Actual source code: mpidense.c

  1: #define PETSCMAT_DLL

  3: /*
  4:    Basic functions for basic parallel dense matrices.
  5: */
  6: 
 7:  #include src/mat/impls/dense/mpi/mpidense.h

 11: PetscErrorCode MatLUFactorSymbolic_MPIDense(Mat A,IS row,IS col,MatFactorInfo *info,Mat *fact)
 12: {

 16:   MatDuplicate(A,MAT_DO_NOT_COPY_VALUES,fact);
 17:   return(0);
 18: }

 22: PetscErrorCode MatCholeskyFactorSymbolic_MPIDense(Mat A,IS perm,MatFactorInfo *info,Mat *fact)
 23: {

 27:   MatDuplicate(A,MAT_DO_NOT_COPY_VALUES,fact);
 28:   return(0);
 29: }

 33: /*@

 35:       MatDenseGetLocalMatrix - For a MATMPIDENSE or MATSEQDENSE matrix returns the sequential
 36:               matrix that represents the operator. For sequential matrices it returns itself.

 38:     Input Parameter:
 39: .      A - the Seq or MPI dense matrix

 41:     Output Parameter:
 42: .      B - the inner matrix

 44:     Level: intermediate

 46: @*/
 47: PetscErrorCode MatDenseGetLocalMatrix(Mat A,Mat *B)
 48: {
 49:   Mat_MPIDense   *mat = (Mat_MPIDense*)A->data;
 51:   PetscTruth     flg;
 52:   PetscMPIInt    size;

 55:   PetscTypeCompare((PetscObject)A,MATMPIDENSE,&flg);
 56:   if (!flg) {  /* this check sucks! */
 57:     PetscTypeCompare((PetscObject)A,MATDENSE,&flg);
 58:     if (flg) {
 59:       MPI_Comm_size(A->comm,&size);
 60:       if (size == 1) flg = PETSC_FALSE;
 61:     }
 62:   }
 63:   if (flg) {
 64:     *B = mat->A;
 65:   } else {
 66:     *B = A;
 67:   }
 68:   return(0);
 69: }

 73: PetscErrorCode MatGetRow_MPIDense(Mat A,PetscInt row,PetscInt *nz,PetscInt **idx,PetscScalar **v)
 74: {
 75:   Mat_MPIDense   *mat = (Mat_MPIDense*)A->data;
 77:   PetscInt       lrow,rstart = A->rmap.rstart,rend = A->rmap.rend;

 80:   if (row < rstart || row >= rend) SETERRQ(PETSC_ERR_SUP,"only local rows")
 81:   lrow = row - rstart;
 82:   MatGetRow(mat->A,lrow,nz,(const PetscInt **)idx,(const PetscScalar **)v);
 83:   return(0);
 84: }

 88: PetscErrorCode MatRestoreRow_MPIDense(Mat mat,PetscInt row,PetscInt *nz,PetscInt **idx,PetscScalar **v)
 89: {

 93:   if (idx) {PetscFree(*idx);}
 94:   if (v) {PetscFree(*v);}
 95:   return(0);
 96: }

101: PetscErrorCode PETSCMAT_DLLEXPORT MatGetDiagonalBlock_MPIDense(Mat A,PetscTruth *iscopy,MatReuse reuse,Mat *B)
102: {
103:   Mat_MPIDense   *mdn = (Mat_MPIDense*)A->data;
105:   PetscInt       m = A->rmap.n,rstart = A->rmap.rstart;
106:   PetscScalar    *array;
107:   MPI_Comm       comm;

110:   if (A->rmap.N != A->cmap.N) SETERRQ(PETSC_ERR_SUP,"Only square matrices supported.");

112:   /* The reuse aspect is not implemented efficiently */
113:   if (reuse) { MatDestroy(*B);}

115:   PetscObjectGetComm((PetscObject)(mdn->A),&comm);
116:   MatGetArray(mdn->A,&array);
117:   MatCreate(comm,B);
118:   MatSetSizes(*B,m,m,m,m);
119:   MatSetType(*B,mdn->A->type_name);
120:   MatSeqDenseSetPreallocation(*B,array+m*rstart);
121:   MatRestoreArray(mdn->A,&array);
122:   MatAssemblyBegin(*B,MAT_FINAL_ASSEMBLY);
123:   MatAssemblyEnd(*B,MAT_FINAL_ASSEMBLY);
124: 
125:   *iscopy = PETSC_TRUE;
126:   return(0);
127: }

132: PetscErrorCode MatSetValues_MPIDense(Mat mat,PetscInt m,const PetscInt idxm[],PetscInt n,const PetscInt idxn[],const PetscScalar v[],InsertMode addv)
133: {
134:   Mat_MPIDense   *A = (Mat_MPIDense*)mat->data;
136:   PetscInt       i,j,rstart = mat->rmap.rstart,rend = mat->rmap.rend,row;
137:   PetscTruth     roworiented = A->roworiented;

140:   for (i=0; i<m; i++) {
141:     if (idxm[i] < 0) continue;
142:     if (idxm[i] >= mat->rmap.N) SETERRQ(PETSC_ERR_ARG_OUTOFRANGE,"Row too large");
143:     if (idxm[i] >= rstart && idxm[i] < rend) {
144:       row = idxm[i] - rstart;
145:       if (roworiented) {
146:         MatSetValues(A->A,1,&row,n,idxn,v+i*n,addv);
147:       } else {
148:         for (j=0; j<n; j++) {
149:           if (idxn[j] < 0) continue;
150:           if (idxn[j] >= mat->cmap.N) SETERRQ(PETSC_ERR_ARG_OUTOFRANGE,"Column too large");
151:           MatSetValues(A->A,1,&row,1,&idxn[j],v+i+j*m,addv);
152:         }
153:       }
154:     } else {
155:       if (!A->donotstash) {
156:         if (roworiented) {
157:           MatStashValuesRow_Private(&mat->stash,idxm[i],n,idxn,v+i*n);
158:         } else {
159:           MatStashValuesCol_Private(&mat->stash,idxm[i],n,idxn,v+i,m);
160:         }
161:       }
162:     }
163:   }
164:   return(0);
165: }

169: PetscErrorCode MatGetValues_MPIDense(Mat mat,PetscInt m,const PetscInt idxm[],PetscInt n,const PetscInt idxn[],PetscScalar v[])
170: {
171:   Mat_MPIDense   *mdn = (Mat_MPIDense*)mat->data;
173:   PetscInt       i,j,rstart = mat->rmap.rstart,rend = mat->rmap.rend,row;

176:   for (i=0; i<m; i++) {
177:     if (idxm[i] < 0) SETERRQ(PETSC_ERR_ARG_OUTOFRANGE,"Negative row");
178:     if (idxm[i] >= mat->rmap.N) SETERRQ(PETSC_ERR_ARG_OUTOFRANGE,"Row too large");
179:     if (idxm[i] >= rstart && idxm[i] < rend) {
180:       row = idxm[i] - rstart;
181:       for (j=0; j<n; j++) {
182:         if (idxn[j] < 0) SETERRQ(PETSC_ERR_ARG_OUTOFRANGE,"Negative column");
183:         if (idxn[j] >= mat->cmap.N) {
184:           SETERRQ(PETSC_ERR_ARG_OUTOFRANGE,"Column too large");
185:         }
186:         MatGetValues(mdn->A,1,&row,1,&idxn[j],v+i*n+j);
187:       }
188:     } else {
189:       SETERRQ(PETSC_ERR_SUP,"Only local values currently supported");
190:     }
191:   }
192:   return(0);
193: }

197: PetscErrorCode MatGetArray_MPIDense(Mat A,PetscScalar *array[])
198: {
199:   Mat_MPIDense   *a = (Mat_MPIDense*)A->data;

203:   MatGetArray(a->A,array);
204:   return(0);
205: }

209: static PetscErrorCode MatGetSubMatrix_MPIDense(Mat A,IS isrow,IS iscol,PetscInt cs,MatReuse scall,Mat *B)
210: {
211:   Mat_MPIDense   *mat = (Mat_MPIDense*)A->data,*newmatd;
212:   Mat_SeqDense   *lmat = (Mat_SeqDense*)mat->A->data;
214:   PetscInt       i,j,*irow,*icol,rstart,rend,nrows,ncols,nlrows,nlcols;
215:   PetscScalar    *av,*bv,*v = lmat->v;
216:   Mat            newmat;

