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 defined(PETSC_USE_DEBUG) 203 { 204 InsertMode addv; 205 ierr = MPIU_Allreduce((PetscEnum*)&X->stash.insertmode,(PetscEnum*)&addv,1,MPIU_ENUM,MPI_BOR,comm);CHKERRQ(ierr); 206 if (addv == (ADD_VALUES|INSERT_VALUES)) SETERRQ(comm,PETSC_ERR_ARG_NOTSAMETYPE,"Some processors inserted values while others added"); 207 } 208 #endif 209 X->bstash.insertmode = X->stash.insertmode; /* Block stash implicitly tracks InsertMode of scalar stash */ 210 211 ierr = VecStashSortCompress_Private(&X->stash);CHKERRQ(ierr); 212 ierr = VecStashSortCompress_Private(&X->bstash);CHKERRQ(ierr); 213 214 if (!x->sendranks) { 215 PetscMPIInt nowners,bnowners,*owners,*bowners; 216 PetscInt ntmp; 217 ierr = VecStashGetOwnerList_Private(&X->stash,X->map,&nowners,&owners);CHKERRQ(ierr); 218 ierr = VecStashGetOwnerList_Private(&X->bstash,X->map,&bnowners,&bowners);CHKERRQ(ierr); 219 ierr = PetscMergeMPIIntArray(nowners,owners,bnowners,bowners,&ntmp,&x->sendranks);CHKERRQ(ierr); 220 x->nsendranks = ntmp; 221 ierr = PetscFree(owners);CHKERRQ(ierr); 222 ierr = PetscFree(bowners);CHKERRQ(ierr); 223 ierr = PetscMalloc1(x->nsendranks,&x->sendhdr);CHKERRQ(ierr); 224 ierr = PetscCalloc1(x->nsendranks,&x->sendptrs);CHKERRQ(ierr); 225 } 226 for (i=0,j=0,jb=0; i<x->nsendranks; i++) { 227 PetscMPIInt rank = x->sendranks[i]; 228 x->sendhdr[i].insertmode = X->stash.insertmode; 229 /* Initialize pointers for non-empty stashes the first time around. Subsequent assemblies with 230 * VEC_SUBSET_OFF_PROC_ENTRIES will leave the old pointers (dangling because the stash has been collected) when 231 * there is nothing new to send, so that size-zero messages get sent instead. */ 232 x->sendhdr[i].count = 0; 233 if (X->stash.n) { 234 x->sendptrs[i].ints = &X->stash.idx[j]; 235 x->sendptrs[i].scalars = &X->stash.array[j]; 236 for ( ; j<X->stash.n && X->stash.idx[j] < X->map->range[rank+1]; j++) x->sendhdr[i].count++; 237 } 238 x->sendhdr[i].bcount = 0; 239 if (X->bstash.n) { 240 x->sendptrs[i].intb = &X->bstash.idx[jb]; 241 x->sendptrs[i].scalarb = &X->bstash.array[jb*bs]; 242 for ( ; jb<X->bstash.n && X->bstash.idx[jb]*bs < X->map->range[rank+1]; jb++) x->sendhdr[i].bcount++; 243 } 244 } 245 246 if (!x->segrecvint) {ierr = PetscSegBufferCreate(sizeof(PetscInt),1000,&x->segrecvint);CHKERRQ(ierr);} 247 if (!x->segrecvscalar) {ierr = PetscSegBufferCreate(sizeof(PetscScalar),1000,&x->segrecvscalar);CHKERRQ(ierr);} 248 if (!x->segrecvframe) {ierr = PetscSegBufferCreate(sizeof(VecAssemblyFrame),50,&x->segrecvframe);CHKERRQ(ierr);} 249 if (x->first_assembly_done) { /* this is not the first assembly */ 250 PetscMPIInt tag[4]; 251 for (i=0; i<4; i++) {ierr = PetscCommGetNewTag(comm,&tag[i]);CHKERRQ(ierr);} 252 for (i=0; i<x->nsendranks; i++) { 253 ierr = VecAssemblySend_MPI_Private(comm,tag,i,x->sendranks[i],x->sendhdr+i,x->sendreqs+4*i,X);CHKERRQ(ierr); 254 } 255 for (i=0; i<x->nrecvranks; i++) { 256 ierr = VecAssemblyRecv_MPI_Private(comm,tag,x->recvranks[i],x->recvhdr+i,x->recvreqs+4*i,X);CHKERRQ(ierr); 257 } 258 x->use_status = PETSC_TRUE; 259 } else { /* First time assembly */ 260 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); 261 x->use_status = PETSC_FALSE; 262 } 263 264 /* The first_assembly_done flag is only meaningful when x->assembly_subset is set. 265 This line says when assembly_subset is set, then we mark that the first assembly is done. 266 */ 267 x->first_assembly_done = x->assembly_subset; 268 269 { 270 PetscInt nstash,reallocs; 271 ierr = VecStashGetInfo_Private(&X->stash,&nstash,&reallocs);CHKERRQ(ierr); 272 ierr = PetscInfo2(X,"Stash has %D entries, uses %D mallocs.\n",nstash,reallocs);CHKERRQ(ierr); 273 ierr = VecStashGetInfo_Private(&X->bstash,&nstash,&reallocs);CHKERRQ(ierr); 274 ierr = PetscInfo2(X,"Block-Stash has %D entries, uses %D mallocs.\n",nstash,reallocs);CHKERRQ(ierr); 275 } 276 PetscFunctionReturn(0); 277 } 278 279 static PetscErrorCode VecAssemblyEnd_MPI_BTS(Vec X) 280 { 281 Vec_MPI *x = (Vec_MPI*)X->data; 282 PetscInt bs = X->map->bs; 283 PetscMPIInt npending,*some_indices,r; 284 MPI_Status *some_statuses; 285 PetscScalar *xarray; 286 PetscErrorCode ierr; 287 VecAssemblyFrame *frame; 288 289 PetscFunctionBegin; 290 if (X->stash.donotstash) { 291 X->stash.insertmode = NOT_SET_VALUES; 292 X->bstash.insertmode = NOT_SET_VALUES; 293 PetscFunctionReturn(0); 294 } 295 296 if (!x->segrecvframe) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_PLIB,"Missing segrecvframe! Probably you forgot to call VecAssemblyBegin first"); 297 ierr = VecGetArray(X,&xarray);CHKERRQ(ierr); 298 ierr = PetscSegBufferExtractInPlace(x->segrecvframe,&frame);CHKERRQ(ierr); 299 ierr = PetscMalloc2(4*x->nrecvranks,&some_indices,x->use_status?4*x->nrecvranks:0,&some_statuses);CHKERRQ(ierr); 300 for (r=0,npending=0; r<x->nrecvranks; r++) npending += frame[r].pendings + frame[r].pendingb; 301 while (npending>0) { 302 PetscMPIInt ndone=0,ii; 303 /* Filling MPI_Status fields requires some resources from the MPI library. We skip it on the first assembly, or 304 * when VEC_SUBSET_OFF_PROC_ENTRIES has not been set, because we could exchange exact sizes in the initial 305 * rendezvous. When the rendezvous is elided, however, we use MPI_Status to get actual message lengths, so that 306 * subsequent assembly can set a proper subset of the values. */ 307 ierr = MPI_Waitsome(4*x->nrecvranks,x->recvreqs,&ndone,some_indices,x->use_status?some_statuses:MPI_STATUSES_IGNORE);CHKERRQ(ierr); 308 for (ii=0; ii<ndone; ii++) { 309 PetscInt i = some_indices[ii]/4,j,k; 310 InsertMode imode = (InsertMode)x->recvhdr[i].insertmode; 311 PetscInt *recvint; 312 PetscScalar *recvscalar; 313 PetscBool intmsg = (PetscBool)(some_indices[ii]%2 == 0); 314 PetscBool blockmsg = (PetscBool)((some_indices[ii]%4)/2 == 1); 315 npending--; 316 if (!blockmsg) { /* Scalar stash */ 317 PetscMPIInt count; 318 if (--frame[i].pendings > 0) continue; 319 if (x->use_status) { 320 ierr = MPI_Get_count(&some_statuses[ii],intmsg ? MPIU_INT : MPIU_SCALAR,&count);CHKERRQ(ierr); 321 } else count = x->recvhdr[i].count; 322 for (j=0,recvint=frame[i].ints,recvscalar=frame[i].scalars; j<count; j++,recvint++) { 323 PetscInt loc = *recvint - X->map->rstart; 324 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); 325 switch (imode) { 326 case ADD_VALUES: 327 xarray[loc] += *recvscalar++; 328 break; 329 case INSERT_VALUES: 330 xarray[loc] = *recvscalar++; 331 break; 332 default: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"Insert mode not supported 0x%x",imode); 333 } 334 } 335 } else { /* Block stash */ 336 PetscMPIInt count; 337 if (--frame[i].pendingb > 0) continue; 338 if (x->use_status) { 339 ierr = MPI_Get_count(&some_statuses[ii],intmsg ? MPIU_INT : MPIU_SCALAR,&count);CHKERRQ(ierr); 340 if (!intmsg) count /= bs; /* Convert from number of scalars to number of blocks */ 341 } else count = x->recvhdr[i].bcount; 342 for (j=0,recvint=frame[i].intb,recvscalar=frame[i].scalarb; j<count; j++,recvint++) { 343 PetscInt loc = (*recvint)*bs - X->map->rstart; 344 switch (imode) { 345 case ADD_VALUES: 346 for (k=loc; k<loc+bs; k++) xarray[k] += *recvscalar++; 347 break; 348 case INSERT_VALUES: 349 for (k=loc; k<loc+bs; k++) xarray[k] = *recvscalar++; 350 break; 351 default: SETERRQ1(PETSC_COMM_SELF,PETSC_ERR_SUP,"Insert mode not supported 0x%x",imode); 352 } 353 } 354 } 355 } 356 } 357 ierr = VecRestoreArray(X,&xarray);CHKERRQ(ierr); 358 ierr = MPI_Waitall(4*x->nsendranks,x->sendreqs,MPI_STATUSES_IGNORE);CHKERRQ(ierr); 359 