { 962 ierr = VecDuplicate(pcis->vec1_global,&pcbddc->temp_solution);CHKERRQ(ierr); 963 } 964 965 if (x) { 966 ierr = PetscObjectReference((PetscObject)x);CHKERRQ(ierr); 967 used_vec = x; 968 } else { /* it can only happen when calling PCBDDCMatFETIDPGetRHS */ 969 ierr = PetscObjectReference((PetscObject)pcbddc->temp_solution);CHKERRQ(ierr); 970 used_vec = pcbddc->temp_solution; 971 ierr = VecSet(used_vec,0.0);CHKERRQ(ierr); 972 } 973 974 /* hack into ksp data structure since PCPreSolve comes earlier than setting to zero the guess in src/ksp/ksp/interface/itfunc.c */ 975 if (ksp) { 976 ierr = KSPGetInitialGuessNonzero(ksp,&pcbddc->ksp_guess_nonzero);CHKERRQ(ierr); 977 if (!pcbddc->ksp_guess_nonzero) { 978 ierr = VecSet(used_vec,0.0);CHKERRQ(ierr); 979 } 980 } 981 982 pcbddc->rhs_change = PETSC_FALSE; 983 984 /* Take into account zeroed rows -> change rhs and store solution removed */ 985 if (rhs && pcbddc->DirichletBoundariesLocal) { 986 IS dirIS = NULL; 987 988 /* DirichletBoundariesLocal may not be consistent among neighbours */ 989 ierr = PCBDDCGraphGetDirichletDofs(pcbddc->mat_graph,&dirIS);CHKERRQ(ierr); 990 if (dirIS) { 991 Mat_IS *matis = (Mat_IS*)pc->pmat->data; 992 PetscInt dirsize,i,*is_indices; 993 PetscScalar *array_x; 994 const PetscScalar *array_diagonal; 995 996 ierr = MatGetDiagonal(pc->pmat,pcis->vec1_global);CHKERRQ(ierr); 997 ierr = VecPointwiseDivide(pcis->vec1_global,rhs,pcis->vec1_global);CHKERRQ(ierr); 998 ierr = VecScatterBegin(matis->ctx,pcis->vec1_global,pcis->vec2_N,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 999 ierr = VecScatterEnd(matis->ctx,pcis->vec1_global,pcis->vec2_N,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1000 ierr = VecScatterBegin(matis->ctx,used_vec,pcis->vec1_N,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1001 ierr = VecScatterEnd(matis->ctx,used_vec,pcis->vec1_N,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1002 ierr = ISGetLocalSize(dirIS,&dirsize);CHKERRQ(ierr); 1003 ierr = VecGetArray(pcis->vec1_N,&array_x);CHKERRQ(ierr); 1004 ierr = VecGetArrayRead(pcis->vec2_N,&array_diagonal);CHKERRQ(ierr); 1005 ierr = ISGetIndices(dirIS,(const PetscInt**)&is_indices);CHKERRQ(ierr); 1006 for (i=0; i<dirsize; i++) array_x[is_indices[i]] = array_diagonal[is_indices[i]]; 1007 ierr = ISRestoreIndices(dirIS,(const PetscInt**)&is_indices);CHKERRQ(ierr); 1008 ierr = VecRestoreArrayRead(pcis->vec2_N,&array_diagonal);CHKERRQ(ierr); 1009 ierr = VecRestoreArray(pcis->vec1_N,&array_x);CHKERRQ(ierr); 1010 ierr = VecScatterBegin(matis->ctx,pcis->vec1_N,used_vec,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1011 ierr = VecScatterEnd(matis->ctx,pcis->vec1_N,used_vec,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1012 pcbddc->rhs_change = PETSC_TRUE; 1013 } 1014 ierr = ISDestroy(&dirIS);CHKERRQ(ierr); 1015 } 1016 1017 /* remove the computed solution or the initial guess from the rhs */ 1018 if (pcbddc->rhs_change || (ksp && pcbddc->ksp_guess_nonzero) ) { 1019 /* store the original rhs */ 1020 if (copy_rhs) { 1021 ierr = VecCopy(rhs,pcbddc->original_rhs);CHKERRQ(ierr); 1022 copy_rhs = PETSC_FALSE; 1023 } 1024 pcbddc->rhs_change = PETSC_TRUE; 1025 ierr = VecScale(used_vec,-1.0);CHKERRQ(ierr); 1026 ierr = MatMultAdd(pc->pmat,used_vec,rhs,rhs);CHKERRQ(ierr); 1027 ierr = VecScale(used_vec,-1.0);CHKERRQ(ierr); 1028 ierr = VecCopy(used_vec,pcbddc->temp_solution);CHKERRQ(ierr); 1029 } 1030 ierr = VecDestroy(&used_vec);CHKERRQ(ierr); 1031 1032 /* store partially computed solution and set initial guess */ 1033 if (x && pcbddc->use_exact_dirichlet_trick) { 1034 ierr = VecSet(x,0.0);CHKERRQ(ierr); 1035 ierr = VecScatterBegin(pcis->global_to_D,rhs,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1036 ierr = VecScatterEnd(pcis->global_to_D,rhs,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1037 ierr = KSPSolve(pcbddc->ksp_D,pcis->vec1_D,pcis->vec2_D);CHKERRQ(ierr); 1038 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec2_D,x,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1039 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec2_D,x,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1040 if (ksp && !pcbddc->ksp_guess_nonzero) { 1041 ierr = KSPSetInitialGuessNonzero(ksp,PETSC_TRUE);CHKERRQ(ierr); 1042 } 1043 } 1044 1045 if (pcbddc->ChangeOfBasisMatrix) { 1046 PCBDDCChange_ctx change_ctx; 1047 1048 /* get change ctx */ 1049 ierr = MatShellGetContext(pcbddc->new_global_mat,&change_ctx);CHKERRQ(ierr); 1050 1051 /* set current iteration matrix inside change context (change of basis has been already set into the ctx during PCSetUp) */ 1052 ierr = MatDestroy(&change_ctx->original_mat);CHKERRQ(ierr); 1053 ierr = PetscObjectReference((PetscObject)pc->mat);CHKERRQ(ierr); 1054 change_ctx->original_mat = pc->mat; 1055 1056 /* change iteration matrix */ 1057 ierr = MatDestroy(&pc->mat);CHKERRQ(ierr); 1058 ierr = PetscObjectReference((PetscObject)pcbddc->new_global_mat);CHKERRQ(ierr); 1059 pc->mat = pcbddc->new_global_mat; 1060 1061 /* store the original rhs */ 1062 if (copy_rhs) { 1063 ierr = VecCopy(rhs,pcbddc->original_rhs);CHKERRQ(ierr); 1064 copy_rhs = PETSC_FALSE; 1065 } 1066 1067 /* change rhs */ 1068 ierr = MatMultTranspose(change_ctx->global_change,rhs,pcis->vec1_global);CHKERRQ(ierr); 1069 ierr = VecCopy(pcis->vec1_global,rhs);CHKERRQ(ierr); 1070 pcbddc->rhs_change = PETSC_TRUE; 1071 } 1072 1073 /* remove nullspace if present */ 1074 if (ksp && x && pcbddc->NullSpace) { 1075 ierr = MatNullSpaceRemove(pcbddc->NullSpace,x);CHKERRQ(ierr); 1076 /* store the original rhs */ 1077 if (copy_rhs) { 1078 ierr = VecCopy(rhs,pcbddc->original_rhs);CHKERRQ(ierr); 1079 copy_rhs = PETSC_FALSE; 1080 } 1081 pcbddc->rhs_change = PETSC_TRUE; 1082 ierr = MatNullSpaceRemove(pcbddc->NullSpace,rhs);CHKERRQ(ierr); 1083 } 1084 PetscFunctionReturn(0); 1085 } 1086 1087 /* -------------------------------------------------------------------------- */ 1088 #undef __FUNCT__ 1089 #define __FUNCT__ "PCPostSolve_BDDC" 1090 /* -------------------------------------------------------------------------- */ 1091 /* 1092 PCPostSolve_BDDC - Changes the computed solution if a transformation of basis 1093 approach has been selected. Also, restores rhs to its original state. 