219:   ISGetIndices(isrow,&irow);
220:   ISGetIndices(iscol,&icol);
221:   ISGetLocalSize(isrow,&nrows);
222:   ISGetLocalSize(iscol,&ncols);

224:   /* No parallel redistribution currently supported! Should really check each index set
225:      to comfirm that it is OK.  ... Currently supports only submatrix same partitioning as
226:      original matrix! */

228:   MatGetLocalSize(A,&nlrows,&nlcols);
229:   MatGetOwnershipRange(A,&rstart,&rend);
230: 
231:   /* Check submatrix call */
232:   if (scall == MAT_REUSE_MATRIX) {
233:     /* SETERRQ(PETSC_ERR_ARG_SIZ,"Reused submatrix wrong size"); */
234:     /* Really need to test rows and column sizes! */
235:     newmat = *B;
236:   } else {
237:     /* Create and fill new matrix */
238:     MatCreate(A->comm,&newmat);
239:     MatSetSizes(newmat,nrows,cs,PETSC_DECIDE,ncols);
240:     MatSetType(newmat,A->type_name);
241:     MatMPIDenseSetPreallocation(newmat,PETSC_NULL);
242:   }

244:   /* Now extract the data pointers and do the copy, column at a time */
245:   newmatd = (Mat_MPIDense*)newmat->data;
246:   bv      = ((Mat_SeqDense *)newmatd->A->data)->v;
247: 
248:   for (i=0; i<ncols; i++) {
249:     av = v + nlrows*icol[i];
250:     for (j=0; j<nrows; j++) {
251:       *bv++ = av[irow[j] - rstart];
252:     }
253:   }

255:   /* Assemble the matrices so that the correct flags are set */
256:   MatAssemblyBegin(newmat,MAT_FINAL_ASSEMBLY);
257:   MatAssemblyEnd(newmat,MAT_FINAL_ASSEMBLY);

259:   /* Free work space */
260:   ISRestoreIndices(isrow,&irow);
261:   ISRestoreIndices(iscol,&icol);
262:   *B = newmat;
263:   return(0);
264: }

268: PetscErrorCode MatRestoreArray_MPIDense(Mat A,PetscScalar *array[])
269: {
271:   return(0);
272: }

276: PetscErrorCode MatAssemblyBegin_MPIDense(Mat mat,MatAssemblyType mode)
277: {
278:   Mat_MPIDense   *mdn = (Mat_MPIDense*)mat->data;
279:   MPI_Comm       comm = mat->comm;
281:   PetscInt       nstash,reallocs;
282:   InsertMode     addv;

285:   /* make sure all processors are either in INSERTMODE or ADDMODE */
286:   MPI_Allreduce(&mat->insertmode,&addv,1,MPI_INT,MPI_BOR,comm);
287:   if (addv == (ADD_VALUES|INSERT_VALUES)) {
288:     SETERRQ(PETSC_ERR_ARG_WRONGSTATE,"Cannot mix adds/inserts on different procs");
289:   }
290:   mat->insertmode = addv; /* in case this processor had no cache */

292:   MatStashScatterBegin_Private(&mat->stash,mat->rmap.range);
293:   MatStashGetInfo_Private(&mat->stash,&nstash,&reallocs);
294:   PetscInfo2(mdn->A,"Stash has %D entries, uses %D mallocs.\n",nstash,reallocs);
295:   return(0);
296: }

300: PetscErrorCode MatAssemblyEnd_MPIDense(Mat mat,MatAssemblyType mode)
301: {
302:   Mat_MPIDense    *mdn=(Mat_MPIDense*)mat->data;
303:   PetscErrorCode  ierr;
304:   PetscInt        i,*row,*col,flg,j,rstart,ncols;
305:   PetscMPIInt     n;
306:   PetscScalar     *val;
307:   InsertMode      addv=mat->insertmode;

310:   /*  wait on receives */
311:   while (1) {
312:     MatStashScatterGetMesg_Private(&mat->stash,&n,&row,&col,&val,&flg);
313:     if (!flg) break;
314: 
315:     for (i=0; i<n;) {
316:       /* Now identify the consecutive vals belonging to the same row */
317:       for (j=i,rstart=row[j]; j<n; j++) { if (row[j] != rstart) break; }
318:       if (j < n) ncols = j-i;
319:       else       ncols = n-i;
320:       /* Now assemble all these values with a single function call */
321:       MatSetValues_MPIDense(mat,1,row+i,ncols,col+i,val+i,addv);
322:       i = j;
323:     }
324:   }
325:   MatStashScatterEnd_Private(&mat->stash);
326: 
327:   MatAssemblyBegin(mdn->A,mode);
328:   MatAssemblyEnd(mdn->A,mode);

330:   if (!mat->was_assembled && mode == MAT_FINAL_ASSEMBLY) {
331:     MatSetUpMultiply_MPIDense(mat);
332:   }
333:   return(0);
334: }

338: PetscErrorCode MatZeroEntries_MPIDense(Mat A)
339: {
341:   Mat_MPIDense   *l = (Mat_MPIDense*)A->data;

344:   MatZeroEntries(l->A);
345:   return(0);
346: }

348: /* the code does not do the diagonal entries correctly unless the 
349:    matrix is square and the column and row owerships are identical.
350:    This is a BUG. The only way to fix it seems to be to access 
351:    mdn->A and mdn->B directly and not through the MatZeroRows() 
352:    routine. 
353: */
356: PetscErrorCode MatZeroRows_MPIDense(Mat A,PetscInt N,const PetscInt rows[],PetscScalar diag)
357: {
358:   Mat_MPIDense   *l = (Mat_MPIDense*)A->data;
360:   PetscInt       i,*owners = A->rmap.range;
361:   PetscInt       *nprocs,j,idx,nsends;
362:   PetscInt       nmax,*svalues,*starts,*owner,nrecvs;
363:   PetscInt       *rvalues,tag = A->tag,count,base,slen,*source;
364:   PetscInt       *lens,*lrows,*values;
365:   PetscMPIInt    n,imdex,rank = l->rank,size = l->size;
366:   MPI_Comm       comm = A->comm;
367:   MPI_Request    *send_waits,*recv_waits;
368:   MPI_Status     recv_status,*send_status;
369:   PetscTruth     found;

372:   /*  first count number of contributors to each processor */
373:   PetscMalloc(2*size*sizeof(PetscInt),&nprocs);
374:   PetscMemzero(nprocs,2*size*sizeof(PetscInt));
375:   PetscMalloc((N+1)*sizeof(PetscInt),&owner); /* see note*/
376:   for (i=0; i<N; i++) {
377:     idx = rows[i];
378:     found = PETSC_FALSE;
379:     for (j=0; j<size; j++) {
380:       if (idx >= owners[j] && idx < owners[j+1]) {
381:         nprocs[2*j]++; nprocs[2*j+1] = 1; owner[i] = j; found = PETSC_TRUE; break;
382:       }
383:     }
384:     if (!found) SETERRQ(PETSC_ERR_ARG_OUTOFRANGE,"Index out of range");
385:   }
386:   nsends = 0;  for (i=0; i<size; i++) { nsends += nprocs[2*i+1];}

388:   /* inform other processors of number of messages and max length*/
389:   PetscMaxSum(comm,nprocs,&nmax,&nrecvs);

391:   /* post receives:   */
392:   PetscMalloc((nrecvs+1)*(nmax+1)*sizeof(PetscInt),&rvalues);
393:   PetscMalloc((nrecvs+1)*sizeof(MPI_Request),&recv_waits);
394:   for (i=0; i<nrecvs; i++) {
395:     MPI_Irecv(rvalues+nmax*i,nmax,MPIU_INT,MPI_ANY_SOURCE,tag,comm,recv_waits+i);
396:   }

