Actual source code: ex7.c


  2: static char help[] = "Demonstrates constructing an application ordering.\n\n";

  4: #include <petscao.h>
  5: #include <petscviewer.h>

  7: int main(int argc, char **argv)
  8: {
  9:   PetscInt    n = 5;
 10:   PetscMPIInt rank, size;
 11:   IS          ispetsc, isapp;
 12:   AO          ao;

 14:   PetscFunctionBeginUser;
 15:   PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
 16:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL));
 17:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
 18:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));

 20:   /* create the index sets */
 21:   PetscCall(ISCreateStride(PETSC_COMM_WORLD, n, rank, size, &ispetsc));
 22:   PetscCall(ISCreateStride(PETSC_COMM_WORLD, n, n * rank, 1, &isapp));

 24:   /* create the application ordering */
 25:   PetscCall(AOCreateBasicIS(isapp, ispetsc, &ao));

 27:   PetscCall(AOView(ao, PETSC_VIEWER_STDOUT_WORLD));

 29:   PetscCall(ISView(ispetsc, PETSC_VIEWER_STDOUT_WORLD));
 30:   PetscCall(ISView(isapp, PETSC_VIEWER_STDOUT_WORLD));
 31:   PetscCall(AOPetscToApplicationIS(ao, ispetsc));
 32:   PetscCall(ISView(isapp, PETSC_VIEWER_STDOUT_WORLD));
 33:   PetscCall(ISView(ispetsc, PETSC_VIEWER_STDOUT_WORLD));

 35:   PetscCall(ISDestroy(&ispetsc));
 36:   PetscCall(ISDestroy(&isapp));

 38:   PetscCall(AODestroy(&ao));
 39:   PetscCall(PetscFinalize());
 40:   return 0;
 41: }

 43: /*TEST

 45:    test:
 46:       nsize: 2

 48: TEST*/