ierr = PetscFree2(some_indices,some_statuses);CHKERRQ(ierr); 360 if (x->assembly_subset) { 361 void *dummy; /* reset segbuffers */ 362 ierr = PetscSegBufferExtractInPlace(x->segrecvint,&dummy);CHKERRQ(ierr); 363 ierr = PetscSegBufferExtractInPlace(x->segrecvscalar,&dummy);CHKERRQ(ierr); 364 } else { 365 ierr = VecAssemblyReset_MPI(X);CHKERRQ(ierr); 366 } 367 368 X->stash.insertmode = NOT_SET_VALUES; 369 X->bstash.insertmode = NOT_SET_VALUES; 370 ierr = VecStashScatterEnd_Private(&X->stash);CHKERRQ(ierr); 371 ierr = VecStashScatterEnd_Private(&X->bstash);CHKERRQ(ierr); 372 PetscFunctionReturn(0); 373 } 374 375 PetscErrorCode VecAssemblyReset_MPI(Vec X) 376 { 377 Vec_MPI *x = (Vec_MPI*)X->data; 378 PetscErrorCode ierr; 379 380 PetscFunctionBegin; 381 ierr = PetscFree(x->sendreqs);CHKERRQ(ierr); 382 ierr = PetscFree(x->recvreqs);CHKERRQ(ierr); 383 ierr = PetscFree(x->sendranks);CHKERRQ(ierr); 384 ierr = PetscFree(x->recvranks);CHKERRQ(ierr); 385 ierr = PetscFree(x->sendhdr);CHKERRQ(ierr); 386 ierr = PetscFree(x->recvhdr);CHKERRQ(ierr); 387 ierr = PetscFree(x->sendptrs);CHKERRQ(ierr); 388 ierr = PetscSegBufferDestroy(&x->segrecvint);CHKERRQ(ierr); 389 ierr = PetscSegBufferDestroy(&x->segrecvscalar);CHKERRQ(ierr); 390 ierr = PetscSegBufferDestroy(&x->segrecvframe);CHKERRQ(ierr); 391 PetscFunctionReturn(0); 392 } 393 394 395 static PetscErrorCode VecSetFromOptions_MPI(PetscOptionItems *PetscOptionsObject,Vec X) 396 { 397 #if !defined(PETSC_HAVE_MPIUNI) 398 PetscErrorCode ierr; 399 PetscBool flg = PETSC_FALSE,set; 400 401 PetscFunctionBegin; 402 ierr = PetscOptionsHead(PetscOptionsObject,"VecMPI Options");CHKERRQ(ierr); 403 ierr = PetscOptionsBool("-vec_assembly_legacy","Use MPI 1 version of assembly","",flg,&flg,&set);CHKERRQ(ierr); 404 if (set) { 405 X->ops->assemblybegin = flg ? VecAssemblyBegin_MPI : VecAssemblyBegin_MPI_BTS; 406 X->ops->assemblyend = flg ? VecAssemblyEnd_MPI : VecAssemblyEnd_MPI_BTS; 407 } 408 ierr = PetscOptionsTail();CHKERRQ(ierr); 409 #else 410 X->ops->assemblybegin = VecAssemblyBegin_MPI; 411 X->ops->assemblyend = VecAssemblyEnd_MPI; 412 #endif 413 PetscFunctionReturn(0); 414 } 415 416 417 static struct _VecOps DvOps = { VecDuplicate_MPI, /* 1 */ 418 VecDuplicateVecs_Default, 419 VecDestroyVecs_Default, 420 VecDot_MPI, 421 VecMDot_MPI, 422 VecNorm_MPI, 423 VecTDot_MPI, 424 VecMTDot_MPI, 425 VecScale_Seq, 426 VecCopy_Seq, /* 10 */ 427 VecSet_Seq, 428 VecSwap_Seq, 429 VecAXPY_Seq, 430 VecAXPBY_Seq, 431 VecMAXPY_Seq, 432 VecAYPX_Seq, 433 VecWAXPY_Seq, 434 VecAXPBYPCZ_Seq, 435 VecPointwiseMult_Seq, 436 VecPointwiseDivide_Seq, 437 VecSetValues_MPI, /* 20 */ 438 VecAssemblyBegin_MPI_BTS, 439 VecAssemblyEnd_MPI_BTS, 440 0, 441 VecGetSize_MPI, 442 VecGetSize_Seq, 443 0, 444 VecMax_MPI, 445 VecMin_MPI, 446 VecSetRandom_Seq, 447 VecSetOption_MPI, 448 VecSetValuesBlocked_MPI, 449 VecDestroy_MPI, 450 VecView_MPI, 451 VecPlaceArray_MPI, 452 VecReplaceArray_Seq, 453 VecDot_Seq, 454 VecTDot_Seq, 455 VecNorm_Seq, 456 VecMDot_Seq, 457 VecMTDot_Seq, 458 VecLoad_Default, 459 VecReciprocal_Default, 460 VecConjugate_Seq, 461 0, 462 0, 463 VecResetArray_MPI, 464 VecSetFromOptions_MPI,/*set from options */ 465 VecMaxPointwiseDivide_Seq, 466 VecPointwiseMax_Seq, 467 VecPointwiseMaxAbs_Seq, 468 VecPointwiseMin_Seq, 469 VecGetValues_MPI, 470 0, 471 0, 472 0, 473 0, 474 0, 475 0, 476 VecStrideGather_Default, 477 VecStrideScatter_Default, 478 0, 479 0, 480 0, 481 0, 482 0, 483 VecStrideSubSetGather_Default, 484 VecStrideSubSetScatter_Default, 485 0, 486 0 487 }; 488 489 /* 490 VecCreate_MPI_Private - Basic create routine called by VecCreate_MPI() (i.e. VecCreateMPI()), 491 VecCreateMPIWithArray(), VecCreate_Shared() (i.e. VecCreateShared()), VecCreateGhost(), 492 VecDuplicate_MPI(), VecCreateGhostWithArray(), VecDuplicate_MPI(), and VecDuplicate_Shared() 493 494 If alloc is true and array is NULL then this routine allocates the space, otherwise 495 no space is allocated. 