1 2 /* 3 This file contains routines for Parallel vector operations. 4 */ 5 #include <../src/vec/vec/impls/mpi/pvecimpl.h> /*I "petscvec.h" I*/ 6 7 #undef __FUNCT__ 8 #define __FUNCT__ "VecDot_MPI" 9 PetscErrorCode VecDot_MPI(Vec xin,Vec yin,PetscScalar *z) 10 { 11 PetscScalar sum,work; 12 PetscErrorCode ierr; 13 14 PetscFunctionBegin; 15 ierr = VecDot_Seq(xin,yin,&work);CHKERRQ(ierr); 16 ierr = MPI_Allreduce(&work,&sum,1,MPIU_SCALAR,MPIU_SUM,PetscObjectComm((PetscObject)xin));CHKERRQ(ierr); 17 *z = sum; 18 PetscFunctionReturn(0); 19 } 20 21 #undef __FUNCT__ 22 #define __FUNCT__ "VecTDot_MPI" 23 PetscErrorCode VecTDot_MPI(Vec xin,Vec yin,PetscScalar *z) 24 { 25 PetscScalar sum,work; 26 PetscErrorCode ierr; 27 28 PetscFunctionBegin; 29 ierr = VecTDot_Seq(xin,yin,&work);CHKERRQ(ierr); 30 ierr = MPI_Allreduce(&work,&sum,1,MPIU_SCALAR,MPIU_SUM,PetscObjectComm((PetscObject)xin));CHKERRQ(ierr); 31 *z = sum; 32 PetscFunctionReturn(0); 33 } 34 35 EXTERN_C_BEGIN 36 extern PetscErrorCode VecView_MPI_Draw(Vec,PetscViewer); 37 EXTERN_C_END 38 39 #undef __FUNCT__ 40 #define __FUNCT__ "VecPlaceArray_MPI" 41 PetscErrorCode VecPlaceArray_MPI(Vec vin,const PetscScalar *a) 42 { 43 PetscErrorCode ierr; 44 Vec_MPI *v = (Vec_MPI*)vin->data; 45 46 PetscFunctionBegin; 47 if (v->unplacedarray) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONGSTATE,"VecPlaceArray() was already called on this vector, without a call to VecResetArray()"); 48 v->unplacedarray = v->array; /* save previous array so reset can bring it back */ 49 v->array = (PetscScalar*)a; 50 if (v->localrep) { 51 ierr = VecPlaceArray(v->localrep,a);CHKERRQ(ierr); 52 } 53 PetscFunctionReturn(0); 54 } 55 56 extern PetscErrorCode VecGetValues_MPI(Vec,PetscInt,const PetscInt [],PetscScalar []); 57 58 #undef __FUNCT__ 59 #define __FUNCT__ "VecDuplicate_MPI" 60 static PetscErrorCode VecDuplicate_MPI(Vec win,Vec *v) 61 { 62 PetscErrorCode ierr; 63 Vec_MPI *vw,*w = (Vec_MPI*)win->data; 64 PetscScalar *array; 65 66 PetscFunctionBegin; 67 ierr = VecCreate(PetscObjectComm((PetscObject)win),v);CHKERRQ(ierr); 68 ierr = PetscLayoutReference(win->map,&(*v)->map);CHKERRQ(ierr); 69 70 ierr = VecCreate_MPI_Private(*v,PETSC_TRUE,w->nghost,0);CHKERRQ(ierr); 71 vw = (Vec_MPI*)(*v)->data; 72 ierr = PetscMemcpy((*v)->ops,win->ops,sizeof(struct _VecOps));CHKERRQ(ierr); 73 74 /* save local representation of the parallel vector (and scatter) if it exists */ 75 if (w->localrep) { 76 ierr = VecGetArray(*v,&array);CHKERRQ(ierr); 77 ierr = VecCreateSeqWithArray(PETSC_COMM_SELF,win->map->bs,win->map->n+w->nghost,array,&vw->localrep);CHKERRQ(ierr); 78 ierr = PetscMemcpy(vw->localrep->ops,w->localrep->ops,sizeof(struct _VecOps));CHKERRQ(ierr); 79 ierr = VecRestoreArray(*v,&array);CHKERRQ(ierr); 80 ierr = PetscLogObjectParent(*v,vw->localrep);CHKERRQ(ierr); 81 82 vw->localupdate = w->localupdate; 83 if (vw->localupdate) { 84 ierr = PetscObjectReference((PetscObject)vw->localupdate);CHKERRQ(ierr); 85 } 86 } 87 88 /* New vector should inherit stashing property of parent */ 89 (*v)->stash.donotstash = win->stash.donotstash; 90 (*v)->stash.ignorenegidx = win->stash.ignorenegidx; 91 92 ierr = PetscObjectListDuplicate(((PetscObject)win)->olist,&((PetscObject)(*v))->olist);CHKERRQ(ierr); 93 ierr = PetscFunctionListDuplicate(((PetscObject)win)->qlist,&((PetscObject)(*v))->qlist);CHKERRQ(ierr); 94 95 (*v)->map->bs = win->map->bs; 96 (*v)->bstash.bs = win->bstash.bs; 97 PetscFunctionReturn(0); 98 } 99 100 extern PetscErrorCode VecSetOption_MPI(Vec,VecOption,PetscBool); 101 extern PetscErrorCode VecResetArray_MPI(Vec); 102 103 static struct _VecOps DvOps = { VecDuplicate_MPI, /* 1 */ 104 VecDuplicateVecs_Default, 105 VecDestroyVecs_Default, 106 VecDot_MPI, 107 VecMDot_MPI, 108 VecNorm_MPI, 109 VecTDot_MPI, 110 VecMTDot_MPI, 111 VecScale_Seq, 112 VecCopy_Seq, /* 10 */ 113 VecSet_Seq, 114 VecSwap_Seq, 115 VecAXPY_Seq, 116 VecAXPBY_Seq, 117 VecMAXPY_Seq, 118 VecAYPX_Seq, 119 VecWAXPY_Seq, 120 VecAXPBYPCZ_Seq, 121 VecPointwiseMult_Seq, 122 VecPointwiseDivide_Seq, 123 VecSetValues_MPI, /* 20 */ 124 VecAssemblyBegin_MPI, 125 VecAssemblyEnd_MPI, 126 0, 127 VecGetSize_MPI, 128 VecGetSize_Seq, 129 0, 130 VecMax_MPI, 131 VecMin_MPI, 132 VecSetRandom_Seq, 133 VecSetOption_MPI, 134 VecSetValuesBlocked_MPI, 135 VecDestroy_MPI, 136 VecView_MPI, 137 VecPlaceArray_MPI, 138 VecReplaceArray_Seq, 139 VecDot_Seq, 140 VecTDot_Seq, 141 VecNorm_Seq, 142 VecMDot_Seq, 143 VecMTDot_Seq, 144 VecLoad_Default, 145 VecReciprocal_Default, 146 VecConjugate_Seq, 147 0, 148 0, 149 VecResetArray_MPI, 150 0, 151 VecMaxPointwiseDivide_Seq, 152 VecPointwiseMax_Seq, 153 VecPointwiseMaxAbs_Seq, 154 VecPointwiseMin_Seq, 155 VecGetValues_MPI, 156 0, 157 0, 158 0, 159 0, 160 0, 161 0, 162 VecStrideGather_Default, 163 VecStrideScatter_Default}; 164 165 #undef __FUNCT__ 166 #define __FUNCT__ "VecCreate_MPI_Private" 167 /* 168 VecCreate_MPI_Private - Basic create routine called by VecCreate_MPI() (i.e. VecCreateMPI()), 169 VecCreateMPIWithArray(), VecCreate_Shared() (i.e. VecCreateShared()), VecCreateGhost(), 170 VecDuplicate_MPI(), VecCreateGhostWithArray(), VecDuplicate_MPI(), and VecDuplicate_Shared() 171 172 If alloc is true and array is NULL then this routine allocates the space, otherwise 173 no space is allocated. 174 */ 175 PetscErrorCode VecCreate_MPI_Private(Vec v,PetscBool alloc,PetscInt nghost,const PetscScalar array[]) 176 { 177 Vec_MPI *s; 178 PetscErrorCode ierr; 179 180 PetscFunctionBegin; 181 ierr = PetscNewLog(v,Vec_MPI,&s);CHKERRQ(ierr); 182 v->data = (void*)s; 183 ierr = PetscMemcpy(v->ops,&DvOps,sizeof(DvOps));CHKERRQ(ierr); 184 s->nghost = nghost; 185 v->petscnative = PETSC_TRUE; 186 187 ierr = PetscLayoutSetUp(v->map);CHKERRQ(ierr); 188 189 s->array = (PetscScalar*)array; 190 s->array_allocated = 0; 191 if (alloc && !array) { 192 PetscInt n = v->map->n+nghost; 193 ierr = PetscMalloc(n*sizeof(PetscScalar),&s->array);CHKERRQ(ierr); 194 ierr = PetscLogObjectMemory(v,n*sizeof(PetscScalar));CHKERRQ(ierr); 195 ierr = PetscMemzero(s->array,v->map->n*sizeof(PetscScalar));CHKERRQ(ierr); 196 s->array_allocated = s->array; 197 } 198 199 /* By default parallel vectors do not have local representation */ 200 s->localrep = 0; 201 s->localupdate = 0; 202 203 v->stash.insertmode = NOT_SET_VALUES; 204 /* create the stashes. The block-size for bstash is set later when 205 VecSetValuesBlocked is called. 