1 #include <../src/mat/impls/baij/mpi/mpibaij.h> 2 3 #undef __FUNCT__ 4 #define __FUNCT__ "MatGetMultiProcBlock_MPIBAIJ" 5 PetscErrorCode MatGetMultiProcBlock_MPIBAIJ(Mat mat, MPI_Comm subComm, MatReuse scall,Mat *subMat) 6 { 7 PetscErrorCode ierr; 8 Mat_MPIBAIJ *aij = (Mat_MPIBAIJ*)mat->data; 9 Mat_SeqBAIJ *aijB = (Mat_SeqBAIJ*)aij->B->data; 10 PetscMPIInt commRank,subCommSize,subCommRank; 11 PetscMPIInt *commRankMap,subRank,rank,commsize; 12 PetscInt *garrayCMap,col,i,j,*nnz,newRow,newCol,*newbRow,*newbCol,k,k1; 13 PetscInt bs=mat->rmap->bs; 14 PetscScalar *vals,*aijBvals; 15 16 PetscFunctionBegin; 17 ierr = MPI_Comm_size(PetscObjectComm((PetscObject)mat),&commsize);CHKERRQ(ierr); 18 ierr = MPI_Comm_size(subComm,&subCommSize);CHKERRQ(ierr); 19 20 /* create subMat object with the relavent layout */ 21 if (scall == MAT_INITIAL_MATRIX) { 22 ierr = MatCreate(subComm,subMat);CHKERRQ(ierr); 23 ierr = MatSetType(*subMat,MATMPIBAIJ);CHKERRQ(ierr); 24 ierr = MatSetSizes(*subMat,mat->rmap->n,mat->cmap->n,PETSC_DECIDE,PETSC_DECIDE);CHKERRQ(ierr); 25 ierr = MatSetBlockSizes(*subMat,mat->rmap->bs,mat->cmap->bs);CHKERRQ(ierr); 26 27 /* need to setup rmap and cmap before Preallocation */ 28 ierr = PetscLayoutSetBlockSize((*subMat)->rmap,mat->rmap->bs);CHKERRQ(ierr); 29 ierr = PetscLayoutSetBlockSize((*subMat)->cmap,mat->cmap->bs);CHKERRQ(ierr); 30 ierr = PetscLayoutSetUp((*subMat)->rmap);CHKERRQ(ierr); 31 ierr = PetscLayoutSetUp((*subMat)->cmap);CHKERRQ(ierr); 32 } 33 34 /* create a map of comm_rank from subComm to comm - should commRankMap and garrayCMap be kept for reused? */ 35 ierr = MPI_Comm_rank(PetscObjectComm((PetscObject)mat),&commRank);CHKERRQ(ierr); 36 ierr = MPI_Comm_rank(subComm,&subCommRank);CHKERRQ(ierr); 37 ierr = PetscMalloc1(subCommSize,&commRankMap);CHKERRQ(ierr); 38 ierr = MPI_Allgather(&commRank,1,MPI_INT,commRankMap,1,MPI_INT,subComm);CHKERRQ(ierr); 39 40 /* Traverse garray and identify blocked column indices [of offdiag mat] that 41 should be discarded. For the ones not discarded, store the newCol+1 42 value in garrayCMap */ 43 ierr = PetscMalloc1(aij->B->cmap->n/bs,&garrayCMap);CHKERRQ(ierr); 44 ierr = PetscMemzero(garrayCMap,aij->B->cmap->n/bs*sizeof(PetscInt));CHKERRQ(ierr); 45 for (i=0; i<aij->B->cmap->n/bs; i++) { 46 col = aij->garray[i]; /* blocked column index */ 47 for (subRank=0; subRank<subCommSize; subRank++) { 48 rank = commRankMap[subRank]; 49 if ((col >= mat->cmap->range[rank]/bs) && (col < mat->cmap->range[rank+1]/bs)) { 50 garrayCMap[i] = (((*subMat)->cmap->range[subRank]- mat->cmap->range[rank])/bs + col + 1); 51 break; 52 } 53 } 54 } 55 56 if (scall == MAT_INITIAL_MATRIX) { 57 /* Now compute preallocation for the offdiag mat */ 58 ierr = PetscMalloc1(aij->B->rmap->n/bs,&nnz);CHKERRQ(ierr); 59 ierr = PetscMemzero(nnz,aij->B->rmap->n/bs*sizeof(PetscInt));CHKERRQ(ierr); 60 for (i=0; i<aij->B->rmap->n/bs; i++) { 61 for (j=aijB->i[i]; j<aijB->i[i+1]; j++) { 62 if (garrayCMap[aijB->j[j]]) nnz[i]++; 63 } 64 } 65 ierr = MatMPIBAIJSetPreallocation(*(subMat),bs,0,NULL,0,nnz);CHKERRQ(ierr); 66 67 /* reuse diag block with the new submat */ 68 ierr = MatDestroy(&((Mat_MPIBAIJ*)((*subMat)->data))->A);CHKERRQ(ierr); 69 70 ((Mat_MPIBAIJ*)((*subMat)->data))->A = aij->A; 71 72 ierr = PetscObjectReference((PetscObject)aij->A);CHKERRQ(ierr); 73 } else if (((Mat_MPIBAIJ*)(*subMat)->data)->A != aij->A) { 74 PetscObject obj = (PetscObject)((Mat_MPIBAIJ*)((*subMat)->data))->A; 75 76 ierr = PetscObjectReference((PetscObject)obj);CHKERRQ(ierr); 77 78 ((Mat_MPIBAIJ*)((*subMat)->data))->A = aij->A; 79 80 ierr = PetscObjectReference((PetscObject)aij->A);CHKERRQ(ierr); 81 } 82 83 /* Now traverse aij->B and insert values into subMat */ 84 ierr = PetscMalloc3(bs,&newbRow,bs,&newbCol,bs*bs,&vals);CHKERRQ(ierr); 85 for (i=0; i<aij->B->rmap->n/bs; i++) { 86 newRow = (*subMat)->rmap->range[subCommRank] + i*bs; 87 for (j=aijB->i[i]; j<aijB->i[i+1]; j++) { 88 newCol = garrayCMap[aijB->j[j]]; 89 if (newCol) { 90 newCol--; /* remove the increment */ 91 newCol *= bs; 92 for (k=0; k<bs; k++) { 93 newbRow[k] = newRow + k; 94 newbCol[k] = newCol + k; 95 } 96 /* copy column-oriented aijB->a into row-oriented vals */ 97 aijBvals = aijB->a + j*bs*bs; 98 for (k1=0; k1<bs; k1++) { 99 for (k=0; k<bs; k++) { 100 vals[k1+k*bs] = *aijBvals++; 101 } 102 } 103 ierr = MatSetValues(*subMat,bs,newbRow,bs,newbCol,vals,INSERT_VALUES);CHKERRQ(ierr); 104 } 105 } 106 } 107 ierr = MatAssemblyBegin(*subMat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 108 ierr = MatAssemblyEnd(*subMat,MAT_FINAL_ASSEMBLY);CHKERRQ(ierr); 109 110 /* deallocate temporary data */ 111 ierr = PetscFree3(newbRow,newbCol,vals);CHKERRQ(ierr); 112 ierr = PetscFree(commRankMap);CHKERRQ(ierr); 113 ierr = PetscFree(garrayCMap);CHKERRQ(ierr); 114 if (scall == MAT_INITIAL_MATRIX) { 115 ierr = PetscFree(nnz);CHKERRQ(ierr); 116 } 117 PetscFunctionReturn(0); 118 } 119