1094 1095 Input Parameter: 1096 + pc - the preconditioner contex 1097 1098 Application Interface Routine: PCPostSolve() 1099 1100 Notes: 1101 The interface routine PCPostSolve() is not usually called directly by 1102 the user, but instead is called by KSPSolve(). 1103 */ 1104 static PetscErrorCode PCPostSolve_BDDC(PC pc, KSP ksp, Vec rhs, Vec x) 1105 { 1106 PetscErrorCode ierr; 1107 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 1108 1109 PetscFunctionBegin; 1110 if (pcbddc->ChangeOfBasisMatrix) { 1111 PCBDDCChange_ctx change_ctx; 1112 1113 /* get change ctx */ 1114 ierr = MatShellGetContext(pcbddc->new_global_mat,&change_ctx);CHKERRQ(ierr); 1115 1116 /* restore iteration matrix */ 1117 ierr = MatDestroy(&pc->mat);CHKERRQ(ierr); 1118 ierr = PetscObjectReference((PetscObject)change_ctx->original_mat);CHKERRQ(ierr); 1119 pc->mat = change_ctx->original_mat; 1120 1121 /* get solution in original basis */ 1122 if (x) { 1123 PC_IS *pcis = (PC_IS*)(pc->data); 1124 ierr = MatMult(change_ctx->global_change,x,pcis->vec1_global);CHKERRQ(ierr); 1125 ierr = VecCopy(pcis->vec1_global,x);CHKERRQ(ierr); 1126 } 1127 } 1128 1129 /* add solution removed in presolve */ 1130 if (x && pcbddc->rhs_change) { 1131 ierr = VecAXPY(x,1.0,pcbddc->temp_solution);CHKERRQ(ierr); 1132 } 1133 1134 /* restore rhs to its original state */ 1135 if (rhs && pcbddc->rhs_change) { 1136 ierr = VecCopy(pcbddc->original_rhs,rhs);CHKERRQ(ierr); 1137 } 1138 pcbddc->rhs_change = PETSC_FALSE; 1139 1140 /* restore ksp guess state */ 1141 if (ksp) { 1142 ierr = KSPSetInitialGuessNonzero(ksp,pcbddc->ksp_guess_nonzero);CHKERRQ(ierr); 1143 } 1144 PetscFunctionReturn(0); 1145 } 1146 /* -------------------------------------------------------------------------- */ 1147 #undef __FUNCT__ 1148 #define __FUNCT__ "PCSetUp_BDDC" 1149 /* -------------------------------------------------------------------------- */ 1150 /* 1151 PCSetUp_BDDC - Prepares for the use of the BDDC preconditioner 1152 by setting data structures and options. 1153 1154 Input Parameter: 1155 + pc - the preconditioner context 1156 1157 Application Interface Routine: PCSetUp() 1158 1159 Notes: 1160 The interface routine PCSetUp() is not usually called directly by 1161 the user, but instead is called by PCApply() if necessary. 1162 */ 1163 PetscErrorCode PCSetUp_BDDC(PC pc) 1164 { 1165 PetscErrorCode ierr; 1166 PC_BDDC* pcbddc = (PC_BDDC*)pc->data; 1167 Mat_IS* matis; 1168 MatNullSpace nearnullspace; 1169 PetscBool computetopography,computesolvers,computesubschurs; 1170 PetscBool computeconstraintsmatrix; 1171 PetscBool new_nearnullspace_provided,ismatis; 1172 1173 PetscFunctionBegin; 1174 ierr = PetscObjectTypeCompare((PetscObject)pc->pmat,MATIS,&ismatis);CHKERRQ(ierr); 1175 if (!ismatis) { 1176 SETERRQ(PetscObjectComm((PetscObject)pc),PETSC_ERR_ARG_WRONG,"PCBDDC preconditioner requires matrix of type MATIS"); 1177 } 1178 matis = (Mat_IS*)pc->pmat->data; 1179 /* the following lines of code should be replaced by a better logic between PCIS, PCNN, PCBDDC and other future nonoverlapping preconditioners */ 1180 /* For BDDC we need to define a local "Neumann" problem different to that defined in PCISSetup 1181 Also, BDDC directly build the Dirichlet problem */ 1182 /* split work */ 1183 if (pc->setupcalled) { 1184 if (pc->flag == SAME_NONZERO_PATTERN) { 1185 computetopography = PETSC_FALSE; 1186 computesolvers = PETSC_TRUE; 1187 } else { /* DIFFERENT_NONZERO_PATTERN */ 1188 computetopography = PETSC_TRUE; 1189 computesolvers = PETSC_TRUE; 1190 } 1191 } else { 1192 computetopography = PETSC_TRUE; 1193 computesolvers = PETSC_TRUE; 1194 } 1195 if (pcbddc->recompute_topography) { 1196 computetopography = PETSC_TRUE; 1197 } 1198 computeconstraintsmatrix = PETSC_FALSE; 1199 pcbddc->adaptive_selection = (PetscBool)(pcbddc->adaptive_threshold > 0.0); 1200 computesubschurs = (PetscBool)(pcbddc->use_deluxe_scaling || pcbddc->adaptive_selection); 1201 1202 /* Get stdout for dbg */ 1203 if (pcbddc->dbg_flag) { 1204 if (!pcbddc->dbg_viewer) { 1205 pcbddc->dbg_viewer = PETSC_VIEWER_STDOUT_(PetscObjectComm((PetscObject)pc)); 1206 ierr = PetscViewerASCIISynchronizedAllow(pcbddc->dbg_viewer,PETSC_TRUE);CHKERRQ(ierr); 1207 } 1208 ierr = PetscViewerASCIIAddTab(pcbddc->dbg_viewer,2*pcbddc->current_level);CHKERRQ(ierr); 1209 } 1210 1211 /*ierr = MatIsSymmetric(pc->pmat,0.,&pcbddc->issym);CHKERRQ(ierr);*/ 1212 { /* this is a temporary workaround since seqbaij matrices does not have support for symmetry checking */ 1213 PetscBool setsym; 1214 ierr = MatIsSymmetricKnown(pc->pmat,&setsym,&pcbddc->issym);CHKERRQ(ierr); 1215 if (!setsym) pcbddc->issym = PETSC_FALSE; 1216 } 1217 1218 if (pcbddc->user_ChangeOfBasisMatrix) { 1219 /* use_change_of_basis flag is used to automatically compute a change of basis from constraints */ 1220 pcbddc->use_change_of_basis = PETSC_FALSE; 1221 ierr = PCBDDCComputeLocalMatrix(pc,pcbddc->user_ChangeOfBasisMatrix);CHKERRQ(ierr); 1222 } else { 1223 ierr = MatDestroy(&pcbddc->local_mat);CHKERRQ(ierr); 1224 ierr = PetscObjectReference((PetscObject)matis->A);CHKERRQ(ierr); 1225 pcbddc->local_mat = matis->A; 1226 } 1227 1228 /* Set up all the "iterative substructuring" common block without computing solvers */ 1229 { 1230 Mat temp_mat; 1231 1232 temp_mat = matis->A; 1233 matis->A = pcbddc->local_mat; 1234 ierr = PCISSetUp(pc,PETSC_FALSE);CHKERRQ(ierr); 1235 pcbddc->local_mat = matis->A; 1236 matis->A = temp_mat; 1237 } 1238 1239 /* Analyze interface and setup sub_schurs data */ 1240 if (computetopography) { 1241 ierr = PCBDDCAnalyzeInterface(pc);CHKERRQ(ierr); 1242 computeconstraintsmatrix = PETSC_TRUE; 1243 } 1244 1245 /* Setup local dirichlet solver ksp_D and sub_schurs solvers */ 1246 if (computesolvers) { 1247 ierr = PCBDDCSetUpLocalSolvers(pc,PETSC_TRUE,PETSC_FALSE);CHKERRQ(ierr); 1248 if (computesubschurs) { 1249 if (computetopography) { 1250 ierr = PCBDDCInitSubSchurs(pc);CHKERRQ(ierr); 1251 } 1252 ierr = PCBDDCSetUpSubSchurs(pc);CHKERRQ(ierr); 1253 if (pcbddc->adaptive_selection) { 1254 ierr = PCBDDCAdaptiveSelection(pc);CHKERRQ(ierr); 1255 computeconstraintsmatrix = PETSC_TRUE; 1256 } 1257 } 1258 } 1259 1260 /* infer if NullSpace object attached to Mat via MatSetNearNullSpace has changed */ 1261 new_nearnullspace_provided = PETSC_FALSE; 1262 ierr = MatGetNearNullSpace(pc->pmat,&nearnullspace);CHKERRQ(ierr); 1263 if (pcbddc->onearnullspace) { /* already used nearnullspace */ 1264 if (!nearnullspace) { /* near null space attached to mat has been destroyed */ 1265 new_nearnullspace_provided = PETSC_TRUE; 1266 } else { 1267 /* determine if the two nullspaces are different (should be lightweight) */ 1268 if (nearnullspace != pcbddc->onearnullspace) { 1269 new_nearnullspace_provided = PETSC_TRUE; 1270 } else { /* maybe the user has changed the content of the nearnullspace so check vectors ObjectStateId */ 1271 PetscInt i; 1272 const Vec *nearnullvecs; 1273 PetscObjectState state; 1274 PetscInt nnsp_size; 1275 ierr = MatNullSpaceGetVecs(nearnullspace,NULL,&nnsp_size,&nearnullvecs);CHKERRQ(ierr); 1276 for (i=0;i<nnsp_size;i++) { 1277 ierr = PetscObjectStateGet((PetscObject)nearnullvecs[i],&state);CHKERRQ(ierr); 1278 if (pcbddc->onearnullvecs_state[i] != state) { 1279 new_nearnullspace_provided = PETSC_TRUE; 1280 break; 1281 } 1282 } 1283 } 1284 } 1285 } else { 1286 if (!nearnullspace) { /* both nearnullspaces are null */ 1287 new_nearnullspace_provided = PETSC_FALSE; 1288 } else { /* nearnullspace attached later */ 1289 new_nearnullspace_provided = PETSC_TRUE; 1290 } 1291 } 1292 1293 /* Setup constraints and related work vectors */ 1294 /* reset primal space flags */ 1295 pcbddc->new_primal_space = PETSC_FALSE; 1296 pcbddc->new_primal_space_local = PETSC_FALSE; 1297 if (computeconstraintsmatrix || new_nearnullspace_provided) { 1298 /* It also sets the primal space flags */ 1299 ierr = PCBDDCConstraintsSetUp(pc);CHKERRQ(ierr); 1300 /* Allocate needed local vectors (which depends on quantities defined during ConstraintsSetUp) */ 1301 ierr = PCBDDCSetUpLocalWorkVectors(pc);CHKERRQ(ierr); 1302 } 1303 1304 if (computesolvers || pcbddc->new_primal_space) { 1305 if (pcbddc->use_change_of_basis) { 1306 PC_IS *pcis = (PC_IS*)(pc->data); 1307 1308 ierr = PCBDDCComputeLocalMatrix(pc,pcbddc->ChangeOfBasisMatrix);CHKERRQ(ierr); 1309 /* get submatrices */ 1310 ierr = MatDestroy(&pcis->A_IB);CHKERRQ(ierr); 1311 ierr = MatDestroy(&pcis->A_BI);CHKERRQ(ierr); 1312 ierr = MatDestroy(&pcis->A_BB);CHKERRQ(ierr); 1313 ierr = MatGetSubMatrix(pcbddc->local_mat,pcis->is_B_local,pcis->is_B_local,MAT_INITIAL_MATRIX,&pcis->A_BB);CHKERRQ(ierr); 1314 ierr = MatGetSubMatrix(pcbddc->local_mat,pcis->is_I_local,pcis->is_B_local,MAT_INITIAL_MATRIX,&pcis->A_IB);CHKERRQ(ierr); 1315 ierr = MatGetSubMatrix(pcbddc->local_mat,pcis->is_B_local,pcis->is_I_local,MAT_INITIAL_MATRIX,&pcis->A_BI);CHKERRQ(ierr); 1316 /* set flag in pcis to not reuse submatrices during PCISCreate */ 1317 pcis->reusesubmatrices = PETSC_FALSE; 1318 } else if (!pcbddc->user_ChangeOfBasisMatrix) { 1319 ierr = MatDestroy(&pcbddc->local_mat);CHKERRQ(ierr); 1320 ierr = PetscObjectReference((PetscObject)matis->A);CHKERRQ(ierr); 1321 pcbddc->local_mat = matis->A; 1322 } 1323 /* SetUp coarse and local Neumann solvers */ 1324 ierr = PCBDDCSetUpSolvers(pc);CHKERRQ(ierr); 1325 /* SetUp Scaling operator */ 1326 ierr = PCBDDCScalingSetUp(pc);CHKERRQ(ierr); 1327 } 1328 1329 if (pcbddc->dbg_flag) { 1330 ierr = PetscViewerASCIISubtractTab(pcbddc->dbg_viewer,2*pcbddc->current_level);CHKERRQ(ierr); 1331 } 1332 PetscFunctionReturn(0); 1333 } 1334 1335 /* -------------------------------------------------------------------------- */ 1336 /* 1337 PCApply_BDDC - Applies the BDDC operator to a vector. 1338 1339 Input Parameters: 1340 . pc - the preconditioner context 1341 . r - input vector (global) 1342 1343 Output Parameter: 1344 . z - output vector (global) 1345 1346 Application Interface Routine: PCApply() 1347 */ 1348 #undef __FUNCT__ 1349 #define __FUNCT__ "PCApply_BDDC" 1350 PetscErrorCode PCApply_BDDC(PC pc,Vec r,Vec z) 1351 { 1352 PC_IS *pcis = (PC_IS*)(pc->data); 1353 PC_BDDC *pcbddc = (PC_BDDC*)(pc->data); 1354 PetscInt n_B = pcis->n_B, n_D = pcis->n - n_B; 1355 PetscErrorCode ierr; 1356 const PetscScalar one = 1.0; 1357 const PetscScalar m_one = -1.0; 1358 const PetscScalar zero = 0.0; 1359 1360 /* This code is similar to that provided in nn.c for PCNN 1361 NN interface preconditioner changed to BDDC 1362 Added support for M_3 preconditioner in the reference article (code is active if pcbddc->switch_static == PETSC_TRUE) */ 1363 1364 PetscFunctionBegin; 1365 if (!pcbddc->use_exact_dirichlet_trick) { 1366 ierr = VecCopy(r,z);CHKERRQ(ierr); 1367 /* First Dirichlet solve */ 1368 ierr = VecScatterBegin(pcis->global_to_D,r,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1369 ierr = VecScatterEnd(pcis->global_to_D,r,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1370 /* 1371 Assembling right hand side for BDDC operator 1372 - pcis->vec1_D for the Dirichlet part (if needed, i.e. pcbddc->switch_static == PETSC_TRUE) 1373 - pcis->vec1_B the interface part of the global vector z 1374 */ 1375 if (n_D) { 1376 ierr = KSPSolve(pcbddc->ksp_D,pcis->vec1_D,pcis->vec2_D);CHKERRQ(ierr); 1377 ierr = VecScale(pcis->vec2_D,m_one);CHKERRQ(ierr); 1378 if (pcbddc->switch_static) { ierr = MatMultAdd(pcis->A_II,pcis->vec2_D,pcis->vec1_D,pcis->vec1_D);CHKERRQ(ierr); } 1379 ierr = MatMult(pcis->A_BI,pcis->vec2_D,pcis->vec1_B);CHKERRQ(ierr); 1380 } else { 1381 ierr = VecSet(pcis->vec1_B,zero);CHKERRQ(ierr); 1382 } 1383 ierr = VecScatterBegin(pcis->global_to_B,pcis->vec1_B,z,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1384 ierr = VecScatterEnd(pcis->global_to_B,pcis->vec1_B,z,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1385 ierr = PCBDDCScalingRestriction(pc,z,pcis->vec1_B);CHKERRQ(ierr); 1386 } else { 1387 if (pcbddc->switch_static) { 1388 ierr = VecSet(pcis->vec1_D,zero);CHKERRQ(ierr); 1389 } 1390 ierr = PCBDDCScalingRestriction(pc,r,pcis->vec1_B);CHKERRQ(ierr); 1391 } 1392 1393 /* Apply interface preconditioner 1394 input/output vecs: pcis->vec1_B and pcis->vec1_D */ 1395 ierr = PCBDDCApplyInterfacePreconditioner(pc,PETSC_FALSE);CHKERRQ(ierr); 1396 1397 /* Apply transpose of partition of unity operator */ 1398 ierr = PCBDDCScalingExtension(pc,pcis->vec1_B,z);CHKERRQ(ierr); 1399 1400 /* Second Dirichlet solve and assembling of output */ 1401 ierr = VecScatterBegin(pcis->global_to_B,z,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1402 ierr = VecScatterEnd(pcis->global_to_B,z,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1403 if (n_B) { 1404 ierr = MatMult(pcis->A_IB,pcis->vec1_B,pcis->vec3_D);CHKERRQ(ierr); 1405 if (pcbddc->switch_static) { ierr = MatMultAdd(pcis->A_II,pcis->vec1_D,pcis->vec3_D,pcis->vec3_D);CHKERRQ(ierr); } 1406 } else if (pcbddc->switch_static) { 1407 ierr = MatMult(pcis->A_II,pcis->vec1_D,pcis->vec3_D);CHKERRQ(ierr); 1408 } 1409 ierr = KSPSolve(pcbddc->ksp_D,pcis->vec3_D,pcis->vec4_D);CHKERRQ(ierr); 1410 if (!pcbddc->use_exact_dirichlet_trick) { 1411 if (pcbddc->switch_static) { 1412 ierr = VecAXPBYPCZ(pcis->vec2_D,m_one,one,m_one,pcis->vec4_D,pcis->vec1_D);CHKERRQ(ierr); 1413 } else { 1414 ierr = VecAXPBY(pcis->vec2_D,m_one,m_one,pcis->vec4_D);CHKERRQ(ierr); 1415 } 1416 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec2_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1417 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec2_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1418 } else { 1419 if (pcbddc->switch_static) { 1420 ierr = VecAXPBY(pcis->vec4_D,one,m_one,pcis->vec1_D);CHKERRQ(ierr); 1421 } else { 1422 ierr = VecScale(pcis->vec4_D,m_one);CHKERRQ(ierr); 1423 } 1424 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec4_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1425 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec4_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1426 } 1427 PetscFunctionReturn(0); 1428 } 1429 1430 /* -------------------------------------------------------------------------- */ 1431 /* 1432 PCApplyTranspose_BDDC - Applies the transpose of the BDDC operator to a vector. 1433 1434 Input Parameters: 1435 . pc - the preconditioner context 1436 . r - input vector (global) 1437 1438 Output Parameter: 1439 . z - output vector (global) 1440 1441 Application Interface Routine: PCApplyTranspose() 1442 */ 1443 #undef __FUNCT__ 1444 #define __FUNCT__ "PCApplyTranspose_BDDC" 1445 PetscErrorCode PCApplyTranspose_BDDC(PC pc,Vec r,Vec z) 1446 { 1447 PC_IS *pcis = (PC_IS*)(pc->data); 1448 PC_BDDC *pcbddc = (PC_BDDC*)(pc->data); 1449 PetscInt n_B = pcis->n_B, n_D = pcis->n - n_B; 1450 PetscErrorCode ierr; 1451 const PetscScalar one = 1.0; 1452 const PetscScalar m_one = -1.0; 1453 const PetscScalar zero = 0.0; 1454 1455 PetscFunctionBegin; 1456 if (!pcbddc->use_exact_dirichlet_trick) { 1457 ierr = VecCopy(r,z);CHKERRQ(ierr); 1458 /* First Dirichlet solve */ 1459 ierr = VecScatterBegin(pcis->global_to_D,r,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1460 ierr = VecScatterEnd(pcis->global_to_D,r,pcis->vec1_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1461 /* 1462 Assembling right hand side for BDDC operator 1463 - pcis->vec1_D for the Dirichlet part (if needed, i.e. pcbddc->switch_static == PETSC_TRUE) 1464 - pcis->vec1_B the interface part of the global vector z 1465 */ 1466 if (n_D) { 1467 ierr = KSPSolveTranspose(pcbddc->ksp_D,pcis->vec1_D,pcis->vec2_D);CHKERRQ(ierr); 1468 ierr = VecScale(pcis->vec2_D,m_one);CHKERRQ(ierr); 1469 if (pcbddc->switch_static) { ierr = MatMultTransposeAdd(pcis->A_II,pcis->vec2_D,pcis->vec1_D,pcis->vec1_D);CHKERRQ(ierr); } 1470 ierr = MatMultTranspose(pcis->A_IB,pcis->vec2_D,pcis->vec1_B);CHKERRQ(ierr); 1471 } else { 1472 ierr = VecSet(pcis->vec1_B,zero);CHKERRQ(ierr); 1473 } 1474 ierr = VecScatterBegin(pcis->global_to_B,pcis->vec1_B,z,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1475 ierr = VecScatterEnd(pcis->global_to_B,pcis->vec1_B,z,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1476 ierr = PCBDDCScalingRestriction(pc,z,pcis->vec1_B);CHKERRQ(ierr); 1477 } else { 1478 if (pcbddc->switch_static) { 1479 ierr = VecSet(pcis->vec1_D,zero);CHKERRQ(ierr); 1480 } 1481 ierr = PCBDDCScalingRestriction(pc,r,pcis->vec1_B);CHKERRQ(ierr); 1482 } 1483 1484 /* Apply interface preconditioner 1485 input/output vecs: pcis->vec1_B and pcis->vec1_D */ 1486 ierr = PCBDDCApplyInterfacePreconditioner(pc,PETSC_TRUE);CHKERRQ(ierr); 1487 1488 /* Apply transpose of partition of unity operator */ 1489 ierr = PCBDDCScalingExtension(pc,pcis->vec1_B,z);CHKERRQ(ierr); 1490 1491 /* Second Dirichlet solve and assembling of output */ 1492 ierr = VecScatterBegin(pcis->global_to_B,z,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1493 ierr = VecScatterEnd(pcis->global_to_B,z,pcis->vec1_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1494 if (n_B) { 1495 ierr = MatMultTranspose(pcis->A_BI,pcis->vec1_B,pcis->vec3_D);CHKERRQ(ierr); 1496 if (pcbddc->switch_static) { ierr = MatMultTransposeAdd(pcis->A_II,pcis->vec1_D,pcis->vec3_D,pcis->vec3_D);CHKERRQ(ierr); } 1497 } else if (pcbddc->switch_static) { 1498 ierr = MatMultTranspose(pcis->A_II,pcis->vec1_D,pcis->vec3_D);CHKERRQ(ierr); 1499 } 1500 ierr = KSPSolveTranspose(pcbddc->ksp_D,pcis->vec3_D,pcis->vec4_D);CHKERRQ(ierr); 1501 if (!pcbddc->use_exact_dirichlet_trick) { 1502 if (pcbddc->switch_static) { 1503 ierr = VecAXPBYPCZ(pcis->vec2_D,m_one,one,m_one,pcis->vec4_D,pcis->vec1_D);CHKERRQ(ierr); 1504 } else { 1505 ierr = VecAXPBY(pcis->vec2_D,m_one,m_one,pcis->vec4_D);CHKERRQ(ierr); 1506 } 1507 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec2_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1508 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec2_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1509 } else { 1510 if (pcbddc->switch_static) { 1511 ierr = VecAXPBY(pcis->vec4_D,one,m_one,pcis->vec1_D);CHKERRQ(ierr); 1512 } else { 1513 ierr = VecScale(pcis->vec4_D,m_one);CHKERRQ(ierr); 1514 } 1515 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec4_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1516 ierr = VecScatterEnd(pcis->global_to_D,pcis->vec4_D,z,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1517 } 1518 PetscFunctionReturn(0); 1519 } 1520 /* -------------------------------------------------------------------------- */ 1521 1522 #undef __FUNCT__ 1523 #define __FUNCT__ "PCDestroy_BDDC" 1524 PetscErrorCode PCDestroy_BDDC(PC pc) 1525 { 1526 PC_BDDC *pcbddc = (PC_BDDC*)pc->data; 1527 PetscErrorCode ierr; 1528 1529 PetscFunctionBegin; 1530 /* free data created by PCIS */ 1531 ierr = PCISDestroy(pc);CHKERRQ(ierr); 1532 /* free BDDC custom data */ 1533 ierr = PCBDDCResetCustomization(pc);CHKERRQ(ierr); 1534 /* destroy objects related to topography */ 1535 ierr = PCBDDCResetTopography(pc);CHKERRQ(ierr); 1536 /* free allocated graph structure */ 1537 ierr = PetscFree(pcbddc->mat_graph);CHKERRQ(ierr); 1538 /* free allocated sub schurs structure */ 1539 ierr = PetscFree(pcbddc->sub_schurs);CHKERRQ(ierr); 