206 */ 207 ierr = VecStashCreate_Private(PetscObjectComm((PetscObject)v),1,&v->stash);CHKERRQ(ierr); 208 ierr = VecStashCreate_Private(PetscObjectComm((PetscObject)v),v->map->bs,&v->bstash);CHKERRQ(ierr); 209 210 #if defined(PETSC_HAVE_MATLAB_ENGINE) 211 ierr = PetscObjectComposeFunctionDynamic((PetscObject)v,"PetscMatlabEnginePut_C","VecMatlabEnginePut_Default",VecMatlabEnginePut_Default);CHKERRQ(ierr); 212 ierr = PetscObjectComposeFunctionDynamic((PetscObject)v,"PetscMatlabEngineGet_C","VecMatlabEngineGet_Default",VecMatlabEngineGet_Default);CHKERRQ(ierr); 213 #endif 214 ierr = PetscObjectChangeTypeName((PetscObject)v,VECMPI);CHKERRQ(ierr); 215 PetscFunctionReturn(0); 216 } 217 218 /*MC 219 VECMPI - VECMPI = "mpi" - The basic parallel vector 220 221 Options Database Keys: 222 . -vec_type mpi - sets the vector type to VECMPI during a call to VecSetFromOptions() 223 224 Level: beginner 225 226 .seealso: VecCreate(), VecSetType(), VecSetFromOptions(), VecCreateMpiWithArray(), VECMPI, VecType, VecCreateMPI(), VecCreateMpi() 227 M*/ 228 229 EXTERN_C_BEGIN 230 #undef __FUNCT__ 231 #define __FUNCT__ "VecCreate_MPI" 232 PetscErrorCode VecCreate_MPI(Vec vv) 233 { 234 PetscErrorCode ierr; 235 236 PetscFunctionBegin; 237 ierr = VecCreate_MPI_Private(vv,PETSC_TRUE,0,0);CHKERRQ(ierr); 238 PetscFunctionReturn(0); 239 } 240 EXTERN_C_END 241 242 /*MC 243 VECSTANDARD = "standard" - A VECSEQ on one process and VECMPI on more than one process 244 245 Options Database Keys: 246 . -vec_type standard - sets a vector type to standard on calls to VecSetFromOptions() 247 248 Level: beginner 249 250 .seealso: VecCreateSeq(), VecCreateMPI() 251 M*/ 252 253 EXTERN_C_BEGIN 254 #undef __FUNCT__ 255 #define __FUNCT__ "VecCreate_Standard" 256 PetscErrorCode VecCreate_Standard(Vec v) 257 { 258 PetscErrorCode ierr; 259 PetscMPIInt size; 260 261 PetscFunctionBegin; 262 ierr = MPI_Comm_size(PetscObjectComm((PetscObject)v),&size);CHKERRQ(ierr); 263 if (size == 1) { 264 ierr = VecSetType(v,VECSEQ);CHKERRQ(ierr); 265 } else { 266 ierr = VecSetType(v,VECMPI);CHKERRQ(ierr); 267 } 268 PetscFunctionReturn(0); 269 } 270 EXTERN_C_END 271 272 273 #undef __FUNCT__ 274 #define __FUNCT__ "VecCreateMPIWithArray" 275 /*@C 276 VecCreateMPIWithArray - Creates a parallel, array-style vector, 277 where the user provides the array space to store the vector values. 278 279 Collective on MPI_Comm 280 281 Input Parameters: 282 + comm - the MPI communicator to use 283 . bs - block size, same meaning as VecSetBlockSize() 284 . n - local vector length, cannot be PETSC_DECIDE 285 . N - global vector length (or PETSC_DECIDE to have calculated) 286 - array - the user provided array to store the vector values 287 288 Output Parameter: 289 . vv - the vector 290 291 Notes: 292 Use VecDuplicate() or VecDuplicateVecs() to form additional vectors of the 293 same type as an existing vector. 