Actual source code: ex2.c

  1: static char help[] = "Tests application ordering.\n\n";

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

  7: int main(int argc, char **argv)
  8: {
  9:   PetscMPIInt rank, size;
 10:   PetscInt    n, *ispetsc, *isapp, start, N, i;
 11:   AO          ao;

 13:   PetscFunctionBeginUser;
 14:   PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
 15:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-n", &n, NULL));
 16:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
 17:   n = rank + 2;
 18:   PetscCallMPI(MPI_Comm_size(PETSC_COMM_WORLD, &size));

 20:   /* create the orderings */
 21:   PetscCall(PetscMalloc2(n, &ispetsc, n, &isapp));

 23:   PetscCallMPI(MPI_Scan(&n, &start, 1, MPIU_INT, MPI_SUM, PETSC_COMM_WORLD));
 24:   PetscCall(MPIU_Allreduce(&n, &N, 1, MPIU_INT, MPI_SUM, PETSC_COMM_WORLD));
 25:   start -= n;

 27:   for (i = 0; i < n; i++) {
 28:     ispetsc[i] = start + i;
 29:     isapp[i]   = N - start - i - 1;
 30:   }

 32:   /* create the application ordering */
 33:   PetscCall(AOCreateBasic(PETSC_COMM_WORLD, n, isapp, ispetsc, &ao));
 34:   PetscCall(AOView(ao, PETSC_VIEWER_STDOUT_WORLD));

 36:   /* check the mapping */
 37:   PetscCall(AOPetscToApplication(ao, n, ispetsc));
 38:   for (i = 0; i < n; i++) {
 39:     if (ispetsc[i] != isapp[i]) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "[%d] Problem with mapping %" PetscInt_FMT " to %" PetscInt_FMT "\n", rank, i, ispetsc[i]));
 40:   }
 41:   PetscCall(PetscFree2(ispetsc, isapp));

 43:   PetscCall(AODestroy(&ao));
 44:   PetscCall(PetscFinalize());
 45:   return 0;
 46: }

 48: /*TEST

 50:    test:

 52:    test:
 53:       suffix: 2
 54:       nsize: 2

 56:    test:
 57:       suffix: 3
 58:       nsize: 3

 60: TEST*/