Actual source code: ex2.c


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

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

  8: int main(int argc, char **argv)
  9: {
 10:   PetscMPIInt rank, size;
 11:   PetscInt    n, *ispetsc, *isapp, start, N, i;
 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:   n = rank + 2;
 19:   MPI_Comm_size(PETSC_COMM_WORLD, &size);

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

 24:   MPI_Scan(&n, &start, 1, MPIU_INT, MPI_SUM, PETSC_COMM_WORLD);
 25:   MPI_Allreduce(&n, &N, 1, MPIU_INT, MPI_SUM, PETSC_COMM_WORLD);
 26:   start -= n;

 28:   for (i = 0; i < n; i++) {
 29:     ispetsc[i] = start + i;
 30:     isapp[i]   = N - start - i - 1;
 31:   }

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

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

 44:   AODestroy(&ao);
 45:   PetscFinalize();
 46:   return 0;
 47: }

 49: /*TEST

 51:    test:

 53:    test:
 54:       suffix: 2
 55:       nsize: 2

 57:    test:
 58:       suffix: 3
 59:       nsize: 3

 61: TEST*/