294 295 If the user-provided array is NULL, then VecPlaceArray() can be used 296 at a later stage to SET the array for storing the vector values. 297 298 PETSc does NOT free the array when the vector is destroyed via VecDestroy(). 299 The user should not free the array until the vector is destroyed. 300 301 Level: intermediate 302 303 Concepts: vectors^creating with array 304 305 .seealso: VecCreateSeqWithArray(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateGhost(), 306 VecCreateMPI(), VecCreateGhostWithArray(), VecPlaceArray() 307 308 @*/ 309 PetscErrorCode VecCreateMPIWithArray(MPI_Comm comm,PetscInt bs,PetscInt n,PetscInt N,const PetscScalar array[],Vec *vv) 310 { 311 PetscErrorCode ierr; 312 313 PetscFunctionBegin; 314 if (n == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local size of vector"); 315 ierr = PetscSplitOwnership(comm,&n,&N);CHKERRQ(ierr); 316 ierr = VecCreate(comm,vv);CHKERRQ(ierr); 317 ierr = VecSetSizes(*vv,n,N);CHKERRQ(ierr); 318 ierr = VecSetBlockSize(*vv,bs);CHKERRQ(ierr); 319 ierr = VecCreate_MPI_Private(*vv,PETSC_FALSE,0,array);CHKERRQ(ierr); 320 PetscFunctionReturn(0); 321 } 322 323 #undef __FUNCT__ 324 #define __FUNCT__ "VecCreateGhostWithArray" 325 /*@C 326 VecCreateGhostWithArray - Creates a parallel vector with ghost padding on each processor; 327 the caller allocates the array space. 328 329 Collective on MPI_Comm 330 331 Input Parameters: 332 + comm - the MPI communicator to use 333 . n - local vector length 334 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 335 . nghost - number of local ghost points 336 . ghosts - global indices of ghost points (or NULL if not needed), these do not need to be in increasing order (sorted) 337 - array - the space to store the vector values (as long as n + nghost) 338 339 Output Parameter: 340 . vv - the global vector representation (without ghost points as part of vector) 341 342 Notes: 343 Use VecGhostGetLocalForm() to access the local, ghosted representation 344 of the vector. 345 346 This also automatically sets the ISLocalToGlobalMapping() for this vector. 347 348 Level: advanced 349 350 Concepts: vectors^creating with array 351 Concepts: vectors^ghosted 352 353 .seealso: VecCreate(), VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), 354 VecCreateGhost(), VecCreateSeqWithArray(), VecCreateMPIWithArray(), 355 VecCreateGhostBlock(), VecCreateGhostBlockWithArray(), VecMPISetGhost() 356 357 @*/ 358 PetscErrorCode VecCreateGhostWithArray(MPI_Comm comm,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],const PetscScalar array[],Vec *vv) 359 { 360 PetscErrorCode ierr; 361 Vec_MPI *w; 362 PetscScalar *larray; 363 IS from,to; 364 ISLocalToGlobalMapping ltog; 365 PetscInt rstart,i,*indices; 366 367 PetscFunctionBegin; 368 *vv = 0; 369 370 if (n == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local size"); 371 if (nghost == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local ghost size"); 372 if (nghost < 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Ghost length must be >= 0"); 373 ierr = PetscSplitOwnership(comm,&n,&N);CHKERRQ(ierr); 374 /* Create global representation */ 375 