1540 /* destroy objects for scaling operator */ 1541 ierr = PCBDDCScalingDestroy(pc);CHKERRQ(ierr); 1542 ierr = PetscFree(pcbddc->deluxe_ctx);CHKERRQ(ierr); 1543 /* free solvers stuff */ 1544 ierr = PCBDDCResetSolvers(pc);CHKERRQ(ierr); 1545 /* free global vectors needed in presolve */ 1546 ierr = VecDestroy(&pcbddc->temp_solution);CHKERRQ(ierr); 1547 ierr = VecDestroy(&pcbddc->original_rhs);CHKERRQ(ierr); 1548 /* free stuff for change of basis hooks */ 1549 if (pcbddc->new_global_mat) { 1550 PCBDDCChange_ctx change_ctx; 1551 ierr = MatShellGetContext(pcbddc->new_global_mat,&change_ctx);CHKERRQ(ierr); 1552 ierr = MatDestroy(&change_ctx->original_mat);CHKERRQ(ierr); 1553 ierr = MatDestroy(&change_ctx->global_change);CHKERRQ(ierr); 1554 ierr = VecDestroyVecs(2,&change_ctx->work);CHKERRQ(ierr); 1555 ierr = PetscFree(change_ctx);CHKERRQ(ierr); 1556 } 1557 ierr = MatDestroy(&pcbddc->new_global_mat);CHKERRQ(ierr); 1558 /* remove functions */ 1559 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetChangeOfBasisMat_C",NULL);CHKERRQ(ierr); 1560 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetPrimalVerticesLocalIS_C",NULL);CHKERRQ(ierr); 1561 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetCoarseningRatio_C",NULL);CHKERRQ(ierr); 1562 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLevel_C",NULL);CHKERRQ(ierr); 1563 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetUseExactDirichlet_C",NULL);CHKERRQ(ierr); 1564 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLevels_C",NULL);CHKERRQ(ierr); 1565 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetNullSpace_C",NULL);CHKERRQ(ierr); 1566 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDirichletBoundaries_C",NULL);CHKERRQ(ierr); 1567 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDirichletBoundariesLocal_C",NULL);CHKERRQ(ierr); 1568 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetNeumannBoundaries_C",NULL);CHKERRQ(ierr); 1569 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetNeumannBoundariesLocal_C",NULL);CHKERRQ(ierr); 1570 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetDirichletBoundaries_C",NULL);CHKERRQ(ierr); 1571 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetDirichletBoundariesLocal_C",NULL);CHKERRQ(ierr); 1572 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetNeumannBoundaries_C",NULL);CHKERRQ(ierr); 1573 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetNeumannBoundariesLocal_C",NULL);CHKERRQ(ierr); 1574 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDofsSplitting_C",NULL);CHKERRQ(ierr); 1575 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDofsSplittingLocal_C",NULL);CHKERRQ(ierr); 1576 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLocalAdjacencyGraph_C",NULL);CHKERRQ(ierr); 1577 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCCreateFETIDPOperators_C",NULL);CHKERRQ(ierr); 1578 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCMatFETIDPGetRHS_C",NULL);CHKERRQ(ierr); 1579 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCMatFETIDPGetSolution_C",NULL);CHKERRQ(ierr); 1580 /* Free the private data structure */ 1581 ierr = PetscFree(pc->data);CHKERRQ(ierr); 1582 PetscFunctionReturn(0); 1583 } 1584 /* -------------------------------------------------------------------------- */ 1585 1586 #undef __FUNCT__ 1587 #define __FUNCT__ "PCBDDCMatFETIDPGetRHS_BDDC" 1588 static PetscErrorCode PCBDDCMatFETIDPGetRHS_BDDC(Mat fetidp_mat, Vec standard_rhs, Vec fetidp_flux_rhs) 1589 { 1590 FETIDPMat_ctx mat_ctx; 1591 Vec copy_standard_rhs; 1592 PC_IS* pcis; 1593 PC_BDDC* pcbddc; 1594 PetscErrorCode ierr; 1595 1596 PetscFunctionBegin; 1597 ierr = MatShellGetContext(fetidp_mat,&mat_ctx);CHKERRQ(ierr); 1598 pcis = (PC_IS*)mat_ctx->pc->data; 1599 pcbddc = (PC_BDDC*)mat_ctx->pc->data; 1600 1601 /* 1602 change of basis for physical rhs if needed 1603 It also changes the rhs in case of dirichlet boundaries 1604 TODO: better management when FETIDP will have its own class 1605 */ 1606 ierr = VecDuplicate(standard_rhs,©_standard_rhs);CHKERRQ(ierr); 1607 ierr = VecCopy(standard_rhs,copy_standard_rhs);CHKERRQ(ierr); 1608 ierr = PCPreSolve_BDDC(mat_ctx->pc,NULL,copy_standard_rhs,NULL);CHKERRQ(ierr); 1609 /* store vectors for computation of fetidp final solution */ 1610 ierr = VecScatterBegin(pcis->global_to_D,copy_standard_rhs,mat_ctx->temp_solution_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1611 ierr = VecScatterEnd(pcis->global_to_D,copy_standard_rhs,mat_ctx->temp_solution_D,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1612 /* scale rhs since it should be unassembled */ 1613 /* TODO use counter scaling? (also below) */ 1614 ierr = VecScatterBegin(pcis->global_to_B,copy_standard_rhs,mat_ctx->temp_solution_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1615 ierr = VecScatterEnd(pcis->global_to_B,copy_standard_rhs,mat_ctx->temp_solution_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1616 /* Apply partition of unity */ 1617 ierr = VecPointwiseMult(mat_ctx->temp_solution_B,pcis->D,mat_ctx->temp_solution_B);CHKERRQ(ierr); 1618 /* ierr = PCBDDCScalingRestriction(mat_ctx->pc,copy_standard_rhs,mat_ctx->temp_solution_B);CHKERRQ(ierr); */ 1619 if (!pcbddc->switch_static) { 1620 /* compute partially subassembled Schur complement right-hand side */ 1621 ierr = KSPSolve(pcbddc->ksp_D,mat_ctx->temp_solution_D,pcis->vec1_D);CHKERRQ(ierr); 1622 ierr = MatMult(pcis->A_BI,pcis->vec1_D,pcis->vec1_B);CHKERRQ(ierr); 1623 ierr = VecAXPY(mat_ctx->temp_solution_B,-1.0,pcis->vec1_B);CHKERRQ(ierr); 1624 ierr = VecSet(copy_standard_rhs,0.0);CHKERRQ(ierr); 1625 ierr = VecScatterBegin(pcis->global_to_B,mat_ctx->temp_solution_B,copy_standard_rhs,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1626 ierr = VecScatterEnd(pcis->global_to_B,mat_ctx->temp_solution_B,copy_standard_rhs,ADD_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1627 /* ierr = PCBDDCScalingRestriction(mat_ctx->pc,copy_standard_rhs,mat_ctx->temp_solution_B);CHKERRQ(ierr); */ 1628 ierr = VecScatterBegin(pcis->global_to_B,copy_standard_rhs,mat_ctx->temp_solution_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1629 ierr = VecScatterEnd(pcis->global_to_B,copy_standard_rhs,mat_ctx->temp_solution_B,INSERT_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1630 ierr = VecPointwiseMult(mat_ctx->temp_solution_B,pcis->D,mat_ctx->temp_solution_B);CHKERRQ(ierr); 1631 } 1632 ierr = VecDestroy(©_standard_rhs);CHKERRQ(ierr); 1633 /* BDDC rhs */ 1634 ierr = VecCopy(mat_ctx->temp_solution_B,pcis->vec1_B);CHKERRQ(ierr); 1635 if (pcbddc->switch_static) { 1636 ierr = VecCopy(mat_ctx->temp_solution_D,pcis->vec1_D);CHKERRQ(ierr); 1637 } 1638 /* apply BDDC */ 1639 ierr = PCBDDCApplyInterfacePreconditioner(mat_ctx->pc,PETSC_FALSE);CHKERRQ(ierr); 1640 /* Application of B_delta and assembling of rhs for fetidp fluxes */ 1641 ierr = VecSet(fetidp_flux_rhs,0.0);CHKERRQ(ierr); 1642 ierr = MatMult(mat_ctx->B_delta,pcis->vec1_B,mat_ctx->lambda_local);CHKERRQ(ierr); 1643 ierr = VecScatterBegin(mat_ctx->l2g_lambda,mat_ctx->lambda_local,fetidp_flux_rhs,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1644 ierr = VecScatterEnd(mat_ctx->l2g_lambda,mat_ctx->lambda_local,fetidp_flux_rhs,ADD_VALUES,SCATTER_FORWARD);CHKERRQ(ierr); 1645 PetscFunctionReturn(0); 1646 } 1647 1648 #undef __FUNCT__ 1649 #define __FUNCT__ "PCBDDCMatFETIDPGetRHS" 1650 /*@ 1651 PCBDDCMatFETIDPGetRHS - Compute the right-hand side for FETIDP linear system 1652 1653 Collective 1654 1655 Input Parameters: 1656 + fetidp_mat - the FETIDP matrix object obtained by calling PCBDDCCreateFETIDPOperators 1657 . standard_rhs - the right-hand side for your linear system 1658 1659 Output Parameters: 1660 - fetidp_flux_rhs - the right-hand side for the FETIDP linear system 1661 1662 Level: developer 1663 1664 Notes: 1665 1666 .seealso: PCBDDC,PCBDDCCreateFETIDPOperators 1667 @*/ 1668 PetscErrorCode PCBDDCMatFETIDPGetRHS(Mat fetidp_mat, Vec standard_rhs, Vec fetidp_flux_rhs) 1669 { 1670 FETIDPMat_ctx mat_ctx; 1671 PetscErrorCode ierr; 1672 1673 PetscFunctionBegin; 1674 ierr = MatShellGetContext(fetidp_mat,&mat_ctx);CHKERRQ(ierr); 1675 ierr = PetscTryMethod(mat_ctx->pc,"PCBDDCMatFETIDPGetRHS_C",(Mat,Vec,Vec),(fetidp_mat,standard_rhs,fetidp_flux_rhs));CHKERRQ(ierr); 1676 PetscFunctionReturn(0); 1677 } 1678 /* -------------------------------------------------------------------------- */ 1679 1680 #undef __FUNCT__ 1681 #define __FUNCT__ "PCBDDCMatFETIDPGetSolution_BDDC" 1682 static PetscErrorCode PCBDDCMatFETIDPGetSolution_BDDC(Mat fetidp_mat, Vec fetidp_flux_sol, Vec standard_sol) 1683 { 1684 FETIDPMat_ctx mat_ctx; 1685 PC_IS* pcis; 1686 PC_BDDC* pcbddc; 1687 PetscErrorCode ierr; 1688 1689 PetscFunctionBegin; 1690 ierr = MatShellGetContext(fetidp_mat,&mat_ctx);CHKERRQ(ierr); 1691 pcis = (PC_IS*)mat_ctx->pc->data; 1692 pcbddc = (PC_BDDC*)mat_ctx->pc->data; 1693 1694 /* apply B_delta^T */ 1695 ierr = VecScatterBegin(mat_ctx->l2g_lambda,fetidp_flux_sol,mat_ctx->lambda_local,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1696 ierr = VecScatterEnd (mat_ctx->l2g_lambda,fetidp_flux_sol,mat_ctx->lambda_local,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1697 ierr = MatMultTranspose(mat_ctx->B_delta,mat_ctx->lambda_local,pcis->vec1_B);CHKERRQ(ierr); 1698 /* compute rhs for BDDC application */ 1699 ierr = VecAYPX(pcis->vec1_B,-1.0,mat_ctx->temp_solution_B);CHKERRQ(ierr); 1700 if (pcbddc->switch_static) { 1701 ierr = VecCopy(mat_ctx->temp_solution_D,pcis->vec1_D);CHKERRQ(ierr); 1702 } 1703 /* apply BDDC */ 1704 ierr = PCBDDCApplyInterfacePreconditioner(mat_ctx->pc,PETSC_FALSE);CHKERRQ(ierr); 1705 /* put values into standard global vector */ 1706 ierr = VecScatterBegin(pcis->global_to_B,pcis->vec1_B,standard_sol,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1707 ierr = VecScatterEnd (pcis->global_to_B,pcis->vec1_B,standard_sol,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1708 if (!pcbddc->switch_static) { 1709 /* compute values into the interior if solved for the partially subassembled Schur complement */ 1710 ierr = MatMult(pcis->A_IB,pcis->vec1_B,pcis->vec1_D);CHKERRQ(ierr); 1711 ierr = VecAXPY(mat_ctx->temp_solution_D,-1.0,pcis->vec1_D);CHKERRQ(ierr); 1712 ierr = KSPSolve(pcbddc->ksp_D,mat_ctx->temp_solution_D,pcis->vec1_D);CHKERRQ(ierr); 1713 } 1714 ierr = VecScatterBegin(pcis->global_to_D,pcis->vec1_D,standard_sol,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1715 ierr = VecScatterEnd (pcis->global_to_D,pcis->vec1_D,standard_sol,INSERT_VALUES,SCATTER_REVERSE);CHKERRQ(ierr); 1716 /* final change of basis if needed 1717 Is also sums the dirichlet part removed during RHS assembling */ 1718 ierr = PCPostSolve_BDDC(mat_ctx->pc,NULL,NULL,standard_sol);CHKERRQ(ierr); 1719 PetscFunctionReturn(0); 1720 } 1721 1722 #undef __FUNCT__ 1723 #define __FUNCT__ "PCBDDCMatFETIDPGetSolution" 1724 /*@ 1725 PCBDDCMatFETIDPGetSolution - Compute the physical solution from the solution of the FETIDP linear system 1726 1727 Collective 1728 1729 Input Parameters: 1730 + fetidp_mat - the FETIDP matrix obtained by calling PCBDDCCreateFETIDPOperators 1731 . fetidp_flux_sol - the solution of the FETIDP linear system 1732 1733 Output Parameters: 1734 - standard_sol - the solution defined on the physical domain 1735 1736 Level: developer 1737 1738 Notes: 1739 1740 .seealso: PCBDDC,PCBDDCCreateFETIDPOperators 1741 @*/ 1742 PetscErrorCode PCBDDCMatFETIDPGetSolution(Mat fetidp_mat, Vec fetidp_flux_sol, Vec standard_sol) 1743 { 1744 FETIDPMat_ctx mat_ctx; 1745 PetscErrorCode ierr; 1746 1747 PetscFunctionBegin; 1748 ierr = MatShellGetContext(fetidp_mat,&mat_ctx);CHKERRQ(ierr); 1749 ierr = PetscTryMethod(mat_ctx->pc,"PCBDDCMatFETIDPGetSolution_C",(Mat,Vec,Vec),(fetidp_mat,fetidp_flux_sol,standard_sol));CHKERRQ(ierr); 1750 PetscFunctionReturn(0); 1751 } 1752 /* -------------------------------------------------------------------------- */ 1753 1754 extern PetscErrorCode FETIDPMatMult(Mat,Vec,Vec); 1755 extern PetscErrorCode FETIDPMatMultTranspose(Mat,Vec,Vec); 1756 extern PetscErrorCode PCBDDCDestroyFETIDPMat(Mat); 1757 extern PetscErrorCode FETIDPPCApply(PC,Vec,Vec); 1758 extern PetscErrorCode FETIDPPCApplyTranspose(PC,Vec,Vec); 1759 extern PetscErrorCode PCBDDCDestroyFETIDPPC(PC); 1760 1761 #undef __FUNCT__ 1762 #define __FUNCT__ "PCBDDCCreateFETIDPOperators_BDDC" 1763 static PetscErrorCode PCBDDCCreateFETIDPOperators_BDDC(PC pc, Mat *fetidp_mat, PC *fetidp_pc) 1764 { 1765 1766 FETIDPMat_ctx fetidpmat_ctx; 1767 Mat newmat; 1768 FETIDPPC_ctx fetidppc_ctx; 1769 PC newpc; 1770 MPI_Comm comm; 1771 PetscErrorCode ierr; 1772 1773 PetscFunctionBegin; 1774 ierr = PetscObjectGetComm((PetscObject)pc,&comm);CHKERRQ(ierr); 1775 /* FETIDP linear matrix */ 1776 ierr = PCBDDCCreateFETIDPMatContext(pc,&fetidpmat_ctx);CHKERRQ(ierr); 1777 ierr = PCBDDCSetupFETIDPMatContext(fetidpmat_ctx);CHKERRQ(ierr); 1778 ierr = MatCreateShell(comm,PETSC_DECIDE,PETSC_DECIDE,fetidpmat_ctx->n_lambda,fetidpmat_ctx->n_lambda,fetidpmat_ctx,&newmat);CHKERRQ(ierr); 1779 ierr = MatShellSetOperation(newmat,MATOP_MULT,(void (*)(void))FETIDPMatMult);CHKERRQ(ierr); 1780 ierr = MatShellSetOperation(newmat,MATOP_MULT_TRANSPOSE,(void (*)(void))FETIDPMatMultTranspose);CHKERRQ(ierr); 1781 ierr = MatShellSetOperation(newmat,MATOP_DESTROY,(void (*)(void))PCBDDCDestroyFETIDPMat);CHKERRQ(ierr); 1782 ierr = MatSetUp(newmat);CHKERRQ(ierr); 1783 /* FETIDP preconditioner */ 1784 ierr = PCBDDCCreateFETIDPPCContext(pc,&fetidppc_ctx);CHKERRQ(ierr); 1785 ierr = PCBDDCSetupFETIDPPCContext(newmat,fetidppc_ctx);CHKERRQ(ierr); 1786 ierr = PCCreate(comm,&newpc);CHKERRQ(ierr); 1787 ierr = PCSetType(newpc,PCSHELL);CHKERRQ(ierr); 1788 ierr = PCShellSetContext(newpc,fetidppc_ctx);CHKERRQ(ierr); 1789 ierr = PCShellSetApply(newpc,FETIDPPCApply);CHKERRQ(ierr); 1790 ierr = PCShellSetApplyTranspose(newpc,FETIDPPCApplyTranspose);CHKERRQ(ierr); 1791 ierr = PCShellSetDestroy(newpc,PCBDDCDestroyFETIDPPC);CHKERRQ(ierr); 1792 ierr = PCSetOperators(newpc,newmat,newmat);CHKERRQ(ierr); 1793 ierr = PCSetUp(newpc);CHKERRQ(ierr); 1794 /* return pointers for objects created */ 1795 *fetidp_mat=newmat; 1796 *fetidp_pc=newpc; 1797 PetscFunctionReturn(0); 1798 } 1799 1800 #undef __FUNCT__ 1801 #define __FUNCT__ "PCBDDCCreateFETIDPOperators" 1802 /*@ 1803 PCBDDCCreateFETIDPOperators - Create operators for FETIDP 1804 1805 Collective 1806 1807 Input Parameters: 1808 + pc - the BDDC preconditioning context already setup 1809 1810 Output Parameters: 1811 . fetidp_mat - shell FETIDP matrix object 1812 . fetidp_pc - shell Dirichlet preconditioner for FETIDP matrix 1813 1814 Options Database Keys: 1815 - -fetidp_fullyredundant: use or not a fully redundant set of Lagrange multipliers 1816 1817 Level: developer 1818 1819 Notes: 1820 Currently the only operation provided for FETIDP matrix is MatMult 1821 1822 .seealso: PCBDDC 1823 @*/ 1824 PetscErrorCode PCBDDCCreateFETIDPOperators(PC pc, Mat *fetidp_mat, PC *fetidp_pc) 1825 { 1826 PetscErrorCode ierr; 1827 1828 PetscFunctionBegin; 1829 PetscValidHeaderSpecific(pc,PC_CLASSID,1); 1830 if (pc->setupcalled) { 1831 ierr = PetscUseMethod(pc,"PCBDDCCreateFETIDPOperators_C",(PC,Mat*,PC*),(pc,fetidp_mat,fetidp_pc));CHKERRQ(ierr); 1832 } else SETERRQ(PETSC_COMM_SELF,PETSC_ERR_SUP,"You must call PCSetup_BDDC() first \n"); 1833 PetscFunctionReturn(0); 1834 } 1835 /* -------------------------------------------------------------------------- */ 1836 /*MC 1837 PCBDDC - Balancing Domain Decomposition by Constraints. 1838 1839 An implementation of the BDDC preconditioner based on 1840 1841 .vb 1842 [1] C. R. Dohrmann. "An approximate BDDC preconditioner", Numerical Linear Algebra with Applications Volume 14, Issue 2, pages 149-168, March 2007 1843 [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 1844 [3] J. Mandel, B. Sousedik, C. R. Dohrmann. "Multispace and Multilevel BDDC", http://arxiv.org/abs/0712.3977 1845 .ve 1846 1847 The matrix to be preconditioned (Pmat) must be of type MATIS. 1848 1849 Currently works with MATIS matrices with local Neumann matrices of type MATSEQAIJ, MATSEQBAIJ or MATSEQSBAIJ, either with real or complex numbers. 1850 1851 It also works with unsymmetric and indefinite problems. 1852 1853 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. 1854 1855 Approximate local solvers are automatically adapted for singular linear problems (see [1]) if the user has provided the nullspace using PCBDDCSetNullSpace 1856 1857 Boundary nodes are split in vertices, edges and faces 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() 1858 1859 Constraints can be customized by attaching a MatNullSpace object to the MATIS matrix via MatSetNearNullSpace(). 1860 1861 Change of basis is performed similarly to [2] when requested. When more the 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. 1862 1863 The PETSc implementation also supports multilevel BDDC [3]. Coarse grids are partitioned using MatPartitioning object. 1864 1865 Options Database Keys: 1866 1867 . -pc_bddc_use_vertices <1> - use or not vertices in primal space 1868 . -pc_bddc_use_edges <1> - use or not edges in primal space 1869 . -pc_bddc_use_faces <0> - use or not faces in primal space 1870 . -pc_bddc_use_change_of_basis <0> - use change of basis approach (on edges only) 1871 . -pc_bddc_use_change_on_faces <0> - use change of basis approach on faces if change of basis has been requested 1872 . -pc_bddc_switch_static <0> - switches from M_2 to M_3 operator (see reference article [1]) 1873 . -pc_bddc_levels <0> - maximum number of levels for multilevel 1874 . -pc_bddc_coarsening_ratio - H/h ratio at the coarser level 1875 - -pc_bddc_check_level <0> - set verbosity level of debugging output 1876 1877 Options for Dirichlet, Neumann or coarse solver can be set with 1878 .vb 1879 -pc_bddc_dirichlet_ 1880 -pc_bddc_neumann_ 1881 -pc_bddc_coarse_ 1882 .ve 1883 e.g -pc_bddc_dirichlet_ksp_type richardson -pc_bddc_dirichlet_pc_type gamg 1884 1885 When using a multilevel approach, solvers' options at the N-th level can be specified as 1886 .vb 1887 -pc_bddc_dirichlet_lN_ 1888 -pc_bddc_neumann_lN_ 1889 -pc_bddc_coarse_lN_ 1890 .ve 1891 Note that level number ranges from the finest 0 to the coarsest N. 1892 1893 Level: intermediate 1894 1895 Developer notes: 1896 1897 New deluxe scaling operator will be available soon. 1898 1899 Contributed by Stefano Zampini 1900 1901 .seealso: PCCreate(), PCSetType(), PCType (for list of available types), PC, MATIS 1902 M*/ 1903 1904 #undef __FUNCT__ 1905 #define __FUNCT__ "PCCreate_BDDC" 1906 PETSC_EXTERN PetscErrorCode PCCreate_BDDC(PC pc) 1907 { 1908 PetscErrorCode ierr; 1909 PC_BDDC *pcbddc; 1910 1911 PetscFunctionBegin; 1912 /* Creates the private data structure for this preconditioner and attach it to the PC object. */ 1913 ierr = PetscNewLog(pc,&pcbddc);CHKERRQ(ierr); 1914 pc->data = (void*)pcbddc; 1915 1916 /* create PCIS data structure */ 1917 ierr = PCISCreate(pc);CHKERRQ(ierr); 1918 1919 /* BDDC customization */ 1920 