Actual source code: ex44.c

  1: static char help[] = "Tests various DMComposite routines.\n\n";

  3: #include <petscdm.h>
  4: #include <petscdmda.h>
  5: #include <petscdmcomposite.h>

  7: int main(int argc, char **argv)
  8: {
  9:   PetscMPIInt rank;
 10:   DM          da1, da2, packer;
 11:   Vec         local, global, globals[2], buffer;
 12:   PetscScalar value, *array;
 13:   PetscInt    n;
 14:   PetscViewer viewer;

 16:   PetscFunctionBeginUser;
 17:   PetscCall(PetscInitialize(&argc, &argv, NULL, help));

 19:   PetscCall(DMCompositeCreate(PETSC_COMM_WORLD, &packer));
 20:   PetscCall(DMDACreate1d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, 8, 1, 1, NULL, &da1));
 21:   PetscCall(DMSetFromOptions(da1));
 22:   PetscCall(DMSetUp(da1));
 23:   PetscCall(DMCompositeAddDM(packer, da1));
 24:   PetscCall(DMDACreate1d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, 6, 1, 1, NULL, &da2));
 25:   PetscCall(DMSetFromOptions(da2));
 26:   PetscCall(DMSetUp(da2));
 27:   PetscCall(DMCompositeAddDM(packer, da2));

 29:   PetscCall(DMCreateGlobalVector(packer, &global));
 30:   PetscCall(DMCreateLocalVector(packer, &local));
 31:   PetscCall(DMCreateLocalVector(packer, &buffer));

 33:   PetscCall(DMCompositeGetAccessArray(packer, global, 2, NULL, globals));
 34:   value = 1;
 35:   PetscCall(VecSet(globals[0], value));
 36:   value = -1;
 37:   PetscCall(VecSet(globals[1], value));
 38:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
 39:   value = rank + 1;
 40:   PetscCall(VecGetLocalSize(globals[0], &n));
 41:   PetscCall(VecGetArray(globals[0], &array));
 42:   for (PetscInt i = 0; i < n; i++) array[i] *= value;
 43:   PetscCall(VecRestoreArray(globals[0], &array));
 44:   PetscCall(VecGetLocalSize(globals[1], &n));
 45:   PetscCall(VecGetArray(globals[1], &array));
 46:   for (PetscInt i = 0; i < n; i++) array[i] *= value;
 47:   PetscCall(VecRestoreArray(globals[1], &array));
 48:   PetscCall(DMCompositeRestoreAccessArray(packer, global, 2, NULL, globals));

 50:   /* Test GlobalToLocal in insert mode */
 51:   PetscCall(DMGlobalToLocalBegin(packer, global, INSERT_VALUES, local));
 52:   PetscCall(DMGlobalToLocalEnd(packer, global, INSERT_VALUES, local));

 54:   PetscCall(PetscViewerASCIIPushSynchronized(PETSC_VIEWER_STDOUT_WORLD));
 55:   PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &viewer));
 56:   PetscCall(PetscViewerASCIIPrintf(viewer, "\nLocal Vector: processor %d\n", rank));
 57:   PetscCall(VecView(local, viewer));
 58:   PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &viewer));
 59:   PetscCall(PetscViewerASCIIPopSynchronized(PETSC_VIEWER_STDOUT_WORLD));

 61:   /* Test LocalToGlobal in insert mode */
 62:   PetscCall(DMLocalToGlobalBegin(packer, local, INSERT_VALUES, global));
 63:   PetscCall(DMLocalToGlobalEnd(packer, local, INSERT_VALUES, global));

 65:   PetscCall(VecView(global, PETSC_VIEWER_STDOUT_WORLD));

 67:   /* Test LocalToLocal in insert mode */
 68:   PetscCall(DMLocalToLocalBegin(packer, local, INSERT_VALUES, buffer));
 69:   PetscCall(DMLocalToLocalEnd(packer, local, INSERT_VALUES, buffer));

 71:   PetscCall(PetscViewerASCIIPushSynchronized(PETSC_VIEWER_STDOUT_WORLD));
 72:   PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &viewer));
 73:   PetscCall(PetscViewerASCIIPrintf(viewer, "\nLocal Vector: processor %d\n", rank));
 74:   PetscCall(VecView(buffer, viewer));
 75:   PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &viewer));
 76:   PetscCall(PetscViewerASCIIPopSynchronized(PETSC_VIEWER_STDOUT_WORLD));

 78:   PetscCall(VecDestroy(&buffer));
 79:   PetscCall(VecDestroy(&local));
 80:   PetscCall(VecDestroy(&global));
 81:   PetscCall(DMDestroy(&packer));
 82:   PetscCall(DMDestroy(&da2));
 83:   PetscCall(DMDestroy(&da1));

 85:   PetscCall(PetscFinalize());
 86:   return 0;
 87: }

 89: /*TEST

 91:    test:
 92:       nsize: 3

 94: TEST*/