ierr = VecCreate(comm,vv);CHKERRQ(ierr); 376 ierr = VecSetSizes(*vv,n,N);CHKERRQ(ierr); 377 ierr = VecCreate_MPI_Private(*vv,PETSC_TRUE,nghost,array);CHKERRQ(ierr); 378 w = (Vec_MPI*)(*vv)->data; 379 /* Create local representation */ 380 ierr = VecGetArray(*vv,&larray);CHKERRQ(ierr); 381 ierr = VecCreateSeqWithArray(PETSC_COMM_SELF,1,n+nghost,larray,&w->localrep);CHKERRQ(ierr); 382 ierr = PetscLogObjectParent(*vv,w->localrep);CHKERRQ(ierr); 383 ierr = VecRestoreArray(*vv,&larray);CHKERRQ(ierr); 384 385 /* 386 Create scatter context for scattering (updating) ghost values 387 */ 388 ierr = ISCreateGeneral(comm,nghost,ghosts,PETSC_COPY_VALUES,&from);CHKERRQ(ierr); 389 ierr = ISCreateStride(PETSC_COMM_SELF,nghost,n,1,&to);CHKERRQ(ierr); 390 ierr = VecScatterCreate(*vv,from,w->localrep,to,&w->localupdate);CHKERRQ(ierr); 391 ierr = PetscLogObjectParent(*vv,w->localupdate);CHKERRQ(ierr); 392 ierr = ISDestroy(&to);CHKERRQ(ierr); 393 ierr = ISDestroy(&from);CHKERRQ(ierr); 394 395 /* set local to global mapping for ghosted vector */ 396 ierr = PetscMalloc((n+nghost)*sizeof(PetscInt),&indices);CHKERRQ(ierr); 397 ierr = VecGetOwnershipRange(*vv,&rstart,NULL);CHKERRQ(ierr); 398 for (i=0; i<n; i++) { 399 indices[i] = rstart + i; 400 } 401 for (i=0; i<nghost; i++) { 402 indices[n+i] = ghosts[i]; 403 } 404 ierr = ISLocalToGlobalMappingCreate(comm,n+nghost,indices,PETSC_OWN_POINTER,<og);CHKERRQ(ierr); 405 ierr = VecSetLocalToGlobalMapping(*vv,ltog);CHKERRQ(ierr); 406 ierr = ISLocalToGlobalMappingDestroy(<og);CHKERRQ(ierr); 407 PetscFunctionReturn(0); 408 } 409 410 #undef __FUNCT__ 411 #define __FUNCT__ "VecCreateGhost" 412 /*@ 413 VecCreateGhost - Creates a parallel vector with ghost padding on each processor. 414 415 Collective on MPI_Comm 416 417 Input Parameters: 418 + comm - the MPI communicator to use 419 . n - local vector length 420 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 421 . nghost - number of local ghost points 422 - ghosts - global indices of ghost points, these do not need to be in increasing order (sorted) 423 424 Output Parameter: 425 . vv - the global vector representation (without ghost points as part of vector) 426 427 Notes: 428 Use VecGhostGetLocalForm() to access the local, ghosted representation 429 of the vector. 430 431 This also automatically sets the ISLocalToGlobalMapping() for this vector. 432 433 Level: advanced 434 435 Concepts: vectors^ghosted 436 437 .seealso: VecCreateSeq(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateMPI(), 438 VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), VecGhostUpdateBegin(), 439 VecCreateGhostWithArray(), VecCreateMPIWithArray(), VecGhostUpdateEnd(), 440 VecCreateGhostBlock(), VecCreateGhostBlockWithArray(), VecMPISetGhost() 441 442 @*/ 443 PetscErrorCode VecCreateGhost(MPI_Comm comm,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],Vec *vv) 444 { 445 PetscErrorCode ierr; 446 447 PetscFunctionBegin; 448 ierr = VecCreateGhostWithArray(comm,n,N,nghost,ghosts,0,vv);CHKERRQ(ierr); 449 PetscFunctionReturn(0); 450 } 451 452 #undef __FUNCT__ 453 #define __FUNCT__ "VecMPISetGhost" 454 /*@ 455 VecMPISetGhost - Sets the ghost points for an MPI ghost vector 456 457 Collective on Vec 458 459 Input Parameters: 460 + vv - the MPI vector 461 . nghost - number of local ghost points 462 - ghosts - global indices of ghost points, these do not need to be in increasing order (sorted) 463 464 465 Notes: 466 Use VecGhostGetLocalForm() to access the local, ghosted representation 467 of the vector. 