1: static char help[] = "Demonstrates HDF5 vector input/output\n\n";

  3: #include <petscsys.h>
  4: #include <petscdm.h>
  5: #include <petscdmda.h>
  6: #include <petscviewerhdf5.h>

  8: int main(int argc, char **argv)
  9: {
 10:   PetscViewer viewer;
 11:   DM          da;
 12:   Vec         global, local, global2;
 13:   PetscMPIInt rank;
 14:   PetscBool   flg;
 15:   PetscInt    ndof;

 17:   /*
 18:     Every PETSc routine should begin with the PetscInitialize() routine.
 19:     argc, argv - These command line arguments are taken to extract the options
 20:                  supplied to PETSc and options supplied to MPI.
 21:     help       - When PETSc executable is invoked with the option -help,
 22:                  it prints the various options that can be applied at
 23:                  runtime.  The user can use the "help" variable place
 24:                  additional help messages in this printout.
 25:   */
 26:   PetscFunctionBeginUser;
 27:   PetscCall(PetscInitialize(&argc, &argv, NULL, help));
 28:   /* Get number of DOF's from command line */
 29:   PetscOptionsBegin(PETSC_COMM_WORLD, NULL, "DMDA VecView/VecLoad example", "");
 30:   {
 31:     ndof = 1;
 32:     PetscCall(PetscOptionsBoundedInt("-ndof", "Number of DOF's in DMDA", "", ndof, &ndof, NULL, 1));
 33:   }
 34:   PetscOptionsEnd();

 36:   /* Create a DMDA and an associated vector */
 37:   PetscCall(DMDACreate2d(PETSC_COMM_WORLD, DM_BOUNDARY_NONE, DM_BOUNDARY_NONE, DMDA_STENCIL_BOX, 100, 90, PETSC_DECIDE, PETSC_DECIDE, ndof, 1, NULL, NULL, &da));
 38:   PetscCall(DMSetFromOptions(da));
 39:   PetscCall(DMSetUp(da));
 40:   PetscCall(DMCreateGlobalVector(da, &global));
 41:   PetscCall(DMCreateLocalVector(da, &local));
 42:   PetscCall(VecSet(global, -1.0));
 43:   PetscCall(DMGlobalToLocalBegin(da, global, INSERT_VALUES, local));
 44:   PetscCall(DMGlobalToLocalEnd(da, global, INSERT_VALUES, local));
 45:   PetscCallMPI(MPI_Comm_rank(PETSC_COMM_WORLD, &rank));
 46:   PetscCall(VecScale(local, rank + 1));
 47:   PetscCall(DMLocalToGlobalBegin(da, local, ADD_VALUES, global));
 48:   PetscCall(DMLocalToGlobalEnd(da, local, ADD_VALUES, global));

 50:   /* Create the HDF5 viewer for writing */
 51:   PetscCall(PetscViewerHDF5Open(PETSC_COMM_WORLD, "hdf5output.h5", FILE_MODE_WRITE, &viewer));
 52:   PetscCall(PetscViewerSetFromOptions(viewer));

 54:   /* Write the Vec without one extra dimension for BS */
 55:   PetscCall(PetscViewerHDF5SetBaseDimension2(viewer, PETSC_FALSE));
 56:   PetscCall(PetscObjectSetName((PetscObject)global, "noBsDim"));
 57:   PetscCall(VecView(global, viewer));

 59:   /* Write the Vec with one extra, 1-sized, dimension for BS */
 60:   PetscCall(PetscViewerHDF5SetBaseDimension2(viewer, PETSC_TRUE));
 61:   PetscCall(PetscObjectSetName((PetscObject)global, "bsDim"));
 62:   PetscCall(VecView(global, viewer));

 64:   PetscCall(PetscViewerDestroy(&viewer));
 65:   PetscCallMPI(MPI_Barrier(PETSC_COMM_WORLD));
 66:   PetscCall(VecDuplicate(global, &global2));

 68:   /* Create the HDF5 viewer for reading */
 69:   PetscCall(PetscViewerHDF5Open(PETSC_COMM_WORLD, "hdf5output.h5", FILE_MODE_READ, &viewer));
 70:   PetscCall(PetscViewerSetFromOptions(viewer));

 72:   /* Load the Vec without the BS dim and compare */
 73:   PetscCall(PetscObjectSetName((PetscObject)global2, "noBsDim"));
 74:   PetscCall(VecLoad(global2, viewer));

 76:   PetscCall(VecEqual(global, global2, &flg));
 77:   if (!flg) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Error: Vectors are not equal\n"));

 79:   /* Load the Vec with one extra, 1-sized, BS dim and compare */
 80:   PