1 2 /* 3 This file contains routines for Parallel vector operations. 4 */ 5 #include <petscsys.h> 6 #include <../src/vec/vec/impls/mpi/pvecimpl.h> /*I "petscvec.h" I*/ 7 8 PetscErrorCode VecDot_MPI(Vec xin,Vec yin,PetscScalar *z) 9 { 10 PetscScalar sum,work; 11 PetscErrorCode ierr; 12 13 PetscFunctionBegin; 14 ierr = VecDot_Seq(xin,yin,&work);CHKERRQ(ierr); 15 ierr = MPIU_Allreduce(&work,&sum,1,MPIU_SCALAR,MPIU_SUM,PetscObjectComm((PetscObject)xin));CHKERRQ(ierr); 16 *z = sum; 17 PetscFunctionReturn(0); 18 } 19 20 PetscErrorCode VecTDot_MPI(Vec xin,Vec yin,PetscScalar *z) 21 { 22 PetscScalar sum,work; 23 PetscErrorCode ierr; 24 25 PetscFunctionBegin; 26 ierr = VecTDot_Seq(xin,yin,&work);CHKERRQ(ierr); 27 ierr = MPIU_Allreduce(&work,&sum,1,MPIU_SCALAR,MPIU_SUM,PetscObjectComm((PetscObject)xin));CHKERRQ(ierr); 28 *z = sum; 29 PetscFunctionReturn(0); 30 } 31 32 extern PetscErrorCode VecView_MPI_Draw(Vec,PetscViewer); 33 34 static PetscErrorCode VecPlaceArray_MPI(Vec vin,const PetscScalar *a) 35 { 36 PetscErrorCode ierr; 37 Vec_MPI *v = (Vec_MPI*)vin->data; 38 39 PetscFunctionBegin; 40 if (v->unplacedarray) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_WRONGSTATE,"VecPlaceArray() was already called on this vector, without a call to VecResetArray()"); 41 v->unplacedarray = v->array; /* save previous array so reset can bring it back */ 42 v->array = (PetscScalar*)a; 43 if (v->localrep) { 44 ierr = VecPlaceArray(v->localrep,a);CHKERRQ(ierr); 45 } 46 PetscFunctionReturn(0); 47 } 48 49 static PetscErrorCode VecDuplicate_MPI(Vec win,Vec *v) 50 { 51 PetscErrorCode ierr; 52 Vec_MPI *vw,*w = (Vec_MPI*)win->data; 53 PetscScalar *array; 54 55 PetscFunctionBegin; 56 ierr = VecCreate(PetscObjectComm((PetscObject)win),v);CHKERRQ(ierr); 57 ierr = PetscLayoutReference(win->map,&(*v)->map);CHKERRQ(ierr); 58 59 ierr = VecCreate_MPI_Private(*v,PETSC_TRUE,w->nghost,0);CHKERRQ(ierr); 60 vw = (Vec_MPI*)(*v)->data; 61 ierr = PetscMemcpy((*v)->ops,win->ops,sizeof(struct _VecOps));CHKERRQ(ierr); 62 63 /* save local representation of the parallel vector (and scatter) if it exists */ 64 if (w->localrep) { 65 ierr = VecGetArray(*v,&array);CHKERRQ(ierr); 66 ierr = VecCreateSeqWithArray(PETSC_COMM_SELF,PetscAbs(win->map->bs),win->map->n+w->nghost,array,&vw->localrep);CHKERRQ(ierr); 67 ierr = PetscMemcpy(vw->localrep->ops,w->localrep->ops,sizeof(struct _VecOps));CHKERRQ(ierr); 68 ierr = VecRestoreArray(*v,&array);CHKERRQ(ierr); 69 ierr = PetscLogObjectParent((PetscObject)*v,(PetscObject)vw->localrep);CHKERRQ(ierr); 70 71 vw->localupdate = w->localupdate; 72 if (vw->localupdate) { 73 ierr = PetscObjectReference((PetscObject)vw->localupdate);CHKERRQ(ierr); 74 } 75 } 76 77 /* New vector should inherit stashing property of parent */ 78 (*v)->stash.donotstash = win->stash.donotstash; 79 (*v)->stash.ignorenegidx = win->stash.ignorenegidx; 80 81 ierr = PetscObjectListDuplicate(((PetscObject)win)->olist,&((PetscObject)(*v))->olist);CHKERRQ(ierr); 82 ierr = PetscFunctionListDuplicate(((PetscObject)win)->qlist,&((PetscObject)(*v))->qlist);CHKERRQ(ierr); 83 84 (*v)->map->bs = PetscAbs(win->map->bs); 85 (*v)->bstash.bs = win->bstash.bs; 86 PetscFunctionReturn(0); 87 } 88 89 90 static PetscErrorCode VecSetOption_MPI(Vec V,VecOption op,PetscBool flag) 91 { 92 Vec_MPI *v = (Vec_MPI*)V->data; 93 PetscErrorCode ierr; 94 95 PetscFunctionBegin; 96 switch (op) { 97 case VEC_IGNORE_OFF_PROC_ENTRIES: V->stash.donotstash = flag; 98 break; 99 case VEC_IGNORE_NEGATIVE_INDICES: V->stash.ignorenegidx = flag; 100 break; 101 case VEC_SUBSET_OFF_PROC_ENTRIES: 102 v->assembly_subset = flag; /* See the same logic in MatAssembly wrt MAT_SUBSET_OFF_PROC_ENTRIES */ 103 if (!v->assembly_subset) { /* User indicates "do not reuse the communication pattern" */ 104 ierr = VecAssemblyReset_MPI(V);CHKERRQ(ierr); /* Reset existing pattern to free memory */ 105 v->first_assembly_done = PETSC_FALSE; /* Mark the first assembly is not done */ 106 } 107 break; 108 } 109 110 PetscFunctionReturn(0); 111 } 112 113 114 static PetscErrorCode VecResetArray_MPI(Vec vin) 115 { 116 Vec_MPI *v = (Vec_MPI*)vin->data; 117 PetscErrorCode ierr; 118 119 PetscFunctionBegin; 120 v->array = v->unplacedarray; 121 v->unplacedarray = 0; 122 if (v->localrep) { 123 ierr = VecResetArray(v->localrep);CHKERRQ(ierr); 124 } 125 PetscFunctionReturn(0); 126 } 127 128 static PetscErrorCode VecAssemblySend_MPI_Private(MPI_Comm comm,const PetscMPIInt tag[],PetscMPIInt rankid,PetscMPIInt rank,void *sdata,MPI_Request req[],void *ctx) 129 { 130 Vec X = (Vec)ctx; 131 Vec_MPI *x = (Vec_MPI*)X->data; 132 VecAssemblyHeader *hdr = (VecAssemblyHeader*)sdata; 133 PetscInt bs = X->map->bs; 134 PetscErrorCode ierr; 135 136 PetscFunctionBegin; 137 /* x->first_assembly_done indicates we are reusing a communication network. In that case, some 138 messages can be empty, but we have to send them this time if we sent them before because the 139 receiver is expecting them. 140 */ 141 if (hdr->count || (x->first_assembly_done && x->sendptrs[rankid].ints)) { 142 ierr = MPI_Isend(x->sendptrs[rankid].ints,hdr->count,MPIU_INT,rank,tag[0],comm,&req[0]);CHKERRQ(ierr); 143 ierr = MPI_Isend(x->sendptrs[rankid].scalars,hdr->count,MPIU_SCALAR,rank,tag[1],comm,&req[1]);CHKERRQ(ierr); 144 } 145 if (hdr->bcount || (x->first_assembly_done && x->sendptrs[rankid].intb)) { 146 ierr = MPI_Isend(x->sendptrs[rankid].intb,hdr->bcount,MPIU_INT,rank,tag[2],comm,&req[2]);CHKERRQ(ierr); 147 ierr = MPI_Isend(x->sendptrs[rankid].scalarb,hdr->bcount*bs,MPIU_SCALAR,rank,tag[3],comm,&req[3]);CHKERRQ(ierr); 148 } 149 PetscFunctionReturn(0); 150 } 151 152 static PetscErrorCode VecAssemblyRecv_MPI_Private(MPI_Comm comm,const PetscMPIInt tag[],PetscMPIInt rank,void *rdata,MPI_Request req[],void *ctx) 153 { 154 Vec X = (Vec)ctx; 155 Vec_MPI *x = (Vec_MPI*)X->data; 156 VecAssemblyHeader *hdr = (VecAssemblyHeader*)rdata; 157 PetscErrorCode ierr; 158 PetscInt bs = X->map->bs; 159 VecAssemblyFrame *frame; 160 161 PetscFunctionBegin; 162 ierr = PetscSegBufferGet(x->segrecvframe,1,&frame);CHKERRQ(ierr); 163 164 if (hdr->count) { 165 ierr = PetscSegBufferGet(x->segrecvint,hdr->count,&frame->ints);CHKERRQ(ierr); 166 ierr = MPI_Irecv(frame->ints,hdr->count,MPIU_INT,rank,tag[0],comm,&req[0]);CHKERRQ(ierr); 167 ierr = PetscSegBufferGet(x->segrecvscalar,hdr->count,&frame->scalars);CHKERRQ(ierr); 168 ierr = MPI_Irecv(frame->scalars,hdr->count,MPIU_SCALAR,rank,tag[1],comm,&req[1]);CHKERRQ(ierr); 169 frame->pendings = 2; 170 } else { 171 frame->ints = NULL; 172 frame->scalars = NULL; 173 frame->pendings = 0; 174 } 175 176 if (hdr->bcount) { 177 ierr = PetscSegBufferGet(x->segrecvint,hdr->bcount,&frame->intb);CHKERRQ(ierr); 178 ierr = MPI_Irecv(frame->intb,hdr->bcount,MPIU_INT,rank,tag[2],comm,&req[2]);CHKERRQ(ierr); 179 ierr = PetscSegBufferGet(x->segrecvscalar,hdr->bcount*bs,&frame->scalarb);CHKERRQ(ierr); 180 ierr = MPI_Irecv(frame->scalarb,hdr->bcount*bs,MPIU_SCALAR,rank,tag[3],comm,&req[3]);CHKERRQ(ierr); 181 frame->pendingb = 2; 182 } else { 183 frame->intb = NULL; 184 frame->scalarb = NULL; 185 frame->pendingb = 0; 186 } 187 PetscFunctionReturn(0); 188 } 189 190 static PetscErrorCode VecAssemblyBegin_MPI_BTS(Vec X) 191 { 192 Vec_MPI *x = (Vec_MPI*)X->data; 193 PetscErrorCode ierr; 194 MPI_Comm comm; 195 PetscInt i,j,jb,bs; 196 197 PetscFunctionBegin; 198 if (X->stash.donotstash) PetscFunctionReturn(0); 199 200 ierr = PetscObjectGetComm((PetscObject)X,&comm);CHKERRQ(ierr); 201 ierr = VecGetBlockSize(X,&bs);CHKERRQ(ierr); 202 if (PetscDefined(USE_DEBUG)) { 203 InsertMode addv; 204 ierr = MPIU_Allreduce((PetscEnum*)&X->stash.insertmode,(PetscEnum*)&addv,1,MPIU_ENUM,MPI_BOR,comm);CHKERRQ(ierr); 205 if (addv == (ADD_VALUES|INSERT_VALUES)) SETERRQ(comm,PETSC_ERR_ARG_NOTSAMETYPE,"Some processors inserted values while others added"); 206 } 207 X->bstash.insertmode = X->stash.insertmode; /* Block stash implicitly tracks InsertMode of scalar stash */ 208 209 ierr = VecStashSortCompress_Private(&X->stash);CHKERRQ(ierr); 210 ierr = VecStashSortCompress_Private(&X->bstash);CHKERRQ(ierr); 211 212 if (!x->sendranks) { 213 PetscMPIInt nowners,bnowners,*owners,*bowners; 214 PetscInt ntmp; 215 ierr = VecStashGetOwnerList_Private(&X->stash,X->map,&nowners,&owners);CHKERRQ(ierr); 216 ierr = VecStashGetOwnerList_Private(&X->bstash,X->map,&bnowners,&bowners);CHKERRQ(ierr); 217 ierr = PetscMergeMPIIntArray(nowners,owners,bnowners,bowners,&ntmp,&x->sendranks);CHKERRQ(ierr); 218 x->nsendranks = ntmp; 219 ierr = PetscFree(owners);CHKERRQ(ierr); 220 ierr = PetscFree(bowners);CHKERRQ(ierr); 221 ierr = PetscMalloc1(x->nsendranks,&x->sendhdr);CHKERRQ(ierr); 222 ierr = PetscCalloc1(x->nsendranks,&x->sendptrs);CHKERRQ(ierr); 223 } 224 for (i=0,j=0,jb=0; i<x->nsendranks; i++) { 225 PetscMPIInt rank = x->sendranks[i]; 226 x->sendhdr[i].insertmode = X->stash.insertmode; 227 /* Initialize pointers for non-empty stashes the first time around. Subsequent assemblies with 228 * VEC_SUBSET_OFF_PROC_ENTRIES will leave the old pointers (dangling because the stash has been collected) when 229 * there is nothing new to send, so that size-zero messages get sent instead. */ 230 x->sendhdr[i].count = 0; 231 if (X->stash.n) { 232 x->sendptrs[i].ints = &X->stash.idx[j]; 233 x->sendptrs[i].scalars = &X->stash.array[j]; 234 for ( ; j<X->stash.n && X->stash.idx[j] < X->map->range[rank+1]; j++) x->sendhdr[i].count++; 235 } 236 x->sendhdr[i].bcount = 0; 237 if (X->bstash.n) { 238 