496 */ 497 PetscErrorCode VecCreate_MPI_Private(Vec v,PetscBool alloc,PetscInt nghost,const PetscScalar array[]) 498 { 499 Vec_MPI *s; 500 PetscErrorCode ierr; 501 502 PetscFunctionBegin; 503 ierr = PetscNewLog(v,&s);CHKERRQ(ierr); 504 v->data = (void*)s; 505 ierr = PetscMemcpy(v->ops,&DvOps,sizeof(DvOps));CHKERRQ(ierr); 506 s->nghost = nghost; 507 v->petscnative = PETSC_TRUE; 508 509 ierr = PetscLayoutSetUp(v->map);CHKERRQ(ierr); 510 511 s->array = (PetscScalar*)array; 512 s->array_allocated = 0; 513 if (alloc && !array) { 514 PetscInt n = v->map->n+nghost; 515 ierr = PetscCalloc1(n,&s->array);CHKERRQ(ierr); 516 ierr = PetscLogObjectMemory((PetscObject)v,n*sizeof(PetscScalar));CHKERRQ(ierr); 517 s->array_allocated = s->array; 518 } 519 520 /* By default parallel vectors do not have local representation */ 521 s->localrep = 0; 522 s->localupdate = 0; 523 524 v->stash.insertmode = NOT_SET_VALUES; 525 v->bstash.insertmode = NOT_SET_VALUES; 526 /* create the stashes. The block-size for bstash is set later when 527 VecSetValuesBlocked is called. 528 */ 529 ierr = VecStashCreate_Private(PetscObjectComm((PetscObject)v),1,&v->stash);CHKERRQ(ierr); 530 ierr = VecStashCreate_Private(PetscObjectComm((PetscObject)v),PetscAbs(v->map->bs),&v->bstash);CHKERRQ(ierr); 531 532 #if defined(PETSC_HAVE_MATLAB_ENGINE) 533 ierr = PetscObjectComposeFunction((PetscObject)v,"PetscMatlabEnginePut_C",VecMatlabEnginePut_Default);CHKERRQ(ierr); 534 ierr = PetscObjectComposeFunction((PetscObject)v,"PetscMatlabEngineGet_C",VecMatlabEngineGet_Default);CHKERRQ(ierr); 535 #endif 536 ierr = PetscObjectChangeTypeName((PetscObject)v,VECMPI);CHKERRQ(ierr); 537 PetscFunctionReturn(0); 538 } 539 540 /*MC 541 VECMPI - VECMPI = "mpi" - The basic parallel vector 542 543 Options Database Keys: 544 . -vec_type mpi - sets the vector type to VECMPI during a call to VecSetFromOptions() 545 546 Level: beginner 547 548 .seealso: VecCreate(), VecSetType(), VecSetFromOptions(), VecCreateMPIWithArray(), VECMPI, VecType, VecCreateMPI(), VecCreateMPI() 549 M*/ 550 551 PETSC_EXTERN PetscErrorCode VecCreate_MPI(Vec vv) 552 { 553 PetscErrorCode ierr; 554 555 PetscFunctionBegin; 556 ierr = VecCreate_MPI_Private(vv,PETSC_TRUE,0,0);CHKERRQ(ierr); 557 PetscFunctionReturn(0); 558 } 559 560 /*MC 561 VECSTANDARD = "standard" - A VECSEQ on one process and VECMPI on more than one process 562 563 Options Database Keys: 564 . -vec_type standard - sets a vector type to standard on calls to VecSetFromOptions() 565 566 Level: beginner 567 568 .seealso: VecCreateSeq(), VecCreateMPI() 569 M*/ 570 571 PETSC_EXTERN PetscErrorCode VecCreate_Standard(Vec v) 572 { 573 PetscErrorCode ierr; 574 PetscMPIInt size; 575 576 PetscFunctionBegin; 577 ierr = MPI_Comm_size(PetscObjectComm((PetscObject)v),&size);CHKERRQ(ierr); 578 if (size == 1) { 579 ierr = VecSetType(v,VECSEQ);CHKERRQ(ierr); 580 } else { 581 ierr = VecSetType(v,VECMPI);CHKERRQ(ierr); 582 } 583 PetscFunctionReturn(0); 584 } 585 586 /*@C 587 VecCreateMPIWithArray - Creates a parallel, array-style vector, 588 where the user provides the array space to store the vector values. 589 590 Collective 591 592 Input Parameters: 593 + comm - the MPI communicator to use 594 . bs - block size, same meaning as VecSetBlockSize() 595 . n - local vector length, cannot be PETSC_DECIDE 596 . N - global vector length (or PETSC_DECIDE to have calculated) 597 - array - the user provided array to store the vector values 598 599 Output Parameter: 600 . vv - the vector 601 602 Notes: 603 Use VecDuplicate() or VecDuplicateVecs() to form additional vectors of the 604 same type as an existing vector. 