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