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;
 13:   PetscViewer viewer;

 15:   PetscFunctionBeginUser;
 16:   PetscCall(PetscInitialize(&argc, &argv, (char *)0, help));

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

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

 32:   PetscCall(DMCompositeGetAccessArray(packer, global, 2, NULL, globals));
 33:   value = 1;
 34:   PetscCall(VecSet(globals[0], value));
 35:   value = -1;
 36:   PetscCall(VecSet(globals[1], value));
 37:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
 38:   value = rank + 1;
 39:   PetscCall(VecScale(globals[0], value));
 40:   PetscCall(VecScale(globals[1], value));
 41:   PetscCall(DMCompositeRestoreAccessArray(packer, global, 2, NULL, globals));

 43:   /* Test GlobalToLocal in insert mode */
 44:   PetscCall(DMGlobalToLocalBegin(packer, global, INSERT_VALUES, local));
 45:   PetscCall(DMGlobalToLocalEnd(packer, global, INSERT_VALUES, local));

 47:   PetscCall(PetscViewerASCIIPushSynchronized(PETSC_VIEWER_STDOUT_WORLD));
 48:   PetscCall(PetscViewerASCIISynchronizedPrintf(PETSC_VIEWER_STDOUT_WORLD, "\nLocal Vector: processor %d\n", rank));
 49:   PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &viewer));
 50:   PetscCall(VecView(local, viewer));
 51:   PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &viewer));
 52:   PetscCall(PetscViewerFlush(PETSC_VIEWER_STDOUT_WORLD));
 53:   PetscCall(PetscViewerASCIIPopSynchronized(PETSC_VIEWER_STDOUT_WORLD));

 55:   /* Test LocalToGlobal in insert mode */
 56:   PetscCall(DMLocalToGlobalBegin(packer, local, INSERT_VALUES, global));
 57:   PetscCall(DMLocalToGlobalEnd(packer, local, INSERT_VALUES, global));

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

 61:   /* Test LocalToLocal in insert mode */
 62:   PetscCall(DMLocalToLocalBegin(packer, local, INSERT_VALUES, buffer));
 63:   PetscCall(DMLocalToLocalEnd(packer, local, INSERT_VALUES, buffer));

 65:   PetscCall(PetscViewerASCIIPushSynchronized(PETSC_VIEWER_STDOUT_WORLD));
 66:   PetscCall(PetscViewerASCIISynchronizedPrintf(PETSC_VIEWER_STDOUT_WORLD, "\nLocal Vector: processor %d\n", rank));
 67:   PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &viewer));
 68:   PetscCall(VecView(buffer, viewer));
 69:   PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &viewer));
 70:   PetscCall(PetscViewerFlush(PETSC_VIEWER_STDOUT_WORLD));
 71:   PetscCall(PetscViewerASCIIPopSynchronized(PETSC_VIEWER_STDOUT_WORLD));

 73:   PetscCall(VecDestroy(&buffer));
 74:   PetscCall(VecDestroy(&local));
 75:   PetscCall(VecDestroy(&global));
 76:   PetscCall(DMDestroy(&packer));
 77:   PetscCall(DMDestroy(&da2));
 78:   PetscCall(DMDestroy(&da1));

 80:   PetscCall(PetscFinalize());
 81:   return 0;
 82: }

 84: /*TEST

 86:    test:
 87:       nsize: 3

 89: TEST*/