605 606 If the user-provided array is NULL, then VecPlaceArray() can be used 607 at a later stage to SET the array for storing the vector values. 608 609 PETSc does NOT free the array when the vector is destroyed via VecDestroy(). 610 The user should not free the array until the vector is destroyed. 611 612 Level: intermediate 613 614 .seealso: VecCreateSeqWithArray(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateGhost(), 615 VecCreateMPI(), VecCreateGhostWithArray(), VecPlaceArray() 616 617 @*/ 618 PetscErrorCode VecCreateMPIWithArray(MPI_Comm comm,PetscInt bs,PetscInt n,PetscInt N,const PetscScalar array[],Vec *vv) 619 { 620 PetscErrorCode ierr; 621 622 PetscFunctionBegin; 623 if (n == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local size of vector"); 624 ierr = PetscSplitOwnership(comm,&n,&N);CHKERRQ(ierr); 625 ierr = VecCreate(comm,vv);CHKERRQ(ierr); 626 ierr = VecSetSizes(*vv,n,N);CHKERRQ(ierr); 627 ierr = VecSetBlockSize(*vv,bs);CHKERRQ(ierr); 628 ierr = VecCreate_MPI_Private(*vv,PETSC_FALSE,0,array);CHKERRQ(ierr); 629 PetscFunctionReturn(0); 630 } 631 632 /*@C 633 VecCreateGhostWithArray - Creates a parallel vector with ghost padding on each processor; 634 the caller allocates the array space. 635 636 Collective 637 638 Input Parameters: 639 + comm - the MPI communicator to use 640 . n - local vector length 641 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 642 . nghost - number of local ghost points 643 . ghosts - global indices of ghost points (or NULL if not needed), these do not need to be in increasing order (sorted) 644 - array - the space to store the vector values (as long as n + nghost) 645 646 Output Parameter: 647 . vv - the global vector representation (without ghost points as part of vector) 648 649 Notes: 650 Use VecGhostGetLocalForm() to access the local, ghosted representation 651 of the vector. 652 653 This also automatically sets the ISLocalToGlobalMapping() for this vector. 654 655 Level: advanced 656 657 658 .seealso: VecCreate(), VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), 659 VecCreateGhost(), VecCreateSeqWithArray(), VecCreateMPIWithArray(), 660 VecCreateGhostBlock(), VecCreateGhostBlockWithArray(), VecMPISetGhost() 661 662 @*/ 663 PetscErrorCode VecCreateGhostWithArray(MPI_Comm comm,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],const PetscScalar array[],Vec *vv) 664 { 665 PetscErrorCode ierr; 666 Vec_MPI *w; 667 PetscScalar *larray; 668 IS from,to; 669 ISLocalToGlobalMapping ltog; 670 PetscInt rstart,i,*indices; 671 672 PetscFunctionBegin; 673 *vv = 0; 674 675 if (n == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local size"); 676 if (nghost == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local ghost size"); 677 if (nghost < 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Ghost length must be >= 0"); 678 ierr = PetscSplitOwnership(comm,&n,&N);CHKERRQ(ierr); 679 /* Create global representation */ 680 ierr = VecCreate(comm,vv);CHKERRQ(ierr); 681 ierr = VecSetSizes(*vv,n,N);CHKERRQ(ierr); 682 ierr = VecCreate_MPI_Private(*vv,PETSC_TRUE,nghost,array);CHKERRQ(ierr); 683 w = (Vec_MPI*)(*vv)->data; 684 /* Create local representation */ 685 ierr = VecGetArray(*vv,&larray);CHKERRQ(ierr); 686 ierr = VecCreateSeqWithArray(PETSC_COMM_SELF,1,n+nghost,larray,&w->localrep);CHKERRQ(ierr); 687 ierr = PetscLogObjectParent((PetscObject)*vv,(PetscObject)w->localrep);CHKERRQ(ierr); 688 ierr = VecRestoreArray(*vv,&larray);CHKERRQ(ierr); 689 690 /* 691 Create scatter context for scattering (updating) ghost values 692 */ 693 ierr = ISCreateGeneral(comm,nghost,ghosts,PETSC_COPY_VALUES,&from);CHKERRQ(ierr); 694 ierr = ISCreateStride(PETSC_COMM_SELF,nghost,n,1,&to);CHKERRQ(ierr); 