398:   /* do sends:
399:       1) starts[i] gives the starting index in svalues for stuff going to 
400:          the ith processor
401:   */
402:   PetscMalloc((N+1)*sizeof(PetscInt),&svalues);
403:   PetscMalloc((nsends+1)*sizeof(MPI_Request),&send_waits);
404:   PetscMalloc((size+1)*sizeof(PetscInt),&starts);
405:   starts[0]  = 0;
406:   for (i=1; i<size; i++) { starts[i] = starts[i-1] + nprocs[2*i-2];}
407:   for (i=0; i<N; i++) {
408:     svalues[starts[owner[i]]++] = rows[i];
409:   }

411:   starts[0] = 0;
412:   for (i=1; i<size+1; i++) { starts[i] = starts[i-1] + nprocs[2*i-2];}
413:   count = 0;
414:   for (i=0; i<size; i++) {
415:     if (nprocs[2*i+1]) {
416:       MPI_Isend(svalues+starts[i],nprocs[2*i],MPIU_INT,i,tag,comm,send_waits+count++);
417:     }
418:   }
419:   PetscFree(starts);

421:   base = owners[rank];

423:   /*  wait on receives */
424:   PetscMalloc(2*(nrecvs+1)*sizeof(PetscInt),&lens);
425:   source = lens + nrecvs;
426:   count  = nrecvs; slen = 0;
427:   while (count) {
428:     MPI_Waitany(nrecvs,recv_waits,&imdex,&recv_status);
429:     /* unpack receives into our local space */
430:     MPI_Get_count(&recv_status,MPIU_INT,&n);
431:     source[imdex]  = recv_status.MPI_SOURCE;
432:     lens[imdex]    = n;
433:     slen += n;
434:     count--;
435:   }
436:   PetscFree(recv_waits);
437: 
438:   /* move the data into the send scatter */
439:   PetscMalloc((slen+1)*sizeof(PetscInt),&lrows);
440:   count = 0;
441:   for (i=0; i<nrecvs; i++) {
442:     values = rvalues + i*nmax;
443:     for (j=0; j<lens[i]; j++) {
444:       lrows[count++] = values[j] - base;
445:     }
446:   }
447:   PetscFree(rvalues);
448:   PetscFree(lens);
449:   PetscFree(owner);
450:   PetscFree(nprocs);
451: 
452:   /* actually zap the local rows */
453:   MatZeroRows(l->A,slen,lrows,diag);
454:   PetscFree(lrows);

456:   /* wait on sends */
457:   if (nsends) {
458:     PetscMalloc(nsends*sizeof(MPI_Status),&send_status);
459:     MPI_Waitall(nsends,send_waits,send_status);
460:     PetscFree(send_status);
461:   }
462:   PetscFree(send_waits);
463:   PetscFree(svalues);

465:   return(0);
466: }

470: PetscErrorCode MatMult_MPIDense(Mat mat,Vec xx,Vec yy)
471: {
472:   Mat_MPIDense   *mdn = (Mat_MPIDense*)mat->data;

476:   VecScatterBegin(xx,mdn->lvec,INSERT_VALUES,SCATTER_FORWARD,mdn->Mvctx);
477:   VecScatterEnd(xx,mdn->lvec,INSERT_VALUES,SCATTER_FORWARD,mdn->Mvctx);
478:   MatMult_SeqDense(mdn->A,mdn->lvec,yy);
479:   return(0);
480: }

484: PetscErrorCode MatMultAdd_MPIDense(Mat mat,Vec xx,Vec yy,Vec zz)
485: {
486:   Mat_MPIDense   *mdn = (Mat_MPIDense*)mat->data;

490:   VecScatterBegin(xx,mdn->lvec,INSERT_VALUES,SCATTER_FORWARD,mdn->Mvctx);
491:   VecScatterEnd(xx,mdn->lvec,INSERT_VALUES,SCATTER_FORWARD,mdn->Mvctx);
492:   MatMultAdd_SeqDense(mdn->A,mdn->lvec,yy,zz);
493:   return(0);
494: }

498: PetscErrorCode MatMultTranspose_MPIDense(Mat A,Vec xx,Vec yy)
499: {
500:   Mat_MPIDense   *a = (Mat_MPIDense*)A->data;
502:   PetscScalar    zero = 0.0;

505:   VecSet(yy,zero);
506:   MatMultTranspose_SeqDense(a->A,xx,a->lvec);
507:   VecScatterBegin(a->lvec,yy,ADD_VALUES,SCATTER_REVERSE,a->Mvctx);
508:   VecScatterEnd(a->lvec,yy,ADD_VALUES,SCATTER_REVERSE,a->Mvctx);
509:   return(0);
510: }

514: PetscErrorCode MatMultTransposeAdd_MPIDense(Mat A,Vec xx,Vec yy,Vec zz)
515: {
516:   Mat_MPIDense   *a = (Mat_MPIDense*)A->data;

520:   VecCopy(yy,zz);
521:   MatMultTranspose_SeqDense(a->A,xx,a->lvec);
522:   VecScatterBegin(a->lvec,zz,ADD_VALUES,SCATTER_REVERSE,a->Mvctx);
523:   VecScatterEnd(a->lvec,zz,ADD_VALUES,SCATTER_REVERSE,a->Mvctx);
524:   return(0);
525: }

529: PetscErrorCode MatGetDiagonal_MPIDense(Mat A,Vec v)
530: {
531:   Mat_MPIDense   *a = (Mat_MPIDense*)A->data;
532:   Mat_SeqDense   *aloc = (Mat_SeqDense*)a->A->data;
534:   PetscInt       len,i,n,m = A->rmap.n,radd;
535:   PetscScalar    *x,zero = 0.0;
536: 
538:   VecSet(v,zero);
539:   VecGetArray(v,&x);
540:   VecGetSize(v,&n);
541:   if (n != A->rmap.N) SETERRQ(PETSC_ERR_ARG_SIZ,"Nonconforming mat and vec");
542:   len  = PetscMin(a->A->rmap.n,a->A->cmap.n);
543:   radd = A->rmap.rstart*m;
544:   for (i=0; i<len; i++) {
545:     x[i] = aloc->v[radd + i*m + i];
546:   }
547:   VecRestoreArray(v,&x);
548:   return(0);
549: }

553: PetscErrorCode MatDestroy_MPIDense(Mat mat)
554: {
555:   Mat_MPIDense   *mdn = (Mat_MPIDense*)mat->data;


560: #if defined(PETSC_USE_LOG)
561:   PetscLogObjectState((PetscObject)mat,"Rows=%D, Cols=%D",mat->rmap.N,mat->cmap.N);
562: #endif
563:   MatStashDestroy_Private(&mat->stash);
564:   MatDestroy(mdn->A);
565:   if (mdn->lvec)   {VecDestroy(mdn->lvec);}
566:   if (mdn->Mvctx)  {VecScatterDestroy(mdn->Mvctx);}
567:   if (mdn->factor) {
568:     PetscFree(mdn->factor->temp);
569:     PetscFree(mdn->factor->tag);
570:     PetscFree(mdn->factor->pivots);
571:     PetscFree(mdn->factor);
572:   }
573:   PetscFree(mdn);
574:   PetscObjectComposeFunctionDynamic((PetscObject)mat,"MatGetDiagonalBlock_C","",PETSC_NULL);
575:   PetscObjectComposeFunctionDynamic((PetscObject)mat,"MatMPIDenseSetPreallocation_C","",PETSC_NULL);
576:   return(0);
577: }

581: static PetscErrorCode MatView_MPIDense_Binary(Mat mat,PetscViewer viewer)
582: {
583:   Mat_MPIDense   *mdn = (Mat_MPIDense*)mat->data;

587:   if (mdn->size == 1) {
588:     MatView(mdn->A,viewer);
589:   }
590:   else SETERRQ(PETSC_ERR_SUP,"Only uniprocessor output supported");
591:   return(0);
592: }

