Actual source code: mpiaijsbaij.c
petsc-3.15.0 2021-03-30
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      2: #include <../src/mat/impls/sbaij/mpi/mpisbaij.h>
      3: #include <../src/mat/impls/aij/mpi/mpiaij.h>
      4: #include <petsc/private/matimpl.h>
      5: #include <petscmat.h>

      7: PETSC_INTERN PetscErrorCode MatConvert_MPIAIJ_MPISBAIJ(Mat A, MatType newtype,MatReuse reuse,Mat *newmat)
      8: {
      9:   PetscErrorCode    ierr;
     10:   Mat               M;
     11:   Mat_MPIAIJ        *mpimat = (Mat_MPIAIJ*)A->data;
     12:   Mat_SeqAIJ        *Aa     = (Mat_SeqAIJ*)mpimat->A->data,*Ba = (Mat_SeqAIJ*)mpimat->B->data;
     13:   PetscInt          *d_nnz,*o_nnz;
     14:   PetscInt          i,j,nz;
     15:   PetscInt          m,n,lm,ln;
     16:   PetscInt          rstart,rend,bs=PetscAbs(A->rmap->bs);
     17:   const PetscScalar *vwork;
     18:   const PetscInt    *cwork;

     21:   if (!A->symmetric && !A->hermitian) SETERRQ(PetscObjectComm((PetscObject)A),PETSC_ERR_USER,"Matrix must be symmetric or hermitian. Call MatSetOption(mat,MAT_SYMMETRIC,PETSC_TRUE) or MatSetOption(mat,MAT_HERMITIAN,PETSC_TRUE)");
     22:   if (reuse != MAT_REUSE_MATRIX) {
     23:     MatGetSize(A,&m,&n);
     24:     MatGetLocalSize(A,&lm,&ln);
     25:     PetscMalloc2(lm/bs,&d_nnz,lm/bs,&o_nnz);

     27:     MatMarkDiagonal_SeqAIJ(mpimat->A);
     28:     for (i=0; i<lm/bs; i++) {
     29:       if (Aa->i[i*bs+1] == Aa->diag[i*bs]) { /* misses diagonal entry */
     30:         d_nnz[i] = (Aa->i[i*bs+1] - Aa->i[i*bs])/bs;
     31:       } else {
     32:         d_nnz[i] = (Aa->i[i*bs+1] - Aa->diag[i*bs])/bs;
     33:       }
     34:       o_nnz[i] = (Ba->i[i*bs+1] - Ba->i[i*bs])/bs;
     35:     }

     37:     MatCreate(PetscObjectComm((PetscObject)A),&M);
     38:     MatSetSizes(M,lm,ln,m,n);
     39:     MatSetType(M,MATMPISBAIJ);
     40:     MatSeqSBAIJSetPreallocation(M,bs,0,d_nnz);
     41:     MatMPISBAIJSetPreallocation(M,bs,0,d_nnz,0,o_nnz);
     42:     PetscFree2(d_nnz,o_nnz);
     43:   } else M = *newmat;

     45:   if (bs == 1) {
     46:     MatGetOwnershipRange(A,&rstart,&rend);
     47:     for (i=rstart; i<rend; i++) {
     48:       MatGetRow(A,i,&nz,&cwork,&vwork);
     49:       if (nz) {
     50:         j = 0;
     51:         while (cwork[j] < i) {
     52:           j++; nz--;
     53:         }
     54:         MatSetValues(M,1,&i,nz,cwork+j,vwork+j,INSERT_VALUES);
     55:       }
     56:       MatRestoreRow(A,i,&nz,&cwork,&vwork);
     57:     }
     58:     MatAssemblyBegin(M,MAT_FINAL_ASSEMBLY);
     59:     MatAssemblyEnd(M,MAT_FINAL_ASSEMBLY);
     60:   } else {
     61:     MatSetOption(M,MAT_IGNORE_LOWER_TRIANGULAR,PETSC_TRUE);
     62:     /* reuse may not be equal to MAT_REUSE_MATRIX, but the basic converter will reallocate or replace newmat if this value is not used */
     63:     /* if reuse is equal to MAT_INITIAL_MATRIX, it has been appropriately preallocated before                                          */
     64:     /*                      MAT_INPLACE_MATRIX, it will be replaced with MatHeaderReplace below                                        */
     65:     MatConvert_Basic(A,newtype,MAT_REUSE_MATRIX,&M);
     66:   }

     68:   if (reuse == MAT_INPLACE_MATRIX) {
     69:     MatHeaderReplace(A,&M);
     70:   } else *newmat = M;
     71:   return(0);
     72: }
     73: /* contributed by Dahai Guo <dhguo@ncsa.uiuc.edu> April 2011 */
     74: PETSC_INTERN PetscErrorCode MatConvert_MPIBAIJ_MPISBAIJ(Mat A, MatType newtype,MatReuse reuse,Mat *newmat)
     75: {
     76:   PetscErrorCode    ierr;
     77:   Mat               M;
     78:   Mat_MPIBAIJ       *mpimat = (Mat_MPIBAIJ*)A->data;
     79:   Mat_SeqBAIJ       *Aa     = (Mat_SeqBAIJ*)mpimat->A->data,*Ba = (Mat_SeqBAIJ*)mpimat->B->data;
     80:   PetscInt          *d_nnz,*o_nnz;
     81:   PetscInt          i,nz;
     82:   PetscInt          m,n,lm,ln;
     83:   PetscInt          rstart,rend;
     84:   const PetscScalar *vwork;
     85:   const PetscInt    *cwork;
     86:   PetscInt          bs = A->rmap->bs;

     89:   if (reuse != MAT_REUSE_MATRIX) {
     90:     MatGetSize(A,&m,&n);
     91:     MatGetLocalSize(A,&lm,&ln);
     92:     PetscMalloc2(lm/bs,&d_nnz,lm/bs,&o_nnz);

     94:     MatMarkDiagonal_SeqBAIJ(mpimat->A);
     95:     for (i=0; i<lm/bs; i++) {
     96:       d_nnz[i] = Aa->i[i+1] - Aa->diag[i];
     97:       o_nnz[i] = Ba->i[i+1] - Ba->i[i];
     98:     }

    100:     MatCreate(PetscObjectComm((PetscObject)A),&M);
    101:     MatSetSizes(M,lm,ln,m,n);
    102:     MatSetType(M,MATMPISBAIJ);
    103:     MatSeqSBAIJSetPreallocation(M,bs,0,d_nnz);
    104:     MatMPISBAIJSetPreallocation(M,bs,0,d_nnz,0,o_nnz);

    106:     PetscFree2(d_nnz,o_nnz);
    107:   } else M = *newmat;

    109:   MatGetOwnershipRange(A,&rstart,&rend);
    110:   MatSetOption(M,MAT_IGNORE_LOWER_TRIANGULAR,PETSC_TRUE);
    111:   for (i=rstart; i<rend; i++) {
    112:     MatGetRow(A,i,&nz,&cwork,&vwork);
    113:     MatSetValues(M,1,&i,nz,cwork,vwork,INSERT_VALUES);
    114:     MatRestoreRow(A,i,&nz,&cwork,&vwork);
    115:   }
    116:   MatAssemblyBegin(M,MAT_FINAL_ASSEMBLY);
    117:   MatAssemblyEnd(M,MAT_FINAL_ASSEMBLY);

    119:   if (reuse == MAT_INPLACE_MATRIX) {
    120:     MatHeaderReplace(A,&M);
    121:   } else *newmat = M;
    122:   return(0);
    123: }