x->sendptrs[i].intb = &X->bstash.idx[jb]; 239 x->sendptrs[i].scalarb = &X->bstash.array[jb*bs]; 240 for ( ; jb<X->bstash.n && X->bstash.idx[jb]*bs < X->map->range[rank+1]; jb++) x->sendhdr[i].bcount++; 241 } 242 } 243 244 if (!x->segrecvint) {ierr = PetscSegBufferCreate(sizeof(PetscInt),1000,&x->segrecvint);CHKERRQ(ierr);} 245 if (!x->segrecvscalar) {ierr = PetscSegBufferCreate(sizeof(PetscScalar),1000,&x->segrecvscalar);CHKERRQ(ierr);} 246 if (!x->segrecvframe) {ierr = PetscSegBufferCreate(sizeof(VecAssemblyFrame),50,&x->segrecvframe);CHKERRQ(ierr);} 247 if (x->first_assembly_done) { /* this is not the first assembly */ 248 PetscMPIInt tag[4]; 249 for (i=0; i<4; i++) {ierr = PetscCommGetNewTag(comm,&tag[i]);CHKERRQ(ierr);} 250 for (i=0; i<x->nsendranks; i++) { 251 ierr = VecAssemblySend_MPI_Private(comm,tag,i,x->sendranks[i],x->sendhdr+i,x->sendreqs+4*i,X);CHKERRQ(ierr); 252 } 253 for (i=0; i<x->nrecvranks; i++) { 254 ierr = VecAssemblyRecv_MPI_Private(comm,tag,x->recvranks[i],x->recvhdr+i,x->recvreqs+4*i,X);CHKERRQ(ierr); 255 } 256 x->use_status = PETSC_TRUE; 257 } else { /* First time assembly */ 258 ierr = PetscCommBuildTwoSidedFReq(comm,3,MPIU_INT,x->nsendranks,x->sendranks,(PetscInt*)x->sendhdr,&x->nrecvranks,&x->recvranks,&x->recvhdr,4,&x->sendreqs,&x->recvreqs,VecAssemblySend_MPI_Private,VecAssemblyRecv_MPI_Private,X);CHKERRQ(ierr); 259 x->use_status = PETSC_FALSE; 260 } 261 262 /* The first_assembly_done flag is only meaningful when x->assembly_subset is set. 263 This line says when assembly_subset is set, then we mark that the first assembly is done. 264 */ 265 x->first_assembly_done = x->assembly_subset; 266 267 { 268 PetscInt nstash,reallocs; 269 ierr = VecStashGetInfo_Private(&X->stash,&nstash,&reallocs);CHKERRQ(ierr); 270 ierr = PetscInfo2(X,"Stash has %D entries, uses %D mallocs.\n",nstash,reallocs);CHKERRQ(ierr); 271 ierr = VecStashGetInfo_Private(&X->bstash,&nstash,&reallocs);CHKERRQ(ierr); 272 ierr = PetscInfo2(X,"Block-Stash has %D entries, uses %D mallocs.\n",nstash,reallocs);CHKERRQ(ierr); 273 } 274 PetscFunctionReturn(0); 275 } 276 277 static PetscErrorCode VecAssemblyEnd_MPI_BTS(Vec X) 278 { 279 Vec_MPI *x = (Vec_MPI*)X->data; 280 PetscInt bs = X->map->bs; 281 PetscMPIInt npending,*some_indices,r; 282 MPI_Status *some_statuses; 283 PetscScalar *xarray; 284 PetscErrorCode ierr; 285 VecAssemblyFrame *frame; 286 287 PetscFunctionBegin; 288 if (X->stash.donotstash) { 289 X->stash.insertmode = NOT_SET_VALUES; 290 X->bstash.insertmode = NOT_SET_VALUES; 291 PetscFunctionReturn(0); 292 } 293 294 if (!x->segrecvframe) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Missing segrecvframe! Probably you forgot to call VecAssemblyBegin first"); 295 ierr = VecGetArray(X,&xarray);CHKERRQ(ierr); 296 ierr = PetscSegBufferExtractInPlace(x->segrecvframe,&frame);CHKERRQ(ierr); 297 ierr = PetscMalloc2(4*x->nrecvranks,&some_indices,x->use_status?4*x->nrecvranks:0,&some_statuses);CHKERRQ(ierr); 298 for (r=0,npending=0; r<x->nrecvranks; r++) npending += frame[r].pendings + frame[r].pendingb; 299 while (npending>0) { 300 PetscMPIInt ndone=0,ii; 301 /* Filling MPI_Status fields requires some resources from the MPI library. We skip it on the first assembly, or 302 * when VEC_SUBSET_OFF_PROC_ENTRIES has not been set, because we could exchange exact sizes in the initial 303 * rendezvous. When the rendezvous is elided, however, we use MPI_Status to get actual message lengths, so that 304 * subsequent assembly can set a proper subset of the values. */ 305 ierr = MPI_Waitsome(4*x->nrecvranks,x->recvreqs,&ndone,some_indices,x->use_status?some_statuses:MPI_STATUSES_IGNORE);CHKERRQ(ierr); 306 for (ii=0; ii<ndone; ii++) { 307 PetscInt i = some_indices[ii]/4,j,k; 308 InsertMode imode = (InsertMode)x->recvhdr[i].insertmode; 309 PetscInt *recvint; 310 PetscScalar *recvscalar; 311 PetscBool intmsg = (PetscBool)(some_indices[ii]%2 == 0); 312 PetscBool blockmsg = (PetscBool)((some_indices[ii]%4)/2 == 1); 313 npending--; 314 if (!blockmsg) { /* Scalar stash */ 315 PetscMPIInt count; 316 if (--frame[i].pendings > 0) continue; 317 if (x->use_status) { 318 ierr = MPI_Get_count(&some_statuses[ii],intmsg ? MPIU_INT : MPIU_SCALAR,&count);CHKERRQ(ierr); 319 } else count = x->recvhdr[i].count; 320 for (j=0,recvint=frame[i].ints,recvscalar=frame[i].scalars; j<count; j++,recvint++) { 321 PetscInt loc = *recvint - X->map->rstart; 322 if (*recvint < X->map->rstart || X->map->rend <= *recvint) SETERRQ3(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Received vector entry %D out of local range [%D,%D)]",*recvint,X->map->rstart,X->map->rend); 323 switch (imode) { 324 case ADD_VALUES: 325 xarray[loc] += *recvscalar++; 326 break; 327 case INSERT_VALUES: 328 