1 2 #include <../src/mat/impls/baij/mpi/mpibaij.h> /*I "petscmat.h" I*/ 3 #include <../src/mat/impls/aij/mpi/mpiaij.h> 4 #include <petsc/private/matimpl.h> 5 #include <petscmat.h> 6 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); 14 15 PetscFunctionBegin; 16 if (reuse != MAT_REUSE_MATRIX) { 17 PetscCall(MatGetSize(A,&m,&n)); 18 PetscCall(MatGetLocalSize(A,&lm,&ln)); 19 PetscCall(PetscMalloc2(lm/bs,&d_nnz,lm/bs,&o_nnz)); 20 21 for (i=0; i<lm/bs; i++) { 22 d_nnz[i] = (Aa->i[i*bs+1] - Aa->i[i*bs])/bs; 23 o_nnz[i] = (Ba->i[i*bs+1] - Ba->i[i*bs])/bs; 24 } 25 26 PetscCall(MatCreate(PetscObjectComm((PetscObject)A),&M)); 27 PetscCall(MatSetSizes(M,lm,ln,m,n)); 28 PetscCall(MatSetType(M,MATMPIBAIJ)); 29 PetscCall(MatSeqBAIJSetPreallocation(M,bs,0,d_nnz)); 30 PetscCall(MatMPIBAIJSetPreallocation(M,bs,0,d_nnz,0,o_nnz)); 31 PetscCall(PetscFree2(d_nnz,o_nnz)); 32 } else M = *newmat; 33 34 /* reuse may not be equal to MAT_REUSE_MATRIX, but the basic converter will reallocate or replace newmat if this value is not used */ 35 /* if reuse is equal to MAT_INITIAL_MATRIX, it has been appropriately preallocated before */ 36 /* MAT_INPLACE_MATRIX, it will be replaced with MatHeaderReplace below */ 37 PetscCall(MatConvert_Basic(A,newtype,MAT_REUSE_MATRIX,&M)); 38 39 if (reuse == MAT_INPLACE_MATRIX) { 40 PetscCall(MatHeaderReplace(A,&M)); 41 } else *newmat = M; 42 PetscFunctionReturn(0); 43 } 44