Actual source code: ex42.c

  1: static char help[] = "Test DMCreateFieldDecomposition_Stag()\n\n";

  3: #include <petscdm.h>
  4: #include <petscdmstag.h>

  6: int main(int argc, char **argv)
  7: {
  8:   DM       dm;
  9:   DM      *sub_dms;
 10:   PetscInt dim, n_fields;
 11:   IS      *fields;
 12:   char   **field_names;

 14:   PetscFunctionBeginUser;
 15:   PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));
 16:   dim = 2;
 17:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-dim", &dim, NULL));

 19:   switch (dim) {
 20:   case 1:
 21:     PetscCall(DMStagCreate1d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, 3, 1, 1, DMSTAG_STENCIL_BOX, 1, NULL, &dm));
 22:     break;
 23:   case 2:
 24:     PetscCall(DMStagCreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, 3, 2, PETSC_DECIDE, PETSC_DECIDE, 1, 1, 1, DMSTAG_STENCIL_BOX, 1, NULL, NULL, &dm));
 25:     break;
 26:   case 3:
 27:     PetscCall(DMStagCreate3d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, 3, 2, 4, PETSC_DECIDE, PETSC_DECIDE, PETSC_DECIDE, 1, 1, 1, 1, DMSTAG_STENCIL_BOX, 1, NULL, NULL, NULL, &dm));
 28:     break;
 29:   default:
 30:     SETERRQ(PETSC_COMM_WORLD, PETSC_ERR_SUP, "No support for dimension %" PetscInt_FMT, dim);
 31:   }

 33:   PetscCall(DMSetFromOptions(dm));
 34:   PetscCall(DMSetUp(dm));
 35:   PetscCall(DMView(dm, PETSC_VIEWER_STDOUT_WORLD));

 37:   PetscCall(DMCreateFieldDecomposition(dm, &n_fields, &field_names, &fields, &sub_dms));
 38:   for (PetscInt i = 0; i < n_fields; ++i) {
 39:     PetscCall(PetscPrintf(PETSC_COMM_WORLD, "%" PetscInt_FMT " %s\n", i, field_names[i]));
 40:     PetscCall(ISView(fields[i], PETSC_VIEWER_STDOUT_WORLD));
 41:     PetscCall(DMView(sub_dms[i], PETSC_VIEWER_STDOUT_WORLD));
 42:   }

 44:   for (PetscInt i = 0; i < n_fields; ++i) {
 45:     PetscCall(PetscFree(field_names[i]));
 46:     PetscCall(ISDestroy(&fields[i]));
 47:     PetscCall(DMDestroy(&sub_dms[i]));
 48:   }
 49:   PetscCall(PetscFree(fields));
 50:   PetscCall(PetscFree(field_names));
 51:   PetscCall(PetscFree(sub_dms));
 52:   PetscCall(DMDestroy(&dm));
 53:   PetscCall(PetscFinalize());
 54:   return 0;
 55: }

 57: /*TEST

 59:    test:
 60:       nsize: 2
 61:       args: -dim {{1 2 3}separate output}

 63: TEST*/