xarray[loc] = *recvscalar++; 329 break; 330 default: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"Insert mode not supported 0x%x",imode); 331 } 332 } 333 } else { /* Block stash */ 334 PetscMPIInt count; 335 if (--frame[i].pendingb > 0) continue; 336 if (x->use_status) { 337 ierr = MPI_Get_count(&some_statuses[ii],intmsg ? MPIU_INT : MPIU_SCALAR,&count);CHKERRQ(ierr); 338 if (!intmsg) count /= bs; /* Convert from number of scalars to number of blocks */ 339 } else count = x->recvhdr[i].bcount; 340 for (j=0,recvint=frame[i].intb,recvscalar=frame[i].scalarb; j<count; j++,recvint++) { 341 PetscInt loc = (*recvint)*bs - X->map->rstart; 342 switch (imode) { 343 case ADD_VALUES: 344 for (k=loc; k<loc+bs; k++) xarray[k] += *recvscalar++; 345 break; 346 case INSERT_VALUES: 347 for (k=loc; k<loc+bs; k++) xarray[k] = *recvscalar++; 348 break; 349 default: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"Insert mode not supported 0x%x",imode); 350 } 351 } 352 } 353 } 354 } 355 ierr = VecRestoreArray(X,&xarray);CHKERRQ(ierr); 356 ierr = MPI_Waitall(4*x->nsendranks,x->sendreqs,MPI_STATUSES_IGNORE);CHKERRQ(ierr); 357 ierr = PetscFree2(some_indices,some_statuses);CHKERRQ(ierr); 358 if (x->assembly_subset) { 359 void *dummy; /* reset segbuffers */ 360 ierr = PetscSegBufferExtractInPlace(x->segrecvint,&dummy);CHKERRQ(ierr); 361 ierr = PetscSegBufferExtractInPlace(x->segrecvscalar,&dummy);CHKERRQ(ierr); 362 } else { 363 ierr = VecAssemblyReset_MPI(X);CHKERRQ(ierr); 364 } 365 366 X->stash.insertmode = NOT_SET_VALUES; 367 X->bstash.insertmode = NOT_SET_VALUES; 368 ierr = VecStashScatterEnd_Private(&X->stash);CHKERRQ(ierr); 369 ierr = VecStashScatterEnd_Private(&X->bstash);CHKERRQ(ierr); 370 PetscFunctionReturn(0); 371 } 372 373 PetscErrorCode VecAssemblyReset_MPI(Vec X) 374 { 375 Vec_MPI *x = (Vec_MPI*)X->data; 376 PetscErrorCode ierr; 377 378 PetscFunctionBegin; 379 ierr = PetscFree(x->sendreqs);CHKERRQ(ierr); 380 ierr = PetscFree(x->recvreqs);CHKERRQ(ierr); 381 ierr = PetscFree(x->sendranks);CHKERRQ(ierr); 382 ierr = PetscFree(x->recvranks);CHKERRQ(ierr); 383 ierr = PetscFree(x->sendhdr);CHKERRQ(ierr); 384 ierr = PetscFree(x->recvhdr);CHKERRQ(ierr); 385 ierr = PetscFree(x->sendptrs);CHKERRQ(ierr); 386 ierr = PetscSegBufferDestroy(&x->segrecvint);CHKERRQ(ierr); 387 ierr = PetscSegBufferDestroy(&x->segrecvscalar);CHKERRQ(ierr); 388 ierr = PetscSegBufferDestroy(&x->segrecvframe);CHKERRQ(ierr); 389 PetscFunctionReturn(0); 390 } 391 392 393 static PetscErrorCode VecSetFromOptions_MPI(PetscOptionItems *PetscOptionsObject,Vec X) 394 { 395 #if !defined(PETSC_HAVE_MPIUNI) 396 PetscErrorCode ierr; 397 PetscBool flg = PETSC_FALSE,set; 398 399 PetscFunctionBegin; 400 ierr = PetscOptionsHead(PetscOptionsObject,"VecMPI Options");CHKERRQ(ierr); 401 ierr = PetscOptionsBool("-vec_assembly_legacy","Use MPI 1 version of assembly","",flg,&flg,&set);CHKERRQ(ierr); 402 if (set) { 403 X->ops->assemblybegin = flg ? VecAssemblyBegin_MPI : VecAssemblyBegin_MPI_BTS; 404 X->ops->assemblyend = flg ? VecAssemblyEnd_MPI : VecAssemblyEnd_MPI_BTS; 405 } 406 ierr = PetscOptionsTail();CHKERRQ(ierr); 407 #else 408 X->ops->assemblybegin = VecAssemblyBegin_MPI; 409 X->ops->assemblyend = VecAssemblyEnd_MPI; 410 #endif 411 PetscFunctionReturn(0); 412 } 413 414 415 static struct _VecOps DvOps = { VecDuplicate_MPI, /* 1 */ 416 VecDuplicateVecs_Default, 417 VecDestroyVecs_Default, 418 VecDot_MPI, 419 VecMDot_MPI, 420 VecNorm_MPI, 421 VecTDot_MPI, 422 VecMTDot_MPI, 423 VecScale_Seq, 424 VecCopy_Seq, /* 10 */ 425 VecSet_Seq, 426 VecSwap_Seq, 427 VecAXPY_Seq, 428 VecAXPBY_Seq, 429 VecMAXPY_Seq, 430 VecAYPX_Seq, 431 VecWAXPY_Seq, 432 VecAXPBYPCZ_Seq, 433 VecPointwiseMult_Seq, 434 VecPointwiseDivide_Seq, 435 VecSetValues_MPI, /* 20 */ 436 VecAssemblyBegin_MPI_BTS, 437 VecAssemblyEnd_MPI_BTS, 438 0, 439 VecGetSize_MPI, 440 VecGetSize_Seq, 441 0, 442 VecMax_MPI, 443 VecMin_MPI, 444 VecSetRandom_Seq, 445 VecSetOption_MPI, 446 VecSetValuesBlocked_MPI, 447 VecDestroy_MPI, 448 VecView_MPI, 449 VecPlaceArray_MPI, 450 VecReplaceArray_Seq, 451 VecDot_Seq, 452 VecTDot_Seq, 453 VecNorm_Seq, 454 VecMDot_Seq, 455 VecMTDot_Seq, 456 VecLoad_Default, 457 VecReciprocal_Default, 458 VecConjugate_Seq, 459 0, 460 0, 461 VecResetArray_MPI, 462 VecSetFromOptions_MPI,/*set from options */ 463 VecMaxPointwiseDivide_Seq, 464 VecPointwiseMax_Seq, 465 VecPointwiseMaxAbs_Seq, 466 VecPointwiseMin_Seq, 467 VecGetValues_MPI, 468 0, 469 0, 470 0, 471 0, 472 0, 473 0, 474 VecStrideGather_Default, 475 VecStrideScatter_Default, 476 0, 477 0, 478 0, 479 0, 480 0, 481 VecStrideSubSetGather_Default, 482 VecStrideSubSetScatter_Default, 483 0, 484 0 485 }; 486 487 /* 488 VecCreate_MPI_Private - Basic create routine called by VecCreate_MPI() (i.e. VecCreateMPI()), 489 VecCreateMPIWithArray(), VecCreate_Shared() (i.e. VecCreateShared()), VecCreateGhost(), 490 VecDuplicate_MPI(), VecCreateGhostWithArray(), VecDuplicate_MPI(), and VecDuplicate_Shared() 491 492 If alloc is true and array is NULL then this routine allocates the space, otherwise 493 no space is allocated. 494 */ 495 PetscErrorCode VecCreate_MPI_Private(Vec v,PetscBool alloc,PetscInt nghost,const PetscScalar array[]) 496 { 497 Vec_MPI *s; 498 PetscErrorCode ierr; 499 500 PetscFunctionBegin; 501 ierr = PetscNewLog(v,&s);CHKERRQ(ierr); 502 v->data = (void*)s; 503 ierr = PetscMemcpy(v->ops,&DvOps,sizeof(DvOps));CHKERRQ(ierr); 504 s->nghost = nghost; 505 v->petscnative = PETSC_TRUE; 506 507 ierr = PetscLayoutSetUp(v->map);CHKERRQ(ierr); 508 509 s->array = (PetscScalar*)array; 510 s->array_allocated = 0; 511 if (alloc && !array) { 512 PetscInt n = v->map->n+nghost; 513 ierr = PetscCalloc1(n,&s->array);CHKERRQ(ierr); 514 ierr = PetscLogObjectMemory((PetscObject)v,n*sizeof(PetscScalar));CHKERRQ(ierr); 515 s->array_allocated = s->array; 516 } 517 518 /* By default parallel vectors do not have local representation */ 519 s->localrep = 0; 520 s->localupdate = 0; 521 522 v->stash.insertmode = NOT_SET_VALUES; 523 v->bstash.insertmode = NOT_SET_VALUES; 524 /* create the stashes. The block-size for bstash is set later when 525 VecSetValuesBlocked is called. 526 */ 527 ierr = VecStashCreate_Private(PetscObjectComm((PetscObject)v),1,&v->stash);CHKERRQ(ierr); 528 ierr = VecStashCreate_Private(PetscObjectComm((PetscObject)v),PetscAbs(v->map->bs),&v->bstash);CHKERRQ(ierr); 529 530 #if defined(PETSC_HAVE_MATLAB_ENGINE) 531 ierr = PetscObjectComposeFunction((PetscObject)v,"PetscMatlabEnginePut_C",VecMatlabEnginePut_Default);CHKERRQ(ierr); 532 ierr = PetscObjectComposeFunction((PetscObject)v,"PetscMatlabEngineGet_C",VecMatlabEngineGet_Default);CHKERRQ(ierr); 533 #endif 534 ierr = PetscObjectChangeTypeName((PetscObject)v,VECMPI);CHKERRQ(ierr); 535 PetscFunctionReturn(0); 536 } 537 538 /*MC 539 VECMPI - VECMPI = "mpi" - The basic parallel vector 540 541 Options Database Keys: 542 . -vec_type mpi - sets the vector type to VECMPI during a call to VecSetFromOptions() 543 544 Level: beginner 545 546 .seealso: VecCreate(), VecSetType(), VecSetFromOptions(), VecCreateMPIWithArray(), VECMPI, VecType, VecCreateMPI(), VecCreateMPI() 547 M*/ 548 549 PETSC_EXTERN PetscErrorCode VecCreate_MPI(Vec vv) 550 { 551 PetscErrorCode ierr; 552 553 PetscFunctionBegin; 554 ierr = VecCreate_MPI_Private(vv,PETSC_TRUE,0,0);CHKERRQ(ierr); 555 PetscFunctionReturn(0); 556 } 557 558 /*MC 559 VECSTANDARD = "standard" - A VECSEQ on one process and VECMPI on more than one process 560 561 Options Database Keys: 562 . -vec_type standard - sets a vector type to standard on calls to VecSetFromOptions() 563 564 Level: beginner 565 566 .seealso: VecCreateSeq(), VecCreateMPI() 567 M*/ 568 569 PETSC_EXTERN PetscErrorCode VecCreate_Standard(Vec v) 570 { 571 PetscErrorCode ierr; 572 PetscMPIInt size; 573 574 PetscFunctionBegin; 575 ierr = MPI_Comm_size(PetscObjectComm((PetscObject)v),&size);CHKERRQ(ierr); 576 if (size == 1) { 577 ierr = VecSetType(v,VECSEQ);CHKERRQ(ierr); 578 } else { 579 ierr = VecSetType(v,VECMPI);CHKERRQ(ierr); 580 } 581 PetscFunctionReturn(0); 582 } 583 584 /*@C 585 VecCreateMPIWithArray - Creates a parallel, array-style vector, 586 where the user provides the array space to store the vector values. 587 588 Collective 589 590 Input Parameters: 591 + comm - the MPI communicator to use 592 . bs - block size, same meaning as VecSetBlockSize() 593 . n - local vector length, cannot be PETSC_DECIDE 594 . N - global vector length (or PETSC_DECIDE to have calculated) 595 - array - the user provided array to store the vector values 596 597 Output Parameter: 598 . vv - the vector 599 600 Notes: 601 Use VecDuplicate() or VecDuplicateVecs() to form additional vectors of the 602 same type as an existing vector. 603 604 If the user-provided array is NULL, then VecPlaceArray() can be used 605 at a later stage to SET the array for storing the vector values. 606 607 PETSc does NOT free the array when the vector is destroyed via VecDestroy(). 608 The user should not free the array until the vector is destroyed. 