468 469 This also automatically sets the ISLocalToGlobalMapping() for this vector. 470 471 You must call this AFTER you have set the type of the vector (with VecSetType()) and the size (with VecSetSizes()). 472 473 Level: advanced 474 475 Concepts: vectors^ghosted 476 477 .seealso: VecCreateSeq(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateMPI(), 478 VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), VecGhostUpdateBegin(), 479 VecCreateGhostWithArray(), VecCreateMPIWithArray(), VecGhostUpdateEnd(), 480 VecCreateGhostBlock(), VecCreateGhostBlockWithArray() 481 482 @*/ 483 PetscErrorCode VecMPISetGhost(Vec vv,PetscInt nghost,const PetscInt ghosts[]) 484 { 485 PetscErrorCode ierr; 486 PetscBool flg; 487 488 PetscFunctionBegin; 489 ierr = PetscObjectTypeCompare((PetscObject)vv,VECMPI,&flg);CHKERRQ(ierr); 490 /* if already fully existant VECMPI then basically destroy it and rebuild with ghosting */ 491 if (flg) { 492 PetscInt n,N; 493 Vec_MPI *w; 494 PetscScalar *larray; 495 IS from,to; 496 ISLocalToGlobalMapping ltog; 497 PetscInt rstart,i,*indices; 498 MPI_Comm comm; 499 500 ierr = PetscObjectGetComm((PetscObject)vv,&comm);CHKERRQ(ierr); 501 n = vv->map->n; 502 N = vv->map->N; 503 ierr = (*vv->ops->destroy)(vv);CHKERRQ(ierr); 504 ierr = VecSetSizes(vv,n,N);CHKERRQ(ierr); 505 ierr = VecCreate_MPI_Private(vv,PETSC_TRUE,nghost,NULL);CHKERRQ(ierr); 506 w = (Vec_MPI*)(vv)->data; 507 /* Create local representation */ 508 ierr = VecGetArray(vv,&larray);CHKERRQ(ierr); 509 ierr = VecCreateSeqWithArray(PETSC_COMM_SELF,1,n+nghost,larray,&w->localrep);CHKERRQ(ierr); 510 ierr = PetscLogObjectParent(vv,w->localrep);CHKERRQ(ierr); 511 ierr = VecRestoreArray(vv,&larray);CHKERRQ(ierr); 512 513 /* 514 Create scatter context for scattering (updating) ghost values 515 */ 516 ierr = ISCreateGeneral(comm,nghost,ghosts,PETSC_COPY_VALUES,&from);CHKERRQ(ierr); 517 ierr = ISCreateStride(PETSC_COMM_SELF,nghost,n,1,&to);CHKERRQ(ierr); 518 ierr = VecScatterCreate(vv,from,w->localrep,to,&w->localupdate);CHKERRQ(ierr); 519 ierr = PetscLogObjectParent(vv,w->localupdate);CHKERRQ(ierr); 520 ierr = ISDestroy(&to);CHKERRQ(ierr); 521 ierr = ISDestroy(&from);CHKERRQ(ierr); 522 523 /* set local to global mapping for ghosted vector */ 524 ierr = PetscMalloc((n+nghost)*sizeof(PetscInt),&indices);CHKERRQ(ierr); 525 ierr = VecGetOwnershipRange(vv,&rstart,NULL);CHKERRQ(ierr); 526 527 for (i=0; i<n; i++) indices[i] = rstart + i; 528 for (i=0; i<nghost; i++) indices[n+i] = ghosts[i]; 529 530 ierr = ISLocalToGlobalMappingCreate(comm,n+nghost,indices,PETSC_OWN_POINTER,<og);CHKERRQ(ierr); 531 ierr = VecSetLocalToGlobalMapping(vv,ltog);CHKERRQ(ierr); 532 ierr = ISLocalToGlobalMappingDestroy(<og);CHKERRQ(ierr); 533 } else if (vv->ops->create == VecCreate_MPI) SETERRQ(PetscObjectComm((PetscObject)vv),PETSC_ERR_ARG_WRONGSTATE,"Must set local or global size before setting ghosting"); 534 else if (!