Actual source code: ex98.c


  2: static char help[] = "Tests MatMPIAIJSetPreallocationCSR()\n\n";

  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>

 14: int main(int argc, char **args)
 15: {
 16:   Mat         A;
 17:   PetscInt   *ia, *ja;
 18:   PetscMPIInt rank, size;

 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));

 26:   PetscCall(PetscMalloc1(5, &ia));
 27:   PetscCall(PetscMalloc1(16, &ja));
 28:   if (rank == 0) {
 29:     ja[0] = 1;
 30:     ja[1] = 4;
 31:     ja[2] = 0;
 32:     ja[3] = 2;
 33:     ja[4] = 5;
 34:     ja[5] = 1;
 35:     ja[6] = 3;
 36:     ja[7] = 6;
 37:     ja[8] = 2;
 38:     ja[9] = 7;
 39:     ia[0] = 0;
 40:     ia[1] = 2;
 41:     ia[2] = 5;
 42:     ia[3] = 8;
 43:     ia[4] = 10;
 44:   } else if (rank == 1) {
 45:     ja[0]  = 0;
 46:     ja[1]  = 5;
 47:     ja[2]  = 8;
 48:     ja[3]  = 1;
 49:     ja[4]  = 4;
 50:     ja[5]  = 6;
 51:     ja[6]  = 9;
 52:     ja[7]  = 2;
 53:     ja[8]  = 5;
 54:     ja[9]  = 7;
 55:     ja[10] = 10;
 56:     ja[11] = 3;
 57:     ja[12] = 6;
 58:     ja[13] = 11;
 59:     ia[0]  = 0;
 60:     ia[1]  = 3;
 61:     ia[2]  = 7;
 62:     ia[3]  = 11;
 63:     ia[4]  = 14;
 64:   } else if (rank == 2) {
 65:     ja[0]  = 4;
 66:     ja[1]  = 9;
 67:     ja[2]  = 12;
 68:     ja[3]  = 5;
 69:     ja[4]  = 8;
 70:     ja[5]  = 10;
 71:     ja[6]  = 13;
 72:     ja[7]  = 6;
 73:     ja[8]  = 9;
 74:     ja[9]  = 11;
 75:     ja[10] = 14;
 76:     ja[11] = 7;
 77:     ja[12] = 10;
 78:     ja[13] = 15;
 79:     ia[0]  = 0;
 80:     ia[1]  = 3;
 81:     ia[2]  = 7;
 82:     ia[3]  = 11;
 83:     ia[4]  = 14;
 84:   } else {
 85:     ja[0] = 8;
 86:     ja[1] = 13;
 87:     ja[2] = 9;
 88:     ja[3] = 12;
 89:     ja[4] = 14;
 90:     ja[5] = 10;
 91:     ja[6] = 13;
 92:     ja[7] = 15;
 93:     ja[8] = 11;
 94:     ja[9] = 14;
 95:     ia[0] = 0;
 96:     ia[1] = 2;
 97:     ia[2] = 5;
 98:     ia[3] = 8;
 99:     ia[4] = 10;
100:   }

102:   PetscCall(MatCreate(PETSC_COMM_WORLD, &A));
103:   PetscCall(MatSetSizes(A, 4, 4, 16, 16));
104:   PetscCall(MatSetType(A, MATMPIAIJ));
105:   PetscCall(MatMPIAIJSetPreallocationCSR(A, ia, ja, NULL));
106:   PetscCall(PetscFree(ia));
107:   PetscCall(PetscFree(ja));
108:   PetscCall(MatView(A, PETSC_VIEWER_STDOUT_WORLD));
109:   PetscCall(MatDestroy(&A));
110:   PetscCall(PetscFinalize());
111:   return 0;
112: }

114: /*TEST

116:    test:
117:       nsize: 4

119: TEST*/