609 610 Level: intermediate 611 612 .seealso: VecCreateSeqWithArray(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateGhost(), 613 VecCreateMPI(), VecCreateGhostWithArray(), VecPlaceArray() 614 615 @*/ 616 PetscErrorCode VecCreateMPIWithArray(MPI_Comm comm,PetscInt bs,PetscInt n,PetscInt N,const PetscScalar array[],Vec *vv) 617 { 618 PetscErrorCode ierr; 619 620 PetscFunctionBegin; 621 if (n == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local size of vector"); 622 ierr = PetscSplitOwnership(comm,&n,&N);CHKERRQ(ierr); 623 ierr = VecCreate(comm,vv);CHKERRQ(ierr); 624 ierr = VecSetSizes(*vv,n,N);CHKERRQ(ierr); 625 ierr = VecSetBlockSize(*vv,bs);CHKERRQ(ierr); 626 ierr = VecCreate_MPI_Private(*vv,PETSC_FALSE,0,array);CHKERRQ(ierr); 627 PetscFunctionReturn(0); 628 } 629 630 /*@C 631 VecCreateGhostWithArray - Creates a parallel vector with ghost padding on each processor; 632 the caller allocates the array space. 633 634 Collective 635 636 Input Parameters: 637 + comm - the MPI communicator to use 638 . n - local vector length 639 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 640 . nghost - number of local ghost points 641 . ghosts - global indices of ghost points (or NULL if not needed), these do not need to be in increasing order (sorted) 642 - array - the space to store the vector values (as long as n + nghost) 643 644 Output Parameter: 645 . vv - the global vector representation (without ghost points as part of vector) 646 647 Notes: 648 Use VecGhostGetLocalForm() to access the local, ghosted representation 649 of the vector. 650 651 This also automatically sets the ISLocalToGlobalMapping() for this vector. 652 653 Level: advanced 654 655 656 .seealso: VecCreate(), VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), 657 VecCreateGhost(), VecCreateSeqWithArray(), VecCreateMPIWithArray(), 658 VecCreateGhostBlock(), VecCreateGhostBlockWithArray(), VecMPISetGhost() 659 660 @*/ 661 PetscErrorCode VecCreateGhostWithArray(MPI_Comm comm,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],const PetscScalar array[],Vec *vv) 662 { 663 PetscErrorCode ierr; 664 Vec_MPI *w; 665 PetscScalar *larray; 666 IS from,to; 667 ISLocalToGlobalMapping ltog; 668 PetscInt rstart,i,*indices; 669 670 PetscFunctionBegin; 671 *vv = 0; 672 673 if (n == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local size"); 674 if (nghost == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local ghost size"); 675 if (nghost < 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Ghost length must be >= 0"); 676 ierr = PetscSplitOwnership(comm,&n,&N);CHKERRQ(ierr); 677 /* Create global representation */ 678 ierr = VecCreate(comm,vv);CHKERRQ(ierr); 679 ierr = VecSetSizes(*vv,n,N);CHKERRQ(ierr); 680 ierr = VecCreate_MPI_Private(*vv,PETSC_TRUE,nghost,array);CHKERRQ(ierr); 681 w = (Vec_MPI*)(*vv)->data; 682 /* Create local representation */ 683 ierr = VecGetArray(*vv,&larray);CHKERRQ(ierr); 684 ierr = VecCreateSeqWithArray(PETSC_COMM_SELF,1,n+nghost,larray,&w->localrep);CHKERRQ(ierr); 685 ierr = PetscLogObjectParent((PetscObject)*vv,(PetscObject)w->localrep);CHKERRQ(ierr); 686 ierr = VecRestoreArray(*vv,&larray);CHKERRQ(ierr); 687 688 /* 689 Create scatter context for scattering (updating) ghost values 690 */ 691 ierr = ISCreateGeneral(comm,nghost,ghosts,PETSC_COPY_VALUES,&from);CHKERRQ(ierr); 692 ierr = ISCreateStride(PETSC_COMM_SELF,nghost,n,1,&to);CHKERRQ(ierr); 693 ierr = VecScatterCreate(*vv,from,w->localrep,to,&w->localupdate);CHKERRQ(ierr); 694 ierr = PetscLogObjectParent((PetscObject)*vv,(PetscObject)w->localupdate);CHKERRQ(ierr); 695 ierr = ISDestroy(&to);CHKERRQ(ierr); 696 ierr = ISDestroy(&from);CHKERRQ(ierr); 697 698 /* set local to global mapping for ghosted vector */ 699 ierr = PetscMalloc1(n+nghost,&indices);CHKERRQ(ierr); 700 ierr = VecGetOwnershipRange(*vv,&rstart,NULL);CHKERRQ(ierr); 701 for (i=0; i<n; i++) { 702 indices[i] = rstart + i; 703 } 704 for (i=0; i<nghost; i++) { 705 indices[n+i] = ghosts[i]; 706 } 707 ierr = ISLocalToGlobalMappingCreate(comm,1,n+nghost,indices,PETSC_OWN_POINTER,<og);CHKERRQ(ierr); 708 ierr = VecSetLocalToGlobalMapping(*vv,ltog);CHKERRQ(ierr); 709 ierr = ISLocalToGlobalMappingDestroy(<og);CHKERRQ(ierr); 710 PetscFunctionReturn(0); 711 } 712 713 /*@ 714 VecCreateGhost - Creates a parallel vector with ghost padding on each processor. 715 716 Collective 717 718 Input Parameters: 719 + comm - the MPI communicator to use 720 . n - local vector length 721 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 722 . nghost - number of local ghost points 723 - ghosts - global indices of ghost points, these do not need to be in increasing order (sorted) 724 725 Output Parameter: 726 . vv - the global vector representation (without ghost points as part of vector) 727 728 Notes: 729 Use VecGhostGetLocalForm() to access the local, ghosted representation 730 of the vector. 731 732 This also automatically sets the ISLocalToGlobalMapping() for this vector. 