Actual source code: mpiaijsbaij.c
petsc-3.7.1 2016-05-15
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      2: #include <../src/mat/impls/sbaij/mpi/mpisbaij.h> /*I "petscmat.h" I*/
      3: #include <../src/mat/impls/aij/mpi/mpiaij.h>
      4: #include <petsc/private/matimpl.h>
      5: #include <petscmat.h>

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

     23:   if (!A->symmetric) SETERRQ(PetscObjectComm((PetscObject)A),PETSC_ERR_USER,"Matrix must be symmetric. Call MatSetOption(mat,MAT_SYMMETRIC,PETSC_TRUE)");
     24:   MatGetSize(A,&m,&n);
     25:   MatGetLocalSize(A,&lm,&ln);
     26:   PetscMalloc2(lm,&d_nnz,lm,&o_nnz);

     28:   MatMarkDiagonal_SeqAIJ(mpimat->A);
     29:   for (i=0; i<lm; i++) {
     30:     d_nnz[i] = Aa->i[i+1] - Aa->diag[i];
     31:     o_nnz[i] = Ba->i[i+1] - Ba->i[i];
     32:   }

     34:   MatCreate(PetscObjectComm((PetscObject)A),&M);
     35:   MatSetSizes(M,lm,ln,m,n);
     36:   MatSetType(M,MATMPISBAIJ);
     37:   MatSeqSBAIJSetPreallocation(M,1,0,d_nnz);
     38:   MatMPISBAIJSetPreallocation(M,1,0,d_nnz,0,o_nnz);

     40:   PetscFree2(d_nnz,o_nnz);

     42:   MatGetOwnershipRange(A,&rstart,&rend);
     43:   for (i=rstart; i<rend; i++) {
     44:     MatGetRow(A,i,&nz,&cwork,&vwork);
     45:     j    = 0;
     46:     while (cwork[j] < i) {
     47:       j++; nz--;
     48:     }
     49:     MatSetValues(M,1,&i,nz,cwork+j,vwork+j,INSERT_VALUES);
     50:     MatRestoreRow(A,i,&nz,&cwork,&vwork);
     51:   }
     52:   MatAssemblyBegin(M,MAT_FINAL_ASSEMBLY);
     53:   MatAssemblyEnd(M,MAT_FINAL_ASSEMBLY);

     55:   if (reuse == MAT_INPLACE_MATRIX) {
     56:     MatHeaderReplace(A,&M);
     57:   } else {
     58:     *newmat = M;
     59:   }
     60:   return(0);
     61: }
     62: /* contributed by Dahai Guo <dhguo@ncsa.uiuc.edu> April 2011 */
     65: PETSC_INTERN PetscErrorCode MatConvert_MPIBAIJ_MPISBAIJ(Mat A, MatType newtype,MatReuse reuse,Mat *newmat)
     66: {
     67:   PetscErrorCode    ierr;
     68:   Mat               M;
     69:   Mat_MPIBAIJ       *mpimat = (Mat_MPIBAIJ*)A->data;
     70:   Mat_SeqBAIJ       *Aa     = (Mat_SeqBAIJ*)mpimat->A->data,*Ba = (Mat_SeqBAIJ*)mpimat->B->data;
     71:   PetscInt          *d_nnz,*o_nnz;
     72:   PetscInt          i,j,nz;
     73:   PetscInt          m,n,lm,ln;
     74:   PetscInt          rstart,rend;
     75:   const PetscScalar *vwork;
     76:   const PetscInt    *cwork;
     77:   PetscInt          bs = A->rmap->bs;

     80:   MatGetSize(A,&m,&n);
     81:   MatGetLocalSize(A,&lm,&ln);
     82:   PetscMalloc2(lm/bs,&d_nnz,lm/bs,&o_nnz);

     84:   MatMarkDiagonal_SeqBAIJ(mpimat->A);
     85:   for (i=0; i<lm/bs; i++) {
     86:     d_nnz[i] = Aa->i[i+1] - Aa->diag[i];
     87:     o_nnz[i] = Ba->i[i+1] - Ba->i[i];
     88:   }

     90:   MatCreate(PetscObjectComm((PetscObject)A),&M);
     91:   MatSetSizes(M,lm,ln,m,n);
     92:   MatSetType(M,MATMPISBAIJ);
     93:   MatSeqSBAIJSetPreallocation(M,bs,0,d_nnz);
     94:   MatMPISBAIJSetPreallocation(M,bs,0,d_nnz,0,o_nnz);

     96:   PetscFree2(d_nnz,o_nnz);

     98:   MatGetOwnershipRange(A,&rstart,&rend);
     99:   MatSetOption(M,MAT_IGNORE_LOWER_TRIANGULAR,PETSC_TRUE);
    100:   for (i=rstart; i<rend; i++) {
    101:     MatGetRow(A,i,&nz,&cwork,&vwork);
    102:     j    = 0;
    103:     MatSetValues(M,1,&i,nz,cwork+j,vwork+j,INSERT_VALUES);
    104:     MatRestoreRow(A,i,&nz,&cwork,&vwork);
    105:   }
    106:   MatAssemblyBegin(M,MAT_FINAL_ASSEMBLY);
    107:   MatAssemblyEnd(M,MAT_FINAL_ASSEMBLY);

    109:   if (reuse == MAT_INPLACE_MATRIX) {
    110:     MatHeaderReplace(A,&M);
    111:   } else {
    112:     *newmat = M;
    113:   }
    114:   return(0);
    115: }