596: static PetscErrorCode MatView_MPIDense_ASCIIorDraworSocket(Mat mat,PetscViewer viewer)
597: {
598:   Mat_MPIDense      *mdn = (Mat_MPIDense*)mat->data;
599:   PetscErrorCode    ierr;
600:   PetscMPIInt       size = mdn->size,rank = mdn->rank;
601:   PetscViewerType   vtype;
602:   PetscTruth        iascii,isdraw;
603:   PetscViewer       sviewer;
604:   PetscViewerFormat format;

607:   PetscTypeCompare((PetscObject)viewer,PETSC_VIEWER_ASCII,&iascii);
608:   PetscTypeCompare((PetscObject)viewer,PETSC_VIEWER_DRAW,&isdraw);
609:   if (iascii) {
610:     PetscViewerGetType(viewer,&vtype);
611:     PetscViewerGetFormat(viewer,&format);
612:     if (format == PETSC_VIEWER_ASCII_INFO_DETAIL) {
613:       MatInfo info;
614:       MatGetInfo(mat,MAT_LOCAL,&info);
615:       PetscViewerASCIISynchronizedPrintf(viewer,"  [%d] local rows %D nz %D nz alloced %D mem %D \n",rank,mat->rmap.n,
616:                    (PetscInt)info.nz_used,(PetscInt)info.nz_allocated,(PetscInt)info.memory);
617:       PetscViewerFlush(viewer);
618:       VecScatterView(mdn->Mvctx,viewer);
619:       return(0);
620:     } else if (format == PETSC_VIEWER_ASCII_INFO) {
621:       return(0);
622:     }
623:   } else if (isdraw) {
624:     PetscDraw  draw;
625:     PetscTruth isnull;

627:     PetscViewerDrawGetDraw(viewer,0,&draw);
628:     PetscDrawIsNull(draw,&isnull);
629:     if (isnull) return(0);
630:   }

632:   if (size == 1) {
633:     MatView(mdn->A,viewer);
634:   } else {
635:     /* assemble the entire matrix onto first processor. */
636:     Mat         A;
637:     PetscInt    M = mat->rmap.N,N = mat->cmap.N,m,row,i,nz;
638:     PetscInt    *cols;
639:     PetscScalar *vals;

641:     MatCreate(mat->comm,&A);
642:     if (!rank) {
643:       MatSetSizes(A,M,N,M,N);
644:     } else {
645:       MatSetSizes(A,0,0,M,N);
646:     }
647:     /* Since this is a temporary matrix, MATMPIDENSE instead of A->type_name here is probably acceptable. */
648:     MatSetType(A,MATMPIDENSE);
649:     MatMPIDenseSetPreallocation(A,PETSC_NULL);
650:     PetscLogObjectParent(mat,A);

652:     /* Copy the matrix ... This isn't the most efficient means,
653:        but it's quick for now */
654:     A->insertmode = INSERT_VALUES;
655:     row = mat->rmap.rstart; m = mdn->A->rmap.n;
656:     for (i=0; i<m; i++) {
657:       MatGetRow_MPIDense(mat,row,&nz,&cols,&vals);
658:       MatSetValues_MPIDense(A,1,&row,nz,cols,vals,INSERT_VALUES);
659:       MatRestoreRow_MPIDense(mat,row,&nz,&cols,&vals);
660:       row++;
661:     }

663:     MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
664:     MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
665:     PetscViewerGetSingleton(viewer,&sviewer);
666:     if (!rank) {
667:       MatView(((Mat_MPIDense*)(A->data))->A,sviewer);
668:     }
669:     PetscViewerRestoreSingleton(viewer,&sviewer);
670:     PetscViewerFlush(viewer);
671:     MatDestroy(A);
672:   }
673:   return(0);
674: }

678: PetscErrorCode MatView_MPIDense(Mat mat,PetscViewer viewer)
679: {
681:   PetscTruth     iascii,isbinary,isdraw,issocket;
682: 
684: 
685:   PetscTypeCompare((PetscObject)viewer,PETSC_VIEWER_ASCII,&iascii);
686:   PetscTypeCompare((PetscObject)viewer,PETSC_VIEWER_BINARY,&isbinary);
687:   PetscTypeCompare((PetscObject)viewer,PETSC_VIEWER_SOCKET,&issocket);
688:   PetscTypeCompare((PetscObject)viewer,PETSC_VIEWER_DRAW,&isdraw);

690:   if (iascii || issocket || isdraw) {
691:     MatView_MPIDense_ASCIIorDraworSocket(mat,viewer);
692:   } else if (isbinary) {
693:     MatView_MPIDense_Binary(mat,viewer);
694:   } else {
695:     SETERRQ1(PETSC_ERR_SUP,"Viewer type %s not supported by MPI dense matrix",((PetscObject)viewer)->type_name);
696:   }
697:   return(0);
698: }

702: PetscErrorCode MatGetInfo_MPIDense(Mat A,MatInfoType flag,MatInfo *info)
703: {
704:   Mat_MPIDense   *mat = (Mat_MPIDense*)A->data;
705:   Mat            mdn = mat->A;
707:   PetscReal      isend[5],irecv[5];

710:   info->rows_global    = (double)A->rmap.N;
711:   info->columns_global = (double)A->cmap.N;
712:   info->rows_local     = (double)A->rmap.n;
713:   info->columns_local  = (double)A->cmap.N;
714:   info->block_size     = 1.0;
715:   MatGetInfo(mdn,MAT_LOCAL,info);
716:   isend[0] = info->nz_used; isend[1] = info->nz_allocated; isend[2] = info->nz_unneeded;
717:   isend[3] = info->memory;  isend[4] = info->mallocs;
718:   if (flag == MAT_LOCAL) {
719:     info->nz_used      = isend[0];
720:     info->nz_allocated = isend[1];
721:     info->nz_unneeded  = isend[2];
722:     info->memory       = isend[3];
723:     info->mallocs      = isend[4];
724:   } else if (flag == MAT_GLOBAL_MAX) {
725:     MPI_Allreduce(isend,irecv,5,MPIU_REAL,MPI_MAX,A->comm);
726:     info->nz_used      = irecv[0];
727:     info->nz_allocated = irecv[1];
728:     info->nz_unneeded  = irecv[2];
729:     info->memory       = irecv[3];
730:     info->mallocs      = irecv[4];
731:   } else if (flag == MAT_GLOBAL_SUM) {
732:     MPI_Allreduce(isend,irecv,5,MPIU_REAL,MPI_SUM,A->comm);
733:     info->nz_used      = irecv[0];
734:     info->nz_allocated = irecv[1];
735:     info->nz_unneeded  = irecv[2];
736:     info->memory       = irecv[3];
737:     info->mallocs      = irecv[4];
738:   }
739:   info->fill_ratio_given  = 0; /* no parallel LU/ILU/Cholesky */
740:   info->fill_ratio_needed = 0;
741:   info->factor_mallocs    = 0;
742:   return(0);
743: }

747: PetscErrorCode MatSetOption_MPIDense(Mat A,MatOption op)
748: {
749:   Mat_MPIDense   *a = (Mat_MPIDense*)A->data;

753:   switch (op) {
754:   case MAT_NO_NEW_NONZERO_LOCATIONS:
755:   case MAT_YES_NEW_NONZERO_LOCATIONS:
756:   case MAT_NEW_NONZERO_LOCATION_ERR:
757:   case MAT_NEW_NONZERO_ALLOCATION_ERR:
758:   case MAT_COLUMNS_SORTED:
759:   case MAT_COLUMNS_UNSORTED:
760:     MatSetOption(a->A,op);
761:     break;
762:   case MAT_ROW_ORIENTED:
763:     a->roworiented = PETSC_TRUE;
764:     MatSetOption(a->A,op);
765:     break;
766:   case MAT_ROWS_SORTED:
767:   case MAT_ROWS_UNSORTED:
768:   case MAT_YES_NEW_DIAGONALS:
769:   case MAT_USE_HASH_TABLE:
770:     PetscInfo(A,"Option ignored\n");
771:     break;
772:   case MAT_COLUMN_ORIENTED:
773:     a->roworiented = PETSC_FALSE;
774:     MatSetOption(a->A,op);
775:     break;
776:   case MAT_IGNORE_OFF_PROC_ENTRIES:
777:     a->donotstash = PETSC_TRUE;
778:     break;
779:   case MAT_NO_NEW_DIAGONALS:
780:     SETERRQ(PETSC_ERR_SUP,"MAT_NO_NEW_DIAGONALS");
781:   case MAT_SYMMETRIC:
782:   case MAT_STRUCTURALLY_SYMMETRIC:
783:   case MAT_NOT_SYMMETRIC:
784:   case MAT_NOT_STRUCTURALLY_SYMMETRIC:
785:   case MAT_HERMITIAN:
786:   case MAT_NOT_HERMITIAN:
787:   case MAT_SYMMETRY_ETERNAL:
788:   case MAT_NOT_SYMMETRY_ETERNAL:
789:     break;
790:   default:
791:     SETERRQ(PETSC_ERR_SUP,"unknown option");
792:   }
793:   return(0);
794: }


