Actual source code: ex2.c

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

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

  7: int main(int argc, char **argv)
  8: {
  9:   PetscMPIInt            rank;
 10:   PetscInt               M = 13, s = 1, dof = 1, n;
 11:   DMBoundaryType         bx = DM_BOUNDARY_PERIODIC;
 12:   DM                     da;
 13:   PetscViewer            viewer;
 14:   Vec                    local, global;
 15:   PetscScalar            value, *array;
 16:   PetscDraw              draw;
 17:   PetscBool              flg = PETSC_FALSE;
 18:   ISLocalToGlobalMapping is;

 20:   PetscFunctionBeginUser;
 21:   PetscCall(PetscInitialize(&argc, &argv, NULL, help));
 22:   PetscCall(PetscViewerDrawOpen(PETSC_COMM_WORLD, 0, "", 280, 480, 600, 200, &viewer));
 23:   PetscCall(PetscViewerDrawGetDraw(viewer, 0, &draw));
 24:   PetscCall(PetscDrawSetDoubleBuffer(draw));

 26:   /* Readoptions */
 27:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-M", &M, NULL));
 28:   PetscCall(PetscOptionsGetEnum(NULL, NULL, "-wrap", DMBoundaryTypes, (PetscEnum *)&bx, NULL));
 29:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-dof", &dof, NULL));
 30:   PetscCall(PetscOptionsGetInt(NULL, NULL, "-s", &s, NULL));

 32:   /* Create distributed array and get vectors */
 33:   PetscCall(DMDACreate1d(PETSC_COMM_WORLD, bx, M, dof, s, NULL, &da));
 34:   PetscCall(DMSetFromOptions(da));
 35:   PetscCall(DMSetUp(da));
 36:   PetscCall(DMView(da, viewer));
 37:   PetscCall(DMCreateGlobalVector(da, &global));
 38:   PetscCall(DMCreateLocalVector(da, &local));

 40:   value = 1;
 41:   PetscCall(VecSet(global, value));

 43:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
 44:   value = rank + 1;
 45:   PetscCall(VecGetLocalSize(global, &n));
 46:   PetscCall(VecGetArray(global, &array));
 47:   for (PetscInt i = 0; i < n; i++) array[i] *= value;
 48:   PetscCall(VecRestoreArray(global, &array));

 50:   PetscCall(VecView(global, viewer));
 51:   PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD, "\nGlobal Vector:\n"));
 52:   PetscCall(VecView(global, PETSC_VIEWER_STDOUT_WORLD));
 53:   PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD, "\n"));

 55:   /* Send ghost points to local vectors */
 56:   PetscCall(DMGlobalToLocalBegin(da, global, INSERT_VALUES, local));
 57:   PetscCall(DMGlobalToLocalEnd(da, global, INSERT_VALUES, local));

 59:   PetscCall(PetscOptionsGetBool(NULL, NULL, "-local_print", &flg, NULL));
 60:   if (flg) {
 61:     PetscViewer sviewer;

 63:     PetscCall(PetscViewerASCIIPushSynchronized(PETSC_VIEWER_STDOUT_WORLD));
 64:     PetscCall(PetscViewerGetSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer));
 65:     PetscCall(PetscViewerASCIIPrintf(sviewer, "\nLocal Vector: processor %d\n", rank));
 66:     PetscCall(VecView(local, sviewer));
 67:     PetscCall(PetscViewerRestoreSubViewer(PETSC_VIEWER_STDOUT_WORLD, PETSC_COMM_SELF, &sviewer));
 68:     PetscCall(PetscViewerASCIIPopSynchronized(PETSC_VIEWER_STDOUT_WORLD));
 69:   }
 70:   PetscCall(PetscViewerASCIIPrintf(PETSC_VIEWER_STDOUT_WORLD, "\nLocal to global mapping\n"));
 71:   PetscCall(DMGetLocalToGlobalMapping(da, &is));
 72:   PetscCall(ISLocalToGlobalMappingView(is, PETSC_VIEWER_STDOUT_WORLD));

 74:   /* Free memory */
 75:   PetscCall(PetscViewerDestroy(&viewer));
 76:   PetscCall(VecDestroy(&global));
 77:   PetscCall(VecDestroy(&local));
 78:   PetscCall(DMDestroy(&da));
 79:   PetscCall(PetscFinalize());
 80:   return 0;
 81: }

 83: /*TEST

 85:    test:
 86:       nsize: 2
 87:       args: -nox
 88:       filter: grep -v " MPI process"
 89:       output_file: output/ex2_1.out
 90:       requires: x

 92:    test:
 93:       suffix: 2
 94:       nsize: 3
 95:       args: -wrap none -local_print -nox
 96:       filter: grep -v "Vec Object: Vec"
 97:       requires: x

 99:    test:
100:       suffix: 3
101:       nsize: 3
102:       args: -wrap ghosted -local_print -nox
103:       filter: grep -v "Vec Object: Vec"
104:       requires: x

106: TEST*/