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: }