Date: 2022-03-04T17:37:51+00:00

Actual source code: mpiaijbaij.c

      2: #include <../src/mat/impls/baij/mpi/mpibaij.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_MPIBAIJ(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,m,n,lm,ln,bs=PetscAbs(A->rmap->bs);

     17:   if (reuse != MAT_REUSE_MATRIX) {
     18:     MatGetSize(A,&m,&n);
     19:     MatGetLocalSize(A,&lm,&ln);
     20:     PetscMalloc2(lm/bs,&d_nnz,lm/bs,&o_nnz);

     22:     for (i=0; i<lm/bs; i++) {
     23:       d_nnz[i] = (Aa->i[i*bs+1] - Aa->i[i*bs])/bs;
     24:       o_nnz[i] = (Ba->i[i*bs+1] - Ba->i[i*bs])/bs;
     25:     }

     27:     MatCreate(PetscObjectComm((PetscObject)A),&M);
     28:     MatSetSizes(M,lm,ln,m,n);
     29:     MatSetType(M,MATMPIBAIJ);
     30:     MatSeqBAIJSetPreallocation(M,bs,0,d_nnz);
     31:     MatMPIBAIJSetPreallocation(M,bs,0,d_nnz,0,o_nnz);
     32:     PetscFree2(d_nnz,o_nnz);
     33:   } else M = *newmat;

     35:   /* reuse may not be equal to MAT_REUSE_MATRIX, but the basic converter will reallocate or replace newmat if this value is not used */
     36:   /* if reuse is equal to MAT_INITIAL_MATRIX, it has been appropriately preallocated before                                          */
     37:   /*                      MAT_INPLACE_MATRIX, it will be replaced with MatHeaderReplace below                                        */
     38:   MatConvert_Basic(A,newtype,MAT_REUSE_MATRIX,&M);

     40:   if (reuse == MAT_INPLACE_MATRIX) {
     41:     MatHeaderReplace(A,&M);
     42:   } else *newmat = M;
     43:   return(0);
     44: }