Actual source code: mpimattransposematmult.c
petsc-3.10.5 2019-03-28
Report Typos and Errors

      2: /*
      3:   Defines matrix-matrix product routines for pairs of MPIAIJ matrices
      4:           C = A^T * B
      5:   The routines are slightly modified from MatTransposeMatMultxxx_SeqAIJ_SeqDense().
      6: */
      7:  #include <../src/mat/impls/aij/seq/aij.h>
      8:  #include <../src/mat/impls/aij/mpi/mpiaij.h>
      9:  #include <../src/mat/impls/dense/mpi/mpidense.h>

     11: PetscErrorCode MatDestroy_MPIDense_MatTransMatMult(Mat A)
     12: {
     13:   PetscErrorCode      ierr;
     14:   Mat_MPIDense        *a = (Mat_MPIDense*)A->data;
     15:   Mat_MatTransMatMult *atb = a->atb;

     18:   MatDestroy(&atb->mA);
     19:   VecDestroy(&atb->bt);
     20:   VecDestroy(&atb->ct);
     21:   (atb->destroy)(A);
     22:   PetscFree(atb);
     23:   return(0);
     24: }

     26: PetscErrorCode MatTransposeMatMult_MPIAIJ_MPIDense(Mat A,Mat B,MatReuse scall,PetscReal fill,Mat *C)
     27: {

     31:   if (scall == MAT_INITIAL_MATRIX) {
     32:     PetscLogEventBegin(MAT_TransposeMatMultSymbolic,A,B,0,0);
     33:     MatTransposeMatMultSymbolic_MPIAIJ_MPIDense(A,B,fill,C);
     34:     PetscLogEventEnd(MAT_TransposeMatMultSymbolic,A,B,0,0);
     35:   }
     36:   PetscLogEventBegin(MAT_TransposeMatMultNumeric,A,B,0,0);
     37:   MatTransposeMatMultNumeric_MPIAIJ_MPIDense(A,B,*C);
     38:   PetscLogEventEnd(MAT_TransposeMatMultNumeric,A,B,0,0);
     39:   return(0);
     40: }

     42: PetscErrorCode MatTransposeMatMultSymbolic_MPIAIJ_MPIDense(Mat A,Mat B,PetscReal fill,Mat *C)
     43: {
     44:   PetscErrorCode      ierr;
     45:   PetscInt            m=A->rmap->n,n=A->cmap->n,BN=B->cmap->N;
     46:   Mat_MatTransMatMult *atb;
     47:   Mat                 Cdense;
     48:   Vec                 bt,ct;
     49:   Mat_MPIDense        *c;
     50:
     52:   PetscNew(&atb);

     54:   /* create output dense matrix C = A^T*B */
     55:   MatCreate(PetscObjectComm((PetscObject)A),&Cdense);
     56:   MatSetSizes(Cdense,n,PETSC_DECIDE,PETSC_DECIDE,BN);
     57:   MatSetType(Cdense,MATMPIDENSE);
     58:   MatMPIDenseSetPreallocation(Cdense,NULL);

     60:   /* create vectors bt and ct to hold locally transposed arrays of B and C */
     61:   VecCreate(PetscObjectComm((PetscObject)A),&bt);
     62:   VecSetSizes(bt,m*BN,PETSC_DECIDE);
     63:   VecSetType(bt,VECSTANDARD);
     64:   VecCreate(PetscObjectComm((PetscObject)A),&ct);
     65:   VecSetSizes(ct,n*BN,PETSC_DECIDE);
     66:   VecSetType(ct,VECSTANDARD);
     67:   atb->bt = bt;
     68:   atb->ct = ct;

     70:   *C = Cdense;
     71:   c                    = (Mat_MPIDense*)Cdense->data;
     72:   c->atb               = atb;
     73:   atb->destroy         = Cdense->ops->destroy;
     74:   Cdense->ops->destroy = MatDestroy_MPIDense_MatTransMatMult;
     75:   return(0);
     76: }

     78: PetscErrorCode MatTransposeMatMultNumeric_MPIAIJ_MPIDense(Mat A,Mat B,Mat C)
     79: {
     80:   PetscErrorCode      ierr;
     81:   PetscInt            i,j,k,m=A->rmap->n,n=A->cmap->n,BN=B->cmap->N;
     82:   PetscScalar         *Barray,*Carray,*btarray,*ctarray;
     83:   Mat_MPIDense        *c=(Mat_MPIDense*)C->data;
     84:   Mat_MatTransMatMult *atb=c->atb;
     85:   Vec                 bt=atb->bt,ct=atb->ct;

     88:   /* create MAIJ matrix mA from A -- should be done in symbolic phase */
     89:   MatDestroy(&atb->mA);
     90:   MatCreateMAIJ(A,BN,&atb->mA);

     92:   /* transpose local arry of B, then copy it to vector bt */
     93:   MatDenseGetArray(B,&Barray);
     94:   VecGetArray(bt,&btarray);

     96:   k=0;
     97:   for (j=0; j<BN; j++) {
     98:     for (i=0; i<m; i++) btarray[i*BN + j] = Barray[k++];
     99:   }
    100:   VecRestoreArray(bt,&btarray);
    101:   MatDenseRestoreArray(B,&Barray);

    103:   /* compute ct = mA^T * cb */
    104:   MatMultTranspose(atb->mA,bt,ct);

    106:   /* transpose local arry of ct to matrix C */
    107:   MatDenseGetArray(C,&Carray);
    108:   VecGetArray(ct,&ctarray);
    109:   k = 0;
    110:   for (j=0; j<BN; j++) {
    111:     for (i=0; i<n; i++) Carray[k++] = ctarray[i*BN + j];
    112:   }
    113:   VecRestoreArray(ct,&ctarray);
    114:   MatDenseRestoreArray(C,&Carray);
    115:   MatAssemblyBegin(C,MAT_FINAL_ASSEMBLY);
    116:   MatAssemblyEnd(C,MAT_FINAL_ASSEMBLY);
    117:   return(0);
    118: }