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: }