((PetscObject)vv)->type_name) SETERRQ(PetscObjectComm((PetscObject)vv),PETSC_ERR_ARG_WRONGSTATE,"Must set type to VECMPI before ghosting"); 535 PetscFunctionReturn(0); 536 } 537 538 539 /* ------------------------------------------------------------------------------------------*/ 540 #undef __FUNCT__ 541 #define __FUNCT__ "VecCreateGhostBlockWithArray" 542 /*@C 543 VecCreateGhostBlockWithArray - Creates a parallel vector with ghost padding on each processor; 544 the caller allocates the array space. Indices in the ghost region are based on blocks. 545 546 Collective on MPI_Comm 547 548 Input Parameters: 549 + comm - the MPI communicator to use 550 . bs - block size 551 . n - local vector length 552 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 553 . nghost - number of local ghost blocks 554 . ghosts - global indices of ghost blocks (or NULL if not needed), counts are by block not by index, these do not need to be in increasing order (sorted) 555 - array - the space to store the vector values (as long as n + nghost*bs) 556 557 Output Parameter: 558 . vv - the global vector representation (without ghost points as part of vector) 559 560 Notes: 561 Use VecGhostGetLocalForm() to access the local, ghosted representation 562 of the vector. 563 564 n is the local vector size (total local size not the number of blocks) while nghost 565 is the number of blocks in the ghost portion, i.e. the number of elements in the ghost 566 portion is bs*nghost 567 568 Level: advanced 569 570 Concepts: vectors^creating ghosted 571 Concepts: vectors^creating with array 572 573 .seealso: VecCreate(), VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), 574 VecCreateGhost(), VecCreateSeqWithArray(), VecCreateMPIWithArray(), 575 VecCreateGhostWithArray(), VecCreateGhostBlock() 576 577 @*/ 578 PetscErrorCode VecCreateGhostBlockWithArray(MPI_Comm comm,PetscInt bs,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],const PetscScalar array[],Vec *vv) 579 { 580 PetscErrorCode ierr; 581 Vec_MPI *w; 582 PetscScalar *larray; 583 IS from,to; 584 ISLocalToGlobalMapping ltog; 585 PetscInt rstart,i,nb,*indices; 586 587 PetscFunctionBegin; 588 *vv = 0; 589 590 if (n == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local size"); 591 if (nghost == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local ghost size"); 592 if (nghost < 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Ghost length must be >= 0"); 593 if (n % bs) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_INCOMP,"Local size must be a multiple of block size"); 594 ierr = PetscSplitOwnership(comm,&n,&N);CHKERRQ(ierr); 595 /* Create global representation */ 596 ierr = VecCreate(comm,vv);CHKERRQ(ierr); 597 ierr = VecSetSizes(*vv,n,N);CHKERRQ(ierr); 598 ierr = VecSetBlockSize(*vv,bs);CHKERRQ(ierr); 599 ierr = VecCreate_MPI_Private(*vv,PETSC_TRUE,nghost*bs,array);CHKERRQ(ierr); 600 w = (Vec_MPI*)(*vv)->data; 601 /* Create local representation */ 602 ierr = VecGetArray(*vv,&larray);CHKERRQ(ierr); 603 ierr = VecCreateSeqWithArray(PETSC_COMM_SELF,bs,n+bs*nghost,larray,&w->localrep);CHKERRQ(ierr); 604 ierr = PetscLogObjectParent(*vv,w->localrep);CHKERRQ(ierr); 605 ierr = VecRestoreArray(*vv,&larray);CHKERRQ(ierr); 606 607 /* 608 Create scatter context for scattering (updating) ghost values 609 */ 610 ierr = ISCreateBlock(comm,bs,nghost,ghosts,PETSC_COPY_VALUES,&from);CHKERRQ(ierr); 611 ierr = ISCreateStride(PETSC_COMM_SELF,bs*nghost,n,1,&to);CHKERRQ(ierr); 612 ierr = VecScatterCreate(*vv,from,w->localrep,to,&w->localupdate);CHKERRQ(ierr); 613 ierr = PetscLogObjectParent(*vv,w->localupdate);CHKERRQ(ierr); 614 ierr = ISDestroy(&to);CHKERRQ(ierr); 615 ierr = ISDestroy(&from);CHKERRQ(ierr); 616 617 /* set local to global mapping for ghosted vector */ 618 nb = n/bs; 619 ierr = PetscMalloc((nb+nghost)*sizeof(PetscInt),&indices);CHKERRQ(ierr); 620 ierr = VecGetOwnershipRange(*vv,&rstart,NULL);CHKERRQ(ierr); 621 622 for (i=0; i<nb; i++) indices[i] = rstart + i*bs; 623 for (i=0; i<nghost; i++) indices[nb+i] = ghosts[i]; 624 625 ierr = ISLocalToGlobalMappingCreate(comm,nb+nghost,indices,PETSC_OWN_POINTER,<og);CHKERRQ(ierr); 626 ierr = VecSetLocalToGlobalMappingBlock(*vv,ltog);CHKERRQ(ierr); 627 ierr = ISLocalToGlobalMappingDestroy(<og);CHKERRQ(ierr); 628 PetscFunctionReturn(0); 629 } 630 631 #undef __FUNCT__ 632 #define __FUNCT__ "VecCreateGhostBlock" 633 /*@ 634 VecCreateGhostBlock - Creates a parallel vector with ghost padding on each processor. 635 The indicing of the ghost points is done with blocks. 636 637 Collective on MPI_Comm 638 639 Input Parameters: 640 + comm - the MPI communicator to use 641 . bs - the block size 642 . n - local vector length 643 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 644 . nghost - number of local ghost blocks 645 - ghosts - global indices of ghost blocks, counts are by block, not by individual index, these do not need to be in increasing order (sorted) 646 647 Output Parameter: 648 . vv - the global vector representation (without ghost points as part of vector) 649 650 Notes: 651 Use VecGhostGetLocalForm() to access the local, ghosted representation 652 of the vector. 653 654 n is the local vector size (total local size not the number of blocks) while nghost 655 is the number of blocks in the ghost portion, i.e. the number of elements in the ghost 656 portion is bs*nghost 657 658 Level: advanced 659 660 Concepts: vectors^ghosted 661 662 .seealso: VecCreateSeq(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateMPI(), 663 VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), 664 VecCreateGhostWithArray(), VecCreateMPIWithArray(), VecCreateGhostBlockWithArray() 665 666 @*/ 667 PetscErrorCode VecCreateGhostBlock(MPI_Comm comm,PetscInt bs,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],Vec *vv) 668 { 669 PetscErrorCode ierr; 670 671 PetscFunctionBegin; 672 ierr = VecCreateGhostBlockWithArray(comm,bs,n,N,nghost,ghosts,0,vv);CHKERRQ(ierr); 673 PetscFunctionReturn(0); 674 } 675