799: PetscErrorCode MatDiagonalScale_MPIDense(Mat A,Vec ll,Vec rr)
800: {
801:   Mat_MPIDense   *mdn = (Mat_MPIDense*)A->data;
802:   Mat_SeqDense   *mat = (Mat_SeqDense*)mdn->A->data;
803:   PetscScalar    *l,*r,x,*v;
805:   PetscInt       i,j,s2a,s3a,s2,s3,m=mdn->A->rmap.n,n=mdn->A->cmap.n;

808:   MatGetLocalSize(A,&s2,&s3);
809:   if (ll) {
810:     VecGetLocalSize(ll,&s2a);
811:     if (s2a != s2) SETERRQ2(PETSC_ERR_ARG_SIZ,"Left scaling vector non-conforming local size, %d != %d.", s2a, s2);
812:     VecGetArray(ll,&l);
813:     for (i=0; i<m; i++) {
814:       x = l[i];
815:       v = mat->v + i;
816:       for (j=0; j<n; j++) { (*v) *= x; v+= m;}
817:     }
818:     VecRestoreArray(ll,&l);
819:     PetscLogFlops(n*m);
820:   }
821:   if (rr) {
822:     VecGetLocalSize(rr,&s3a);
823:     if (s3a != s3) SETERRQ2(PETSC_ERR_ARG_SIZ,"Right scaling vec non-conforming local size, %d != %d.", s3a, s3);
824:     VecScatterBegin(rr,mdn->lvec,INSERT_VALUES,SCATTER_FORWARD,mdn->Mvctx);
825:     VecScatterEnd(rr,mdn->lvec,INSERT_VALUES,SCATTER_FORWARD,mdn->Mvctx);
826:     VecGetArray(mdn->lvec,&r);
827:     for (i=0; i<n; i++) {
828:       x = r[i];
829:       v = mat->v + i*m;
830:       for (j=0; j<m; j++) { (*v++) *= x;}
831:     }
832:     VecRestoreArray(mdn->lvec,&r);
833:     PetscLogFlops(n*m);
834:   }
835:   return(0);
836: }

840: PetscErrorCode MatNorm_MPIDense(Mat A,NormType type,PetscReal *nrm)
841: {
842:   Mat_MPIDense   *mdn = (Mat_MPIDense*)A->data;
843:   Mat_SeqDense   *mat = (Mat_SeqDense*)mdn->A->data;
845:   PetscInt       i,j;
846:   PetscReal      sum = 0.0;
847:   PetscScalar    *v = mat->v;

850:   if (mdn->size == 1) {
851:      MatNorm(mdn->A,type,nrm);
852:   } else {
853:     if (type == NORM_FROBENIUS) {
854:       for (i=0; i<mdn->A->cmap.n*mdn->A->rmap.n; i++) {
855: #if defined(PETSC_USE_COMPLEX)
856:         sum += PetscRealPart(PetscConj(*v)*(*v)); v++;
857: #else
858:         sum += (*v)*(*v); v++;
859: #endif
860:       }
861:       MPI_Allreduce(&sum,nrm,1,MPIU_REAL,MPI_SUM,A->comm);
862:       *nrm = sqrt(*nrm);
863:       PetscLogFlops(2*mdn->A->cmap.n*mdn->A->rmap.n);
864:     } else if (type == NORM_1) {
865:       PetscReal *tmp,*tmp2;
866:       PetscMalloc(2*A->cmap.N*sizeof(PetscReal),&tmp);
867:       tmp2 = tmp + A->cmap.N;
868:       PetscMemzero(tmp,2*A->cmap.N*sizeof(PetscReal));
869:       *nrm = 0.0;
870:       v = mat->v;
871:       for (j=0; j<mdn->A->cmap.n; j++) {
872:         for (i=0; i<mdn->A->rmap.n; i++) {
873:           tmp[j] += PetscAbsScalar(*v);  v++;
874:         }
875:       }
876:       MPI_Allreduce(tmp,tmp2,A->cmap.N,MPIU_REAL,MPI_SUM,A->comm);
877:       for (j=0; j<A->cmap.N; j++) {
878:         if (tmp2[j] > *nrm) *nrm = tmp2[j];
879:       }
880:       PetscFree(tmp);
881:       PetscLogFlops(A->cmap.n*A->rmap.n);
882:     } else if (type == NORM_INFINITY) { /* max row norm */
883:       PetscReal ntemp;
884:       MatNorm(mdn->A,type,&ntemp);
885:       MPI_Allreduce(&ntemp,nrm,1,MPIU_REAL,MPI_MAX,A->comm);
886:     } else {
887:       SETERRQ(PETSC_ERR_SUP,"No support for two norm");
888:     }
889:   }
890:   return(0);
891: }

895: PetscErrorCode MatTranspose_MPIDense(Mat A,Mat *matout)
896: {
897:   Mat_MPIDense   *a = (Mat_MPIDense*)A->data;
898:   Mat_SeqDense   *Aloc = (Mat_SeqDense*)a->A->data;
899:   Mat            B;
900:   PetscInt       M = A->rmap.N,N = A->cmap.N,m,n,*rwork,rstart = A->rmap.rstart;
902:   PetscInt       j,i;
903:   PetscScalar    *v;

906:   if (!matout && M != N) {
907:     SETERRQ(PETSC_ERR_SUP,"Supports square matrix only in-place");
908:   }
909:   MatCreate(A->comm,&B);
910:   MatSetSizes(B,PETSC_DECIDE,PETSC_DECIDE,N,M);
911:   MatSetType(B,A->type_name);
912:   MatMPIDenseSetPreallocation(B,PETSC_NULL);

914:   m = a->A->rmap.n; n = a->A->cmap.n; v = Aloc->v;
915:   PetscMalloc(n*sizeof(PetscInt),&rwork);
916:   for (j=0; j<n; j++) {
917:     for (i=0; i<m; i++) rwork[i] = rstart + i;
918:     MatSetValues(B,1,&j,m,rwork,v,INSERT_VALUES);
919:     v   += m;
920:   }
921:   PetscFree(rwork);
922:   MatAssemblyBegin(B,MAT_FINAL_ASSEMBLY);
923:   MatAssemblyEnd(B,MAT_FINAL_ASSEMBLY);
924:   if (matout) {
925:     *matout = B;
926:   } else {
927:     MatHeaderCopy(A,B);
928:   }
929:   return(0);
930: }

932:  #include petscblaslapack.h
935: PetscErrorCode MatScale_MPIDense(Mat inA,PetscScalar alpha)
936: {
937:   Mat_MPIDense   *A = (Mat_MPIDense*)inA->data;
938:   Mat_SeqDense   *a = (Mat_SeqDense*)A->A->data;
939:   PetscScalar    oalpha = alpha;
940:   PetscBLASInt   one = 1,nz = (PetscBLASInt)inA->rmap.n*inA->cmap.N;

944:   BLASscal_(&nz,&oalpha,a->v,&one);
945:   PetscLogFlops(nz);
946:   return(0);
947: }

949: static PetscErrorCode MatDuplicate_MPIDense(Mat,MatDuplicateOption,Mat *);

