Actual source code: mpimatmatmult.c

  1: #define PETSCMAT_DLL

  3: /*
  4:   Defines matrix-matrix product routines for pairs of MPIAIJ matrices
  5:           C = A * B
  6: */
 7:  #include src/mat/impls/aij/seq/aij.h
 8:  #include src/mat/utils/freespace.h
 9:  #include src/mat/impls/aij/mpi/mpiaij.h
 10:  #include petscbt.h

 14: PetscErrorCode MatMatMult_MPIAIJ_MPIAIJ(Mat A,Mat B,MatReuse scall,PetscReal fill, Mat *C)
 15: {

 19:   if (scall == MAT_INITIAL_MATRIX){
 20:     MatMatMultSymbolic_MPIAIJ_MPIAIJ(A,B,fill,C);/* numeric product is computed as well */
 21:   } else if (scall == MAT_REUSE_MATRIX){
 22:     MatMatMultNumeric_MPIAIJ_MPIAIJ(A,B,*C);
 23:   } else {
 24:     SETERRQ1(PETSC_ERR_ARG_WRONG,"Invalid MatReuse %d",(int)scall);
 25:   }
 26:   return(0);
 27: }

 31: PetscErrorCode PetscObjectContainerDestroy_Mat_MatMatMultMPI(void *ptr)
 32: {
 33:   PetscErrorCode       ierr;
 34:   Mat_MatMatMultMPI    *mult=(Mat_MatMatMultMPI*)ptr;

 37:   if (mult->startsj){PetscFree(mult->startsj);}
 38:   if (mult->bufa){PetscFree(mult->bufa);}
 39:   if (mult->isrowa){ISDestroy(mult->isrowa);}
 40:   if (mult->isrowb){ISDestroy(mult->isrowb);}
 41:   if (mult->iscolb){ISDestroy(mult->iscolb);}
 42:   if (mult->C_seq){MatDestroy(mult->C_seq);}
 43:   if (mult->A_loc){MatDestroy(mult->A_loc); }
 44:   if (mult->B_seq){MatDestroy(mult->B_seq);}
 45:   if (mult->B_loc){MatDestroy(mult->B_loc);}
 46:   if (mult->B_oth){MatDestroy(mult->B_oth);}
 47:   if (mult->abi){PetscFree(mult->abi);}
 48:   if (mult->abj){PetscFree(mult->abj);}
 49:   PetscFree(mult);
 50:   return(0);
 51: }

 53: EXTERN PetscErrorCode MatDestroy_AIJ(Mat);
 56: PetscErrorCode MatDestroy_MPIAIJ_MatMatMult(Mat A)
 57: {
 58:   PetscErrorCode       ierr;
 59:   PetscObjectContainer container;
 60:   Mat_MatMatMultMPI    *mult=PETSC_NULL;

 63:   PetscObjectQuery((PetscObject)A,"Mat_MatMatMultMPI",(PetscObject *)&container);
 64:   if (container) {
 65:     PetscObjectContainerGetPointer(container,(void **)&mult);
 66:   } else {
 67:     SETERRQ(PETSC_ERR_ARG_NULL,"Container does not exit");
 68:   }
 69:   PetscObjectCompose((PetscObject)A,"Mat_MatMatMultMPI",0);
 70:   (*mult->MatDestroy)(A);
 71:   PetscObjectContainerDestroy(container);
 72:   return(0);
 73: }

 77: PetscErrorCode MatMatMultSymbolic_MPIAIJ_MPIAIJ(Mat A,Mat B,PetscReal fill,Mat *C)
 78: {
 79:   Mat_MPIAIJ           *a=(Mat_MPIAIJ*)A->data,*b=(Mat_MPIAIJ*)B->data;
 80:   PetscErrorCode       ierr;
 81:   PetscInt             start,end;
 82:   Mat_MatMatMultMPI    *mult;
 83:   PetscObjectContainer container;
 84: 
 86:   if (a->cstart != b->rstart || a->cend != b->rend){
 87:     SETERRQ4(PETSC_ERR_ARG_SIZ,"Matrix local dimensions are incompatible, (%D, %D) != (%D,%D)",a->cstart,a->cend,b->rstart,b->rend);
 88:   }
 89:   PetscNew(Mat_MatMatMultMPI,&mult);

 91:   /* create a seq matrix B_seq = submatrix of B by taking rows of B that equal to nonzero col of A */
 92:   MatGetBrowsOfAcols(A,B,MAT_INITIAL_MATRIX,&mult->isrowb,&mult->iscolb,&mult->brstart,&mult->B_seq);

 94:   /*  create a seq matrix A_seq = submatrix of A by taking all local rows of A */
 95:   start = a->rstart; end = a->rend;
 96:   ISCreateStride(PETSC_COMM_SELF,end-start,start,1,&mult->isrowa);
 97:   MatGetLocalMatCondensed(A,MAT_INITIAL_MATRIX,&mult->isrowa,&mult->isrowb,&mult->A_loc);

 99:   /* compute C_seq = A_seq * B_seq */
100:   MatMatMult_SeqAIJ_SeqAIJ(mult->A_loc,mult->B_seq,MAT_INITIAL_MATRIX,fill,&mult->C_seq);

102:   /* create mpi matrix C by concatinating C_seq */
103:   PetscObjectReference((PetscObject)mult->C_seq); /* prevent C_seq being destroyed by MatMerge() */
104:   MatMerge(A->comm,mult->C_seq,B->n,MAT_INITIAL_MATRIX,C);
105: 
106:   /* attach the supporting struct to C for reuse of symbolic C */
107:   PetscObjectContainerCreate(PETSC_COMM_SELF,&container);
108:   PetscObjectContainerSetPointer(container,mult);
109:   PetscObjectCompose((PetscObject)(*C),"Mat_MatMatMultMPI",(PetscObject)container);
110:   PetscObjectContainerSetUserDestroy(container,PetscObjectContainerDestroy_Mat_MatMatMultMPI);
111:   mult->MatDestroy = (*C)->ops->destroy;

113:   (*C)->ops->destroy  = MatDestroy_MPIAIJ_MatMatMult;
114:   return(0);
115: }

117: /* This routine is called ONLY in the case of reusing previously computed symbolic C */
120: PetscErrorCode MatMatMultNumeric_MPIAIJ_MPIAIJ(Mat A,Mat B,Mat C)
121: {
122:   PetscErrorCode       ierr;
123:   Mat                  *seq;
124:   Mat_MatMatMultMPI    *mult;
125:   PetscObjectContainer container;

128:   PetscObjectQuery((PetscObject)C,"Mat_MatMatMultMPI",(PetscObject *)&container);
129:   if (container) {
130:     PetscObjectContainerGetPointer(container,(void **)&mult);
131:   }

133:   seq = &mult->B_seq;
134:   MatGetSubMatrices(B,1,&mult->isrowb,&mult->iscolb,MAT_REUSE_MATRIX,&seq);
135:   mult->B_seq = *seq;
136: 
137:   seq = &mult->A_loc;
138:   MatGetSubMatrices(A,1,&mult->isrowa,&mult->isrowb,MAT_REUSE_MATRIX,&seq);
139:   mult->A_loc = *seq;

141:   MatMatMult_SeqAIJ_SeqAIJ(mult->A_loc,mult->B_seq,MAT_REUSE_MATRIX,0.0,&mult->C_seq);

143:   PetscObjectReference((PetscObject)mult->C_seq);
144:   MatMerge(A->comm,mult->C_seq,B->n,MAT_REUSE_MATRIX,&C);
145:   return(0);
146: }