pcbddc->use_local_adj = PETSC_TRUE; 1921 pcbddc->use_vertices = PETSC_TRUE; 1922 pcbddc->use_edges = PETSC_TRUE; 1923 pcbddc->use_faces = PETSC_FALSE; 1924 pcbddc->use_change_of_basis = PETSC_FALSE; 1925 pcbddc->use_change_on_faces = PETSC_FALSE; 1926 pcbddc->switch_static = PETSC_FALSE; 1927 pcbddc->use_nnsp_true = PETSC_FALSE; 1928 pcbddc->use_qr_single = PETSC_FALSE; 1929 pcbddc->dbg_flag = 0; 1930 /* private */ 1931 pcbddc->issym = PETSC_FALSE; 1932 pcbddc->local_primal_size = 0; 1933 pcbddc->n_vertices = 0; 1934 pcbddc->n_actual_vertices = 0; 1935 pcbddc->n_constraints = 0; 1936 pcbddc->primal_indices_local_idxs = 0; 1937 pcbddc->recompute_topography = PETSC_FALSE; 1938 pcbddc->coarse_size = -1; 1939 pcbddc->new_primal_space = PETSC_FALSE; 1940 pcbddc->new_primal_space_local = PETSC_FALSE; 1941 pcbddc->global_primal_indices = 0; 1942 pcbddc->onearnullspace = 0; 1943 pcbddc->onearnullvecs_state = 0; 1944 pcbddc->user_primal_vertices = 0; 1945 pcbddc->NullSpace = 0; 1946 pcbddc->temp_solution = 0; 1947 pcbddc->original_rhs = 0; 1948 pcbddc->local_mat = 0; 1949 pcbddc->ChangeOfBasisMatrix = 0; 1950 pcbddc->user_ChangeOfBasisMatrix = 0; 1951 pcbddc->new_global_mat = 0; 1952 pcbddc->coarse_vec = 0; 1953 pcbddc->coarse_ksp = 0; 1954 pcbddc->coarse_phi_B = 0; 1955 pcbddc->coarse_phi_D = 0; 1956 pcbddc->coarse_psi_B = 0; 1957 pcbddc->coarse_psi_D = 0; 1958 pcbddc->vec1_P = 0; 1959 pcbddc->vec1_R = 0; 1960 pcbddc->vec2_R = 0; 1961 pcbddc->local_auxmat1 = 0; 1962 pcbddc->local_auxmat2 = 0; 1963 pcbddc->R_to_B = 0; 1964 pcbddc->R_to_D = 0; 1965 pcbddc->ksp_D = 0; 1966 pcbddc->ksp_R = 0; 1967 pcbddc->NeumannBoundaries = 0; 1968 pcbddc->NeumannBoundariesLocal = 0; 1969 pcbddc->DirichletBoundaries = 0; 1970 pcbddc->DirichletBoundariesLocal = 0; 1971 pcbddc->user_provided_isfordofs = PETSC_FALSE; 1972 pcbddc->n_ISForDofs = 0; 1973 pcbddc->n_ISForDofsLocal = 0; 1974 pcbddc->ISForDofs = 0; 1975 pcbddc->ISForDofsLocal = 0; 1976 pcbddc->ConstraintMatrix = 0; 1977 pcbddc->use_exact_dirichlet_trick = PETSC_TRUE; 1978 pcbddc->coarse_loc_to_glob = 0; 1979 pcbddc->coarsening_ratio = 8; 1980 pcbddc->current_level = 0; 1981 pcbddc->max_levels = 0; 1982 pcbddc->use_coarse_estimates = PETSC_FALSE; 1983 pcbddc->redistribute_coarse = 0; 1984 pcbddc->coarse_subassembling = 0; 1985 pcbddc->coarse_subassembling_init = 0; 1986 1987 /* create local graph structure */ 1988 ierr = PCBDDCGraphCreate(&pcbddc->mat_graph);CHKERRQ(ierr); 1989 1990 /* scaling */ 1991 pcbddc->work_scaling = 0; 1992 pcbddc->use_deluxe_scaling = PETSC_FALSE; 1993 1994 /* create sub schurs structure */ 1995 ierr = PCBDDCSubSchursCreate(&pcbddc->sub_schurs);CHKERRQ(ierr); 1996 pcbddc->sub_schurs_threshold = -1; 1997 pcbddc->sub_schurs_rebuild = PETSC_FALSE; 1998 pcbddc->sub_schurs_layers = -1; 1999 pcbddc->sub_schurs_use_useradj = PETSC_FALSE; 2000 2001 pcbddc->computed_rowadj = PETSC_FALSE; 2002 2003 /* adaptivity */ 2004 pcbddc->adaptive_threshold = -1.0; 2005 pcbddc->adaptive_invert_Stildas = PETSC_TRUE; 2006 pcbddc->adaptive_nmax = 0; 2007 pcbddc->adaptive_nmin = -1; 2008 2009 /* function pointers */ 2010 pc->ops->apply = PCApply_BDDC; 2011 pc->ops->applytranspose = PCApplyTranspose_BDDC; 2012 pc->ops->setup = PCSetUp_BDDC; 2013 pc->ops->destroy = PCDestroy_BDDC; 2014 pc->ops->setfromoptions = PCSetFromOptions_BDDC; 2015 pc->ops->view = 0; 2016 pc->ops->applyrichardson = 0; 2017 pc->ops->applysymmetricleft = 0; 2018 pc->ops->applysymmetricright = 0; 2019 pc->ops->presolve = PCPreSolve_BDDC; 2020 pc->ops->postsolve = PCPostSolve_BDDC; 2021 2022 /* composing function */ 2023 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetChangeOfBasisMat_C",PCBDDCSetChangeOfBasisMat_BDDC);CHKERRQ(ierr); 2024 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetPrimalVerticesLocalIS_C",PCBDDCSetPrimalVerticesLocalIS_BDDC);CHKERRQ(ierr); 2025 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetCoarseningRatio_C",PCBDDCSetCoarseningRatio_BDDC);CHKERRQ(ierr); 2026 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLevel_C",PCBDDCSetLevel_BDDC);CHKERRQ(ierr); 2027 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetUseExactDirichlet_C",PCBDDCSetUseExactDirichlet_BDDC);CHKERRQ(ierr); 2028 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLevels_C",PCBDDCSetLevels_BDDC);CHKERRQ(ierr); 2029 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetNullSpace_C",PCBDDCSetNullSpace_BDDC);CHKERRQ(ierr); 2030 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDirichletBoundaries_C",PCBDDCSetDirichletBoundaries_BDDC);CHKERRQ(ierr); 2031 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDirichletBoundariesLocal_C",PCBDDCSetDirichletBoundariesLocal_BDDC);CHKERRQ(ierr); 2032 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetNeumannBoundaries_C",PCBDDCSetNeumannBoundaries_BDDC);CHKERRQ(ierr); 2033 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetNeumannBoundariesLocal_C",PCBDDCSetNeumannBoundariesLocal_BDDC);CHKERRQ(ierr); 2034 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetDirichletBoundaries_C",PCBDDCGetDirichletBoundaries_BDDC);CHKERRQ(ierr); 2035 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetDirichletBoundariesLocal_C",PCBDDCGetDirichletBoundariesLocal_BDDC);CHKERRQ(ierr); 2036 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetNeumannBoundaries_C",PCBDDCGetNeumannBoundaries_BDDC);CHKERRQ(ierr); 2037 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCGetNeumannBoundariesLocal_C",PCBDDCGetNeumannBoundariesLocal_BDDC);CHKERRQ(ierr); 2038 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDofsSplitting_C",PCBDDCSetDofsSplitting_BDDC);CHKERRQ(ierr); 2039 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetDofsSplittingLocal_C",PCBDDCSetDofsSplittingLocal_BDDC);CHKERRQ(ierr); 2040 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCSetLocalAdjacencyGraph_C",PCBDDCSetLocalAdjacencyGraph_BDDC);CHKERRQ(ierr); 2041 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCCreateFETIDPOperators_C",PCBDDCCreateFETIDPOperators_BDDC);CHKERRQ(ierr); 2042 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCMatFETIDPGetRHS_C",PCBDDCMatFETIDPGetRHS_BDDC);CHKERRQ(ierr); 2043 ierr = PetscObjectComposeFunction((PetscObject)pc,"PCBDDCMatFETIDPGetSolution_C",PCBDDCMatFETIDPGetSolution_BDDC);CHKERRQ(ierr); 2044 PetscFunctionReturn(0); 2045 } 2046 2047