953: PetscErrorCode MatSetUpPreallocation_MPIDense(Mat A)
954: {

958:    MatMPIDenseSetPreallocation(A,0);
959:   return(0);
960: }

962: /* -------------------------------------------------------------------*/
963: static struct _MatOps MatOps_Values = {MatSetValues_MPIDense,
964:        MatGetRow_MPIDense,
965:        MatRestoreRow_MPIDense,
966:        MatMult_MPIDense,
967: /* 4*/ MatMultAdd_MPIDense,
968:        MatMultTranspose_MPIDense,
969:        MatMultTransposeAdd_MPIDense,
970:        0,
971:        0,
972:        0,
973: /*10*/ 0,
974:        0,
975:        0,
976:        0,
977:        MatTranspose_MPIDense,
978: /*15*/ MatGetInfo_MPIDense,
979:        0,
980:        MatGetDiagonal_MPIDense,
981:        MatDiagonalScale_MPIDense,
982:        MatNorm_MPIDense,
983: /*20*/ MatAssemblyBegin_MPIDense,
984:        MatAssemblyEnd_MPIDense,
985:        0,
986:        MatSetOption_MPIDense,
987:        MatZeroEntries_MPIDense,
988: /*25*/ MatZeroRows_MPIDense,
989:        MatLUFactorSymbolic_MPIDense,
990:        0,
991:        MatCholeskyFactorSymbolic_MPIDense,
992:        0,
993: /*30*/ MatSetUpPreallocation_MPIDense,
994:        0,
995:        0,
996:        MatGetArray_MPIDense,
997:        MatRestoreArray_MPIDense,
998: /*35*/ MatDuplicate_MPIDense,
999:        0,
1000:        0,
1001:        0,
1002:        0,
1003: /*40*/ 0,
1004:        MatGetSubMatrices_MPIDense,
1005:        0,
1006:        MatGetValues_MPIDense,
1007:        0,
1008: /*45*/ 0,
1009:        MatScale_MPIDense,
1010:        0,
1011:        0,
1012:        0,
1013: /*50*/ 0,
1014:        0,
1015:        0,
1016:        0,
1017:        0,
1018: /*55*/ 0,
1019:        0,
1020:        0,
1021:        0,
1022:        0,
1023: /*60*/ MatGetSubMatrix_MPIDense,
1024:        MatDestroy_MPIDense,
1025:        MatView_MPIDense,
1026:        0,
1027:        0,
1028: /*65*/ 0,
1029:        0,
1030:        0,
1031:        0,
1032:        0,
1033: /*70*/ 0,
1034:        0,
1035:        0,
1036:        0,
1037:        0,
1038: /*75*/ 0,
1039:        0,
1040:        0,
1041:        0,
1042:        0,
1043: /*80*/ 0,
1044:        0,
1045:        0,
1046:        0,
1047: /*84*/ MatLoad_MPIDense,
1048:        0,
1049:        0,
1050:        0,
1051:        0,
1052:        0,
1053: /*90*/ 0,
1054:        0,
1055:        0,
1056:        0,
1057:        0,
1058: /*95*/ 0,
1059:        0,
1060:        0,
1061:        0};

1066: PetscErrorCode PETSCMAT_DLLEXPORT MatMPIDenseSetPreallocation_MPIDense(Mat mat,PetscScalar *data)
1067: {
1068:   Mat_MPIDense   *a;

1072:   mat->preallocated = PETSC_TRUE;
1073:   /* Note:  For now, when data is specified above, this assumes the user correctly
1074:    allocates the local dense storage space.  We should add error checking. */

1076:   a    = (Mat_MPIDense*)mat->data;
1077:   MatCreate(PETSC_COMM_SELF,&a->A);
1078:   MatSetSizes(a->A,mat->rmap.n,mat->cmap.N,mat->rmap.n,mat->cmap.N);
1079:   MatSetType(a->A,MATSEQDENSE);
1080:   MatSeqDenseSetPreallocation(a->A,data);
1081:   PetscLogObjectParent(mat,a->A);
1082:   return(0);
1083: }

1086: /*MC
1087:    MATMPIDENSE - MATMPIDENSE = "mpidense" - A matrix type to be used for distributed dense matrices.

1089:    Options Database Keys:
1090: . -mat_type mpidense - sets the matrix type to "mpidense" during a call to MatSetFromOptions()

1092:   Level: beginner

1094: .seealso: MatCreateMPIDense
1095: M*/

1100: PetscErrorCode PETSCMAT_DLLEXPORT MatCreate_MPIDense(Mat mat)
1101: {
1102:   Mat_MPIDense   *a;

1106:   PetscNew(Mat_MPIDense,&a);
1107:   mat->data         = (void*)a;
1108:   PetscMemcpy(mat->ops,&MatOps_Values,sizeof(struct _MatOps));
1109:   mat->factor       = 0;
1110:   mat->mapping      = 0;

1112:   a->factor       = 0;
1113:   mat->insertmode = NOT_SET_VALUES;
1114:   MPI_Comm_rank(mat->comm,&a->rank);
1115:   MPI_Comm_size(mat->comm,&a->size);

1117:   mat->rmap.bs = mat->cmap.bs = 1;
1118:   PetscMapInitialize(mat->comm,&mat->rmap);
1119:   PetscMapInitialize(mat->comm,&mat->cmap);
1120:   a->nvec = mat->cmap.n;

1122:   /* build cache for off array entries formed */
1123:   a->donotstash = PETSC_FALSE;
1124:   MatStashCreate_Private(mat->comm,1,&mat->stash);

1126:   /* stuff used for matrix vector multiply */
1127:   a->lvec        = 0;
1128:   a->Mvctx       = 0;
1129:   a->roworiented = PETSC_TRUE;

1131:   PetscObjectComposeFunctionDynamic((PetscObject)mat,"MatGetDiagonalBlock_C",
1132:                                      "MatGetDiagonalBlock_MPIDense",
1133:                                      MatGetDiagonalBlock_MPIDense);
1134:   PetscObjectComposeFunctionDynamic((PetscObject)mat,"MatMPIDenseSetPreallocation_C",
1135:                                      "MatMPIDenseSetPreallocation_MPIDense",
1136:                                      MatMPIDenseSetPreallocation_MPIDense);
1137:   return(0);
1138: }

1141: /*MC
1142:    MATDENSE - MATDENSE = "dense" - A matrix type to be used for dense matrices.

1144:    This matrix type is identical to MATSEQDENSE when constructed with a single process communicator,
1145:    and MATMPIDENSE otherwise.

1147:    Options Database Keys:
1148: . -mat_type dense - sets the matrix type to "dense" during a call to MatSetFromOptions()

1150:   Level: beginner

1152: .seealso: MatCreateMPIDense,MATSEQDENSE,MATMPIDENSE
1153: M*/

1158: PetscErrorCode PETSCMAT_DLLEXPORT MatCreate_Dense(Mat A)
1159: {
1161:   PetscMPIInt    size;

1164:   PetscObjectChangeTypeName((PetscObject)A,MATDENSE);
1165:   MPI_Comm_size(A->comm,&size);
1166:   if (size == 1) {
1167:     MatSetType(A,MATSEQDENSE);
1168:   } else {
1169:     MatSetType(A,MATMPIDENSE);
1170:   }
1171:   return(0);
1172: }

1177: /*@C
1178:    MatMPIDenseSetPreallocation - Sets the array used to store the matrix entries

1180:    Not collective

1182:    Input Parameters:
1183: .  A - the matrix
1184: -  data - optional location of matrix data.  Set data=PETSC_NULL for PETSc
1185:    to control all matrix memory allocation.

1187:    Notes:
1188:    The dense format is fully compatible with standard Fortran 77
1189:    storage by columns.

1191:    The data input variable is intended primarily for Fortran programmers
1192:    who wish to allocate their own matrix memory space.  Most users should
1193:    set data=PETSC_NULL.

