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:   Mat         M;
 10:   Mat_MPIAIJ *mpimat = (Mat_MPIAIJ *)A->data;
 11:   Mat_SeqAIJ *Aa = (Mat_SeqAIJ *)mpimat->A->data, *Ba = (Mat_SeqAIJ *)mpimat->B->data;
 12:   PetscInt   *d_nnz, *o_nnz;
 13:   PetscInt    i, m, n, lm, ln, bs = PetscAbs(A->rmap->bs);

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

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

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

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

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