733 734 Level: advanced 735 736 .seealso: VecCreateSeq(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateMPI(), 737 VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), VecGhostUpdateBegin(), 738 VecCreateGhostWithArray(), VecCreateMPIWithArray(), VecGhostUpdateEnd(), 739 VecCreateGhostBlock(), VecCreateGhostBlockWithArray(), VecMPISetGhost() 740 741 @*/ 742 PetscErrorCode VecCreateGhost(MPI_Comm comm,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],Vec *vv) 743 { 744 PetscErrorCode ierr; 745 746 PetscFunctionBegin; 747 ierr = VecCreateGhostWithArray(comm,n,N,nghost,ghosts,0,vv);CHKERRQ(ierr); 748 PetscFunctionReturn(0); 749 } 750 751 /*@ 752 VecMPISetGhost - Sets the ghost points for an MPI ghost vector 753 754 Collective on Vec 755 756 Input Parameters: 757 + vv - the MPI vector 758 . nghost - number of local ghost points 759 - ghosts - global indices of ghost points, these do not need to be in increasing order (sorted) 760 761 762 Notes: 763 Use VecGhostGetLocalForm() to access the local, ghosted representation 764 of the vector. 765 766 This also automatically sets the ISLocalToGlobalMapping() for this vector. 767 768 You must call this AFTER you have set the type of the vector (with VecSetType()) and the size (with VecSetSizes()). 769 770 Level: advanced 771 772 .seealso: VecCreateSeq(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateMPI(), 773 VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), VecGhostUpdateBegin(), 774 VecCreateGhostWithArray(), VecCreateMPIWithArray(), VecGhostUpdateEnd(), 775 VecCreateGhostBlock(), VecCreateGhostBlockWithArray() 776 777 @*/ 778 PetscErrorCode VecMPISetGhost(Vec vv,PetscInt nghost,const PetscInt ghosts[]) 779 { 780 PetscErrorCode ierr; 781 PetscBool flg; 782 783 PetscFunctionBegin; 784 ierr = PetscObjectTypeCompare((PetscObject)vv,VECMPI,&flg);CHKERRQ(ierr); 785 /* if already fully existant VECMPI then basically destroy it and rebuild with ghosting */ 786 if (flg) { 787 PetscInt n,N; 788 Vec_MPI *w; 789 PetscScalar *larray; 790 IS from,to; 791 ISLocalToGlobalMapping ltog; 792 PetscInt rstart,i,*indices; 793 MPI_Comm comm; 794 795 ierr = PetscObjectGetComm((PetscObject)vv,&comm);CHKERRQ(ierr); 796 n = vv->map->n; 797 N = vv->map->N; 798 ierr = (*vv->ops->destroy)(vv);CHKERRQ(ierr); 799 ierr = VecSetSizes(vv,n,N);CHKERRQ(ierr); 800 ierr = VecCreate_MPI_Private(vv,PETSC_TRUE,nghost,NULL);CHKERRQ(ierr); 801 w = (Vec_MPI*)(vv)->data; 802 /* Create local representation */ 803 ierr = VecGetArray(vv,&larray);CHKERRQ(ierr); 804 ierr = VecCreateSeqWithArray(PETSC_COMM_SELF,1,n+nghost,larray,&w->localrep);CHKERRQ(ierr); 805 ierr = PetscLogObjectParent((PetscObject)vv,(PetscObject)w->localrep);CHKERRQ(ierr); 806 ierr = VecRestoreArray(vv,&larray);CHKERRQ(ierr); 807 808 /* 809 Create scatter context for scattering (updating) ghost values 810 */ 811 ierr = ISCreateGeneral(comm,nghost,ghosts,PETSC_COPY_VALUES,&from);CHKERRQ(ierr); 812 ierr = ISCreateStride(PETSC_COMM_SELF,nghost,n,1,&to);CHKERRQ(ierr); 813 ierr = VecScatterCreate(vv,from,w->localrep,to,&w->localupdate);CHKERRQ(ierr); 814 ierr = PetscLogObjectParent((PetscObject)vv,(PetscObject)w->localupdate);CHKERRQ(ierr); 815 ierr = ISDestroy(&to);CHKERRQ(ierr); 816 ierr = ISDestroy(&from);CHKERRQ(ierr); 817 818 /* set local to global mapping for ghosted vector */ 819 ierr = PetscMalloc1(n+nghost,&indices);CHKERRQ(ierr); 820 ierr = VecGetOwnershipRange(vv,&rstart,NULL);CHKERRQ(ierr); 821 822 for (i=0; i<n; i++) indices[i] = rstart + i; 823 for (i=0; i<nghost; i++) indices[n+i] = ghosts[i]; 824 825 ierr = ISLocalToGlobalMappingCreate(comm,1,n+nghost,indices,PETSC_OWN_POINTER,<og);CHKERRQ(ierr); 826 ierr = VecSetLocalToGlobalMapping(vv,ltog);CHKERRQ(ierr); 827 ierr = ISLocalToGlobalMappingDestroy(<og);CHKERRQ(ierr); 828 } else if (vv->ops->create == VecCreate_MPI) SETERRQ(PetscObjectComm((PetscObject)vv),PETSC_ERR_ARG_WRONGSTATE,"Must set local or global size before setting ghosting"); 829 else if (!((PetscObject)vv)->type_name) SETERRQ(PetscObjectComm((PetscObject)vv),PETSC_ERR_ARG_WRONGSTATE,"Must set type to VECMPI before ghosting"); 830 PetscFunctionReturn(0); 831 } 832 833 834 /* ------------------------------------------------------------------------------------------*/ 835 /*@C 836 VecCreateGhostBlockWithArray - Creates a parallel vector with ghost padding on each processor; 837 the caller allocates the array space. Indices in the ghost region are based on blocks. 838 839 Collective 840 841 Input Parameters: 842 + comm - the MPI communicator to use 843 . bs - block size 844 . n - local vector length 845 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 846 . nghost - number of local ghost blocks 847 . 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) 848 - array - the space to store the vector values (as long as n + nghost*bs) 849 850 Output Parameter: 851 . vv - the global vector representation (without ghost points as part of vector) 852 853 Notes: 854 Use VecGhostGetLocalForm() to access the local, ghosted representation 855 of the vector. 