1195:    Level: intermediate

1197: .keywords: matrix,dense, parallel

1199: .seealso: MatCreate(), MatCreateSeqDense(), MatSetValues()
1200: @*/
1201: PetscErrorCode PETSCMAT_DLLEXPORT MatMPIDenseSetPreallocation(Mat mat,PetscScalar *data)
1202: {
1203:   PetscErrorCode ierr,(*f)(Mat,PetscScalar *);

1206:   PetscObjectQueryFunction((PetscObject)mat,"MatMPIDenseSetPreallocation_C",(void (**)(void))&f);
1207:   if (f) {
1208:     (*f)(mat,data);
1209:   }
1210:   return(0);
1211: }

1215: /*@C
1216:    MatCreateMPIDense - Creates a sparse parallel matrix in dense format.

1218:    Collective on MPI_Comm

1220:    Input Parameters:
1221: +  comm - MPI communicator
1222: .  m - number of local rows (or PETSC_DECIDE to have calculated if M is given)
1223: .  n - number of local columns (or PETSC_DECIDE to have calculated if N is given)
1224: .  M - number of global rows (or PETSC_DECIDE to have calculated if m is given)
1225: .  N - number of global columns (or PETSC_DECIDE to have calculated if n is given)
1226: -  data - optional location of matrix data.  Set data=PETSC_NULL (PETSC_NULL_SCALAR for Fortran users) for PETSc
1227:    to control all matrix memory allocation.

1229:    Output Parameter:
1230: .  A - the matrix

1232:    Notes:
1233:    The dense format is fully compatible with standard Fortran 77
1234:    storage by columns.

1236:    The data input variable is intended primarily for Fortran programmers
1237:    who wish to allocate their own matrix memory space.  Most users should
1238:    set data=PETSC_NULL (PETSC_NULL_SCALAR for Fortran users).

1240:    The user MUST specify either the local or global matrix dimensions
1241:    (possibly both).

1243:    Level: intermediate

1245: .keywords: matrix,dense, parallel

1247: .seealso: MatCreate(), MatCreateSeqDense(), MatSetValues()
1248: @*/
1249: PetscErrorCode PETSCMAT_DLLEXPORT MatCreateMPIDense(MPI_Comm comm,PetscInt m,PetscInt n,PetscInt M,PetscInt N,PetscScalar *data,Mat *A)
1250: {
1252:   PetscMPIInt    size;

1255:   MatCreate(comm,A);
1256:   MatSetSizes(*A,m,n,M,N);
1257:   MPI_Comm_size(comm,&size);
1258:   if (size > 1) {
1259:     MatSetType(*A,MATMPIDENSE);
1260:     MatMPIDenseSetPreallocation(*A,data);
1261:   } else {
1262:     MatSetType(*A,MATSEQDENSE);
1263:     MatSeqDenseSetPreallocation(*A,data);
1264:   }
1265:   return(0);
1266: }

1270: static PetscErrorCode MatDuplicate_MPIDense(Mat A,MatDuplicateOption cpvalues,Mat *newmat)
1271: {
1272:   Mat            mat;
1273:   Mat_MPIDense   *a,*oldmat = (Mat_MPIDense*)A->data;

1277:   *newmat       = 0;
1278:   MatCreate(A->comm,&mat);
1279:   MatSetSizes(mat,A->rmap.n,A->cmap.n,A->rmap.N,A->cmap.N);
1280:   MatSetType(mat,A->type_name);
1281:   a                 = (Mat_MPIDense*)mat->data;
1282:   PetscMemcpy(mat->ops,A->ops,sizeof(struct _MatOps));
1283:   mat->factor       = A->factor;
1284:   mat->assembled    = PETSC_TRUE;
1285:   mat->preallocated = PETSC_TRUE;

1287:   mat->rmap.rstart     = A->rmap.rstart;
1288:   mat->rmap.rend       = A->rmap.rend;
1289:   a->size              = oldmat->size;
1290:   a->rank              = oldmat->rank;
1291:   mat->insertmode      = NOT_SET_VALUES;
1292:   a->nvec              = oldmat->nvec;
1293:   a->donotstash        = oldmat->donotstash;
1294: 
1295:   PetscMalloc((a->size+1)*sizeof(PetscInt),&mat->rmap.range);
1296:   PetscMalloc((a->size+1)*sizeof(PetscInt),&mat->cmap.range);
1297:   PetscMemcpy(mat->rmap.range,A->rmap.range,(a->size+1)*sizeof(PetscInt));
1298:   PetscMemcpy(mat->cmap.range,A->cmap.range,(a->size+1)*sizeof(PetscInt));
1299:   MatStashCreate_Private(A->comm,1,&mat->stash);

1301:   MatSetUpMultiply_MPIDense(mat);
1302:   MatDuplicate(oldmat->A,cpvalues,&a->A);
1303:   PetscLogObjectParent(mat,a->A);
1304:   *newmat = mat;
1305:   return(0);
1306: }

1308:  #include petscsys.h

1312: PetscErrorCode MatLoad_MPIDense_DenseInFile(MPI_Comm comm,PetscInt fd,PetscInt M,PetscInt N, MatType type,Mat *newmat)
1313: {
1315:   PetscMPIInt    rank,size;
1316:   PetscInt       *rowners,i,m,nz,j;
1317:   PetscScalar    *array,*vals,*vals_ptr;
1318:   MPI_Status     status;

1321:   MPI_Comm_rank(comm,&rank);
1322:   MPI_Comm_size(comm,&size);

1324:   /* determine ownership of all rows */
1325:   m          = M/size + ((M % size) > rank);
1326:   PetscMalloc((size+2)*sizeof(PetscInt),&rowners);
1327:   MPI_Allgather(&m,1,MPIU_INT,rowners+1,1,MPIU_INT,comm);
1328:   rowners[0] = 0;
1329:   for (i=2; i<=size; i++) {
1330:     rowners[i] += rowners[i-1];
1331:   }

1333:   MatCreate(comm,newmat);
1334:   MatSetSizes(*newmat,m,PETSC_DECIDE,M,N);
1335:   MatSetType(*newmat,type);
1336:   MatMPIDenseSetPreallocation(*newmat,PETSC_NULL);
1337:   MatGetArray(*newmat,&array);

1339:   if (!rank) {
1340:     PetscMalloc(m*N*sizeof(PetscScalar),&vals);

1342:     /* read in my part of the matrix numerical values  */
1343:     PetscBinaryRead(fd,vals,m*N,PETSC_SCALAR);
1344: 
1345:     /* insert into matrix-by row (this is why cannot directly read into array */
1346:     vals_ptr = vals;
1347:     for (i=0; i<m; i++) {
1348:       for (j=0; j<N; j++) {
1349:         array[i + j*m] = *vals_ptr++;
1350:       }
1351:     }

1353:     /* read in other processors and ship out */
1354:     for (i=1; i<size; i++) {
1355:       nz   = (rowners[i+1] - rowners[i])*N;
1356:       PetscBinaryRead(fd,vals,nz,PETSC_SCALAR);
1357:       MPI_Send(vals,nz,MPIU_SCALAR,i,(*newmat)->tag,comm);
1358:     }
1359:   } else {
1360:     /* receive numeric values */
1361:     PetscMalloc(m*N*sizeof(PetscScalar),&vals);

1363:     /* receive message of values*/
1364:     MPI_Recv(vals,m*N,MPIU_SCALAR,0,(*newmat)->tag,comm,&status);

1366:     /* insert into matrix-by row (this is why cannot directly read into array */
1367:     vals_ptr = vals;
1368:     for (i=0; i<m; i++) {
1369:       for (j=0; j<N; j++) {
1370:         array[i + j*m] = *vals_ptr++;
1371:       }
1372:     }
1373:   }
1374:   PetscFree(rowners);
1375:   PetscFree(vals);
1376:   MatAssemblyBegin(*newmat,MAT_FINAL_ASSEMBLY);
1377:   MatAssemblyEnd(*newmat,MAT_FINAL_ASSEMBLY);
1378:   return(0);
1379: }

1383: PetscErrorCode MatLoad_MPIDense(PetscViewer viewer, MatType type,Mat *newmat)
1384: {
1385:   Mat            A;
1386:   PetscScalar    *vals,*svals;
1387:   MPI_Comm       comm = ((PetscObject)viewer)->comm;
1388:   MPI_Status     status;
1389:   PetscMPIInt    rank,size,tag = ((PetscObject)viewer)->tag,*rowners,*sndcounts,m,maxnz;
1390:   PetscInt       header[4],*rowlengths = 0,M,N,*cols;
1391:   PetscInt       *ourlens,*procsnz = 0,*offlens,jj,*mycols,*smycols;
1392:   PetscInt       i,nz,j,rstart,rend;
1393:   int            fd;

