1 2 static char help[] = "Tests MatMPIAIJSetPreallocationCSR()\n\n"; 3 4 /* 5 Include "petscmat.h" so that we can use matrices. Note that this file 6 automatically includes: 7 petscsys.h - base PETSc routines petscvec.h - vectors 8 petscmat.h - matrices 9 petscis.h - index sets 10 petscviewer.h - viewers 11 */ 12 #include <petscmat.h> 13 14 int main(int argc,char **args) 15 { 16 Mat A; 17 PetscInt *ia,*ja; 18 PetscMPIInt rank,size; 19 20 PetscFunctionBeginUser; 21 PetscCall(PetscInitialize(&argc,&args,(char*)0,help)); 22 PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD,&size)); 23 PetscCheck(size == 4,PETSC_COMM_WORLD,PETSC_ERR_WRONG_MPI_SIZE,"Must run with 4 processors"); 24 PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD,&rank)); 25 26 PetscCall(PetscMalloc1(5,&ia)); 27 PetscCall(PetscMalloc1(16,&ja)); 28 if (rank == 0) { 29 ja[0] = 1; ja[1] = 4; ja[2] = 0; ja[3] = 2; ja[4] = 5; ja[5] = 1; ja[6] = 3; ja[7] = 6; 30 ja[8] = 2; ja[9] = 7; 31 ia[0] = 0; ia[1] = 2; ia[2] = 5; ia[3] = 8; ia[4] = 10; 32 } else if (rank == 1) { 33 ja[0] = 0; ja[1] = 5; ja[2] = 8; ja[3] = 1; ja[4] = 4; ja[5] = 6; ja[6] = 9; ja[7] = 2; 34 ja[8] = 5; ja[9] = 7; ja[10] = 10; ja[11] = 3; ja[12] = 6; ja[13] = 11; 35 ia[0] = 0; ia[1] = 3; ia[2] = 7; ia[3] = 11; ia[4] = 14; 36 } else if (rank == 2) { 37 ja[0] = 4; ja[1] = 9; ja[2] = 12; ja[3] = 5; ja[4] = 8; ja[5] = 10; ja[6] = 13; ja[7] = 6; 38 ja[8] = 9; ja[9] = 11; ja[10] = 14; ja[11] = 7; ja[12] = 10; ja[13] = 15; 39 ia[0] = 0; ia[1] = 3; ia[2] = 7; ia[3] = 11; ia[4] = 14; 40 } else { 41 ja[0] = 8; ja[1] = 13; ja[2] = 9; ja[3] = 12; ja[4] = 14; ja[5] = 10; ja[6] = 13; ja[7] = 15; 42 ja[8] = 11; ja[9] = 14; 43 ia[0] = 0; ia[1] = 2; ia[2] = 5; ia[3] = 8; ia[4] = 10; 44 } 45 46 PetscCall(MatCreate(PETSC_COMM_WORLD,&A)); 47 PetscCall(MatSetSizes(A,4,4,16,16)); 48 PetscCall(MatSetType(A,MATMPIAIJ)); 49 PetscCall(MatMPIAIJSetPreallocationCSR(A,ia,ja,NULL)); 50 PetscCall(PetscFree(ia)); 51 PetscCall(PetscFree(ja)); 52 PetscCall(MatView(A,PETSC_VIEWER_STDOUT_WORLD)); 53 PetscCall(MatDestroy(&A)); 54 PetscCall(PetscFinalize()); 55 return 0; 56 } 57 58 /*TEST 59 60 test: 61 nsize: 4 62 63 TEST*/ 64