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;

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

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

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

 27:   AOView(ao, PETSC_VIEWER_STDOUT_WORLD);

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

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

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

 43: /*TEST

 45:    test:
 46:       nsize: 2

 48: TEST*/