1397:   MPI_Comm_size(comm,&size);
1398:   MPI_Comm_rank(comm,&rank);
1399:   if (!rank) {
1400:     PetscViewerBinaryGetDescriptor(viewer,&fd);
1401:     PetscBinaryRead(fd,(char *)header,4,PETSC_INT);
1402:     if (header[0] != MAT_FILE_COOKIE) SETERRQ(PETSC_ERR_FILE_UNEXPECTED,"not matrix object");
1403:   }

1405:   MPI_Bcast(header+1,3,MPIU_INT,0,comm);
1406:   M = header[1]; N = header[2]; nz = header[3];

1408:   /*
1409:        Handle case where matrix is stored on disk as a dense matrix 
1410:   */
1411:   if (nz == MATRIX_BINARY_FORMAT_DENSE) {
1412:     MatLoad_MPIDense_DenseInFile(comm,fd,M,N,type,newmat);
1413:     return(0);
1414:   }

1416:   /* determine ownership of all rows */
1417:   m          = M/size + ((M % size) > rank);
1418:   PetscMalloc((size+2)*sizeof(PetscInt),&rowners);
1419:   MPI_Allgather(&m,1,MPI_INT,rowners+1,1,MPI_INT,comm);
1420:   rowners[0] = 0;
1421:   for (i=2; i<=size; i++) {
1422:     rowners[i] += rowners[i-1];
1423:   }
1424:   rstart = rowners[rank];
1425:   rend   = rowners[rank+1];

1427:   /* distribute row lengths to all processors */
1428:   PetscMalloc(2*(rend-rstart+1)*sizeof(PetscInt),&ourlens);
1429:   offlens = ourlens + (rend-rstart);
1430:   if (!rank) {
1431:     PetscMalloc(M*sizeof(PetscInt),&rowlengths);
1432:     PetscBinaryRead(fd,rowlengths,M,PETSC_INT);
1433:     PetscMalloc(size*sizeof(PetscMPIInt),&sndcounts);
1434:     for (i=0; i<size; i++) sndcounts[i] = rowners[i+1] - rowners[i];
1435:     MPI_Scatterv(rowlengths,sndcounts,rowners,MPIU_INT,ourlens,rend-rstart,MPIU_INT,0,comm);
1436:     PetscFree(sndcounts);
1437:   } else {
1438:     MPI_Scatterv(0,0,0,MPIU_INT,ourlens,rend-rstart,MPIU_INT,0,comm);
1439:   }

1441:   if (!rank) {
1442:     /* calculate the number of nonzeros on each processor */
1443:     PetscMalloc(size*sizeof(PetscInt),&procsnz);
1444:     PetscMemzero(procsnz,size*sizeof(PetscInt));
1445:     for (i=0; i<size; i++) {
1446:       for (j=rowners[i]; j< rowners[i+1]; j++) {
1447:         procsnz[i] += rowlengths[j];
1448:       }
1449:     }
1450:     PetscFree(rowlengths);

1452:     /* determine max buffer needed and allocate it */
1453:     maxnz = 0;
1454:     for (i=0; i<size; i++) {
1455:       maxnz = PetscMax(maxnz,procsnz[i]);
1456:     }
1457:     PetscMalloc(maxnz*sizeof(PetscInt),&cols);

1459:     /* read in my part of the matrix column indices  */
1460:     nz = procsnz[0];
1461:     PetscMalloc(nz*sizeof(PetscInt),&mycols);
1462:     PetscBinaryRead(fd,mycols,nz,PETSC_INT);

1464:     /* read in every one elses and ship off */
1465:     for (i=1; i<size; i++) {
1466:       nz   = procsnz[i];
1467:       PetscBinaryRead(fd,cols,nz,PETSC_INT);
1468:       MPI_Send(cols,nz,MPIU_INT,i,tag,comm);
1469:     }
1470:     PetscFree(cols);
1471:   } else {
1472:     /* determine buffer space needed for message */
1473:     nz = 0;
1474:     for (i=0; i<m; i++) {
1475:       nz += ourlens[i];
1476:     }
1477:     PetscMalloc((nz+1)*sizeof(PetscInt),&mycols);

1479:     /* receive message of column indices*/
1480:     MPI_Recv(mycols,nz,MPIU_INT,0,tag,comm,&status);
1481:     MPI_Get_count(&status,MPIU_INT,&maxnz);
1482:     if (maxnz != nz) SETERRQ(PETSC_ERR_FILE_UNEXPECTED,"something is wrong with file");
1483:   }

1485:   /* loop over local rows, determining number of off diagonal entries */
1486:   PetscMemzero(offlens,m*sizeof(PetscInt));
1487:   jj = 0;
1488:   for (i=0; i<m; i++) {
1489:     for (j=0; j<ourlens[i]; j++) {
1490:       if (mycols[jj] < rstart || mycols[jj] >= rend) offlens[i]++;
1491:       jj++;
1492:     }
1493:   }

1495:   /* create our matrix */
1496:   for (i=0; i<m; i++) {
1497:     ourlens[i] -= offlens[i];
1498:   }
1499:   MatCreate(comm,newmat);
1500:   MatSetSizes(*newmat,m,PETSC_DECIDE,M,N);
1501:   MatSetType(*newmat,type);
1502:   MatMPIDenseSetPreallocation(*newmat,PETSC_NULL);
1503:   A = *newmat;
1504:   for (i=0; i<m; i++) {
1505:     ourlens[i] += offlens[i];
1506:   }

1508:   if (!rank) {
1509:     PetscMalloc(maxnz*sizeof(PetscScalar),&vals);

1511:     /* read in my part of the matrix numerical values  */
1512:     nz = procsnz[0];
1513:     PetscBinaryRead(fd,vals,nz,PETSC_SCALAR);
1514: 
1515:     /* insert into matrix */
1516:     jj      = rstart;
1517:     smycols = mycols;
1518:     svals   = vals;
1519:     for (i=0; i<m; i++) {
1520:       MatSetValues(A,1,&jj,ourlens[i],smycols,svals,INSERT_VALUES);
1521:       smycols += ourlens[i];
1522:       svals   += ourlens[i];
1523:       jj++;
1524:     }

1526:     /* read in other processors and ship out */
1527:     for (i=1; i<size; i++) {
1528:       nz   = procsnz[i];
1529:       PetscBinaryRead(fd,vals,nz,PETSC_SCALAR);
1530:       MPI_Send(vals,nz,MPIU_SCALAR,i,A->tag,comm);
1531:     }
1532:     PetscFree(procsnz);
1533:   } else {
1534:     /* receive numeric values */
1535:     PetscMalloc((nz+1)*sizeof(PetscScalar),&vals);

1537:     /* receive message of values*/
1538:     MPI_Recv(vals,nz,MPIU_SCALAR,0,A->tag,comm,&status);
1539:     MPI_Get_count(&status,MPIU_SCALAR,&maxnz);
1540:     if (maxnz != nz) SETERRQ(PETSC_ERR_FILE_UNEXPECTED,"something is wrong with file");

1542:     /* insert into matrix */
1543:     jj      = rstart;
1544:     smycols = mycols;
1545:     svals   = vals;
1546:     for (i=0; i<m; i++) {
1547:       MatSetValues(A,1,&jj,ourlens[i],smycols,svals,INSERT_VALUES);
1548:       smycols += ourlens[i];
1549:       svals   += ourlens[i];
1550:       jj++;
1551:     }
1552:   }
1553:   PetscFree(ourlens);
1554:   PetscFree(vals);
1555:   PetscFree(mycols);
1556:   PetscFree(rowners);

1558:   MatAssemblyBegin(A,MAT_FINAL_ASSEMBLY);
1559:   MatAssemblyEnd(A,MAT_FINAL_ASSEMBLY);
1560:   return(0);
1561: }