856 857 n is the local vector size (total local size not the number of blocks) while nghost 858 is the number of blocks in the ghost portion, i.e. the number of elements in the ghost 859 portion is bs*nghost 860 861 Level: advanced 862 863 864 .seealso: VecCreate(), VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), 865 VecCreateGhost(), VecCreateSeqWithArray(), VecCreateMPIWithArray(), 866 VecCreateGhostWithArray(), VecCreateGhostBlock() 867 868 @*/ 869 PetscErrorCode VecCreateGhostBlockWithArray(MPI_Comm comm,PetscInt bs,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],const PetscScalar array[],Vec *vv) 870 { 871 PetscErrorCode ierr; 872 Vec_MPI *w; 873 PetscScalar *larray; 874 IS from,to; 875 ISLocalToGlobalMapping ltog; 876 PetscInt rstart,i,nb,*indices; 877 878 PetscFunctionBegin; 879 *vv = 0; 880 881 if (n == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local size"); 882 if (nghost == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local ghost size"); 883 if (nghost < 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Ghost length must be >= 0"); 884 if (n % bs) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_INCOMP,"Local size must be a multiple of block size"); 885 ierr = PetscSplitOwnership(comm,&n,&N);CHKERRQ(ierr); 886 /* Create global representation */ 887 ierr = VecCreate(comm,vv);CHKERRQ(ierr); 888 ierr = VecSetSizes(*vv,n,N);CHKERRQ(ierr); 889 ierr = VecSetBlockSize(*vv,bs);CHKERRQ(ierr); 890 ierr = VecCreate_MPI_Private(*vv,PETSC_TRUE,nghost*bs,array);CHKERRQ(ierr); 891 w = (Vec_MPI*)(*vv)->data; 892 /* Create local representation */ 893 ierr = VecGetArray(*vv,&larray);CHKERRQ(ierr); 894 ierr = VecCreateSeqWithArray(PETSC_COMM_SELF,bs,n+bs*nghost,larray,&w->localrep);CHKERRQ(ierr); 895 ierr = PetscLogObjectParent((PetscObject)*vv,(PetscObject)w->localrep);CHKERRQ(ierr); 896 ierr = VecRestoreArray(*vv,&larray);CHKERRQ(ierr); 897 898 /* 899 Create scatter context for scattering (updating) ghost values 900 */ 901 ierr = ISCreateBlock(comm,bs,nghost,ghosts,PETSC_COPY_VALUES,&from);CHKERRQ(ierr); 902 ierr = ISCreateStride(PETSC_COMM_SELF,bs*nghost,n,1,&to);CHKERRQ(ierr); 903 ierr = VecScatterCreate(*vv,from,w->localrep,to,&w->localupdate);CHKERRQ(ierr); 904 ierr = PetscLogObjectParent((PetscObject)*vv,(PetscObject)w->localupdate);CHKERRQ(ierr); 905 ierr = ISDestroy(&to);CHKERRQ(ierr); 906 ierr = ISDestroy(&from);CHKERRQ(ierr); 907 908 /* set local to global mapping for ghosted vector */ 909 nb = n/bs; 910 ierr = PetscMalloc1(nb+nghost,&indices);CHKERRQ(ierr); 911 ierr = VecGetOwnershipRange(*vv,&rstart,NULL);CHKERRQ(ierr); 912 rstart = rstart/bs; 913 914 for (i=0; i<nb; i++) indices[i] = rstart + i; 915 for (i=0; i<nghost; i++) indices[nb+i] = ghosts[i]; 916 917 ierr = ISLocalToGlobalMappingCreate(comm,bs,nb+nghost,indices,PETSC_OWN_POINTER,<og);CHKERRQ(ierr); 918 ierr = VecSetLocalToGlobalMapping(*vv,ltog);CHKERRQ(ierr); 919 ierr = ISLocalToGlobalMappingDestroy(<og);CHKERRQ(ierr); 920 PetscFunctionReturn(0); 921 } 922 923 /*@ 924 VecCreateGhostBlock - Creates a parallel vector with ghost padding on each processor. 925 The indicing of the ghost points is done with blocks. 926 927 Collective 928 929 Input Parameters: 930 + comm - the MPI communicator to use 931 . bs - the block size 932 . n - local vector length 933 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 934 . nghost - number of local ghost blocks 935 - ghosts - global indices of ghost blocks, counts are by block, not by individual index, these do not need to be in increasing order (sorted) 936 937 Output Parameter: 938 . vv - the global vector representation (without ghost points as part of vector) 939 940 Notes: 941 Use VecGhostGetLocalForm() to access the local, ghosted representation 942 of the vector. 943 944 n is the local vector size (total local size not the number of blocks) while nghost 945 is the number of blocks in the ghost portion, i.e. the number of elements in the ghost 946 portion is bs*nghost 947 948 Level: advanced 949 950 .seealso: VecCreateSeq(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateMPI(), 951 VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), 952 VecCreateGhostWithArray(), VecCreateMPIWithArray(), VecCreateGhostBlockWithArray() 953 954 @*/ 955 PetscErrorCode VecCreateGhostBlock(MPI_Comm comm,PetscInt bs,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],Vec *vv) 956 { 957 PetscErrorCode ierr; 958 959 PetscFunctionBegin; 960 ierr = VecCreateGhostBlockWithArray(comm,bs,n,N,nghost,ghosts,0,vv);CHKERRQ(ierr); 961 PetscFunctionReturn(0); 962 } 963