695 ierr = VecScatterCreate(*vv,from,w->localrep,to,&w->localupdate);CHKERRQ(ierr); 696 ierr = PetscLogObjectParent((PetscObject)*vv,(PetscObject)w->localupdate);CHKERRQ(ierr); 697 ierr = ISDestroy(&to);CHKERRQ(ierr); 698 ierr = ISDestroy(&from);CHKERRQ(ierr); 699 700 /* set local to global mapping for ghosted vector */ 701 ierr = PetscMalloc1(n+nghost,&indices);CHKERRQ(ierr); 702 ierr = VecGetOwnershipRange(*vv,&rstart,NULL);CHKERRQ(ierr); 703 for (i=0; i<n; i++) { 704 indices[i] = rstart + i; 705 } 706 for (i=0; i<nghost; i++) { 707 indices[n+i] = ghosts[i]; 708 } 709 ierr = ISLocalToGlobalMappingCreate(comm,1,n+nghost,indices,PETSC_OWN_POINTER,<og);CHKERRQ(ierr); 710 ierr = VecSetLocalToGlobalMapping(*vv,ltog);CHKERRQ(ierr); 711 ierr = ISLocalToGlobalMappingDestroy(<og);CHKERRQ(ierr); 712 PetscFunctionReturn(0); 713 } 714 715 /*@ 716 VecCreateGhost - Creates a parallel vector with ghost padding on each processor. 717 718 Collective 719 720 Input Parameters: 721 + comm - the MPI communicator to use 722 . n - local vector length 723 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 724 . nghost - number of local ghost points 725 - ghosts - global indices of ghost points, these do not need to be in increasing order (sorted) 726 727 Output Parameter: 728 . vv - the global vector representation (without ghost points as part of vector) 729 730 Notes: 731 Use VecGhostGetLocalForm() to access the local, ghosted representation 732 of the vector. 733 734 This also automatically sets the ISLocalToGlobalMapping() for this vector. 735 736 Level: advanced 737 738 .seealso: VecCreateSeq(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateMPI(), 739 VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), VecGhostUpdateBegin(), 740 VecCreateGhostWithArray(), VecCreateMPIWithArray(), VecGhostUpdateEnd(), 741 VecCreateGhostBlock(), VecCreateGhostBlockWithArray(), VecMPISetGhost() 742 743 @*/ 744 PetscErrorCode VecCreateGhost(MPI_Comm comm,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],Vec *vv) 745 { 746 PetscErrorCode ierr; 747 748 PetscFunctionBegin; 749 ierr = VecCreateGhostWithArray(comm,n,N,nghost,ghosts,0,vv);CHKERRQ(ierr); 750 PetscFunctionReturn(0); 751 } 752 753 /*@ 754 VecMPISetGhost - Sets the ghost points for an MPI ghost vector 755 756 Collective on Vec 757 758 Input Parameters: 759 + vv - the MPI vector 760 . nghost - number of local ghost points 761 - ghosts - global indices of ghost points, these do not need to be in increasing order (sorted) 762 763 764 Notes: 765 Use VecGhostGetLocalForm() to access the local, ghosted representation 766 of the vector. 767 768 This also automatically sets the ISLocalToGlobalMapping() for this vector. 769 770 You must call this AFTER you have set the type of the vector (with VecSetType()) and the size (with VecSetSizes()). 771 772 Level: advanced 773 774 .seealso: VecCreateSeq(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateMPI(), 775 VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), VecGhostUpdateBegin(), 776 VecCreateGhostWithArray(), VecCreateMPIWithArray(), VecGhostUpdateEnd(), 777 VecCreateGhostBlock(), VecCreateGhostBlockWithArray() 778 779 @*/ 780 PetscErrorCode VecMPISetGhost(Vec vv,PetscInt nghost,const PetscInt ghosts[]) 781 { 782 PetscErrorCode ierr; 783 PetscBool flg; 784 785 PetscFunctionBegin; 786 ierr = PetscObjectTypeCompare((PetscObject)vv,VECMPI,&flg);CHKERRQ(ierr); 787 /* if already fully existant VECMPI then basically destroy it and rebuild with ghosting */ 788 if (flg) { 789 PetscInt n,N; 790 Vec_MPI *w; 791 PetscScalar *larray; 792 IS from,to; 793 ISLocalToGlobalMapping ltog; 794 PetscInt rstart,i,*indices; 795 MPI_Comm comm; 796 797 ierr = PetscObjectGetComm((PetscObject)vv,&comm);CHKERRQ(ierr); 798 n = vv->map->n; 799 N = vv->map->N; 800 ierr = (*vv->ops->destroy)(vv);CHKERRQ(ierr); 801 ierr = VecSetSizes(vv,n,N);CHKERRQ(ierr); 802 ierr = VecCreate_MPI_Private(vv,PETSC_TRUE,nghost,NULL);CHKERRQ(ierr); 803 w = (Vec_MPI*)(vv)->data; 804 /* Create local representation */ 805 ierr = VecGetArray(vv,&larray);CHKERRQ(ierr); 806 ierr = VecCreateSeqWithArray(PETSC_COMM_SELF,1,n+nghost,larray,&w->localrep);CHKERRQ(ierr); 807 ierr = PetscLogObjectParent((PetscObject)vv,(PetscObject)w->localrep);CHKERRQ(ierr); 808 ierr = VecRestoreArray(vv,&larray);CHKERRQ(ierr); 809 810 /* 811 Create scatter context for scattering (updating) ghost values 812 */ 813 ierr = ISCreateGeneral(comm,nghost,ghosts,PETSC_COPY_VALUES,&from);CHKERRQ(ierr); 814 ierr = ISCreateStride(PETSC_COMM_SELF,nghost,n,1,&to);CHKERRQ(ierr); 815 ierr = VecScatterCreate(vv,from,w->localrep,to,&w->localupdate);CHKERRQ(ierr); 816 ierr = PetscLogObjectParent((PetscObject)vv,(PetscObject)w->localupdate);CHKERRQ(ierr); 817 ierr = ISDestroy(&to);CHKERRQ(ierr); 818 ierr = ISDestroy(&from);CHKERRQ(ierr); 819 820 /* set local to global mapping for ghosted vector */ 821 ierr = PetscMalloc1(n+nghost,&indices);CHKERRQ(ierr); 822 ierr = VecGetOwnershipRange(vv,&rstart,NULL);CHKERRQ(ierr); 823 824 for (i=0; i<n; i++) indices[i] = rstart + i; 825 for (i=0; i<nghost; i++) indices[n+i] = ghosts[i]; 826 827 ierr = ISLocalToGlobalMappingCreate(comm,1,n+nghost,indices,PETSC_OWN_POINTER,<og);CHKERRQ(ierr); 828 ierr = VecSetLocalToGlobalMapping(vv,ltog);CHKERRQ(ierr); 829 ierr = ISLocalToGlobalMappingDestroy(<og);CHKERRQ(ierr); 830 } else if (vv->ops->create == VecCreate_MPI) SETERRQ(PetscObjectComm((PetscObject)vv),PETSC_ERR_ARG_WRONGSTATE,"Must set local or global size before setting ghosting"); 831 else if (!((PetscObject)vv)->type_name) SETERRQ(PetscObjectComm((PetscObject)vv),PETSC_ERR_ARG_WRONGSTATE,"Must set type to VECMPI before ghosting"); 832 PetscFunctionReturn(0); 833 } 834 835 836 /* ------------------------------------------------------------------------------------------*/ 837 /*@C 838 VecCreateGhostBlockWithArray - Creates a parallel vector with ghost padding on each processor; 839 the caller allocates the array space. Indices in the ghost region are based on blocks. 840 841 Collective 842 843 Input Parameters: 844 + comm - the MPI communicator to use 845 . bs - block size 846 . n - local vector length 847 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 848 . nghost - number of local ghost blocks 849 . 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) 850 - array - the space to store the vector values (as long as n + nghost*bs) 851 852 Output Parameter: 853 . vv - the global vector representation (without ghost points as part of vector) 854 855 Notes: 856 Use VecGhostGetLocalForm() to access the local, ghosted representation 857 of the vector. 858 859 n is the local vector size (total local size not the number of blocks) while nghost 860 is the number of blocks in the ghost portion, i.e. the number of elements in the ghost 861 portion is bs*nghost 862 863 Level: advanced 864 865 866 .seealso: VecCreate(), VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), 867 VecCreateGhost(), VecCreateSeqWithArray(), VecCreateMPIWithArray(), 868 VecCreateGhostWithArray(), VecCreateGhostBlock() 869 870 @*/ 871 PetscErrorCode VecCreateGhostBlockWithArray(MPI_Comm comm,PetscInt bs,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],const PetscScalar array[],Vec *vv) 872 { 873 PetscErrorCode ierr; 874 Vec_MPI *w; 875 PetscScalar *larray; 876 IS from,to; 877 ISLocalToGlobalMapping ltog; 878 PetscInt rstart,i,nb,*indices; 879 880 PetscFunctionBegin; 881 *vv = 0; 882 883 if (n == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local size"); 884 if (nghost == PETSC_DECIDE) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Must set local ghost size"); 885 if (nghost < 0) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_OUTOFRANGE,"Ghost length must be >= 0"); 886 if (n % bs) SETERRQ(PETSC_COMM_SELF,PETSC_ERR_ARG_INCOMP,"Local size must be a multiple of block size"); 887 ierr = PetscSplitOwnership(comm,&n,&N);CHKERRQ(ierr); 888 /* Create global representation */ 889 ierr = VecCreate(comm,vv);CHKERRQ(ierr); 890 ierr = VecSetSizes(*vv,n,N);CHKERRQ(ierr); 891 ierr = VecSetBlockSize(*vv,bs);CHKERRQ(ierr); 892 ierr = VecCreate_MPI_Private(*vv,PETSC_TRUE,nghost*bs,array);CHKERRQ(ierr); 893 w = (Vec_MPI*)(*vv)->data; 894 /* Create local representation */ 895 ierr = VecGetArray(*vv,&larray);CHKERRQ(ierr); 896 ierr = VecCreateSeqWithArray(PETSC_COMM_SELF,bs,n+bs*nghost,larray,&w->localrep);CHKERRQ(ierr); 897 ierr = PetscLogObjectParent((PetscObject)*vv,(PetscObject)w->localrep);CHKERRQ(ierr); 898 ierr = VecRestoreArray(*vv,&larray);CHKERRQ(ierr); 899 900 /* 901 Create scatter context for scattering (updating) ghost values 902 */ 903 ierr = ISCreateBlock(comm,bs,nghost,ghosts,PETSC_COPY_VALUES,&from);CHKERRQ(ierr); 904 ierr = ISCreateStride(PETSC_COMM_SELF,bs*nghost,n,1,&to);CHKERRQ(ierr); 905 ierr = VecScatterCreate(*vv,from,w->localrep,to,&w->localupdate);CHKERRQ(ierr); 906 ierr = PetscLogObjectParent((PetscObject)*vv,(PetscObject)w->localupdate);CHKERRQ(ierr); 907 ierr = ISDestroy(&to);CHKERRQ(ierr); 908 ierr = ISDestroy(&from);CHKERRQ(ierr); 909 910 /* set local to global mapping for ghosted vector */ 911 nb = n/bs; 912 ierr = PetscMalloc1(nb+nghost,&indices);CHKERRQ(ierr); 913 ierr = VecGetOwnershipRange(*vv,&rstart,NULL);CHKERRQ(ierr); 914 rstart = rstart/bs; 915 916 for (i=0; i<nb; i++) indices[i] = rstart + i; 917 for (i=0; i<nghost; i++) indices[nb+i] = ghosts[i]; 918 919 ierr = ISLocalToGlobalMappingCreate(comm,bs,nb+nghost,indices,PETSC_OWN_POINTER,<og);CHKERRQ(ierr); 920 ierr = VecSetLocalToGlobalMapping(*vv,ltog);CHKERRQ(ierr); 921 ierr = ISLocalToGlobalMappingDestroy(<og);CHKERRQ(ierr); 922 PetscFunctionReturn(0); 923 } 924 925 /*@ 926 VecCreateGhostBlock - Creates a parallel vector with ghost padding on each processor. 927 The indicing of the ghost points is done with blocks. 928 929 Collective 930 931 Input Parameters: 932 + comm - the MPI communicator to use 933 . bs - the block size 934 . n - local vector length 935 . N - global vector length (or PETSC_DECIDE to have calculated if n is given) 936 . nghost - number of local ghost blocks 937 - ghosts - global indices of ghost blocks, counts are by block, not by individual index, these do not need to be in increasing order (sorted) 938 939 Output Parameter: 940 . vv - the global vector representation (without ghost points as part of vector) 941 942 Notes: 943 Use VecGhostGetLocalForm() to access the local, ghosted representation 944 of the vector. 945 946 n is the local vector size (total local size not the number of blocks) while nghost 947 is the number of blocks in the ghost portion, i.e. the number of elements in the ghost 948 portion is bs*nghost 949 950 Level: advanced 951 952 .seealso: VecCreateSeq(), VecCreate(), VecDuplicate(), VecDuplicateVecs(), VecCreateMPI(), 953 VecGhostGetLocalForm(), VecGhostRestoreLocalForm(), 954 VecCreateGhostWithArray(), VecCreateMPIWithArray(), VecCreateGhostBlockWithArray() 955 956 @*/ 957 PetscErrorCode VecCreateGhostBlock(MPI_Comm comm,PetscInt bs,PetscInt n,PetscInt N,PetscInt nghost,const PetscInt ghosts[],Vec *vv) 958 { 959 PetscErrorCode ierr; 960 961 PetscFunctionBegin; 962 ierr = VecCreateGhostBlockWithArray(comm,bs,n,N,nghost,ghosts,0,vv);CHKERRQ(ierr); 963 PetscFunctionReturn(0); 964 } 965