Actual source code: ex2.c


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

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

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

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

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

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

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

 44:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
 45:   value = rank + 1;
 46:   PetscCall(VecScale(global, value));

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

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

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

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

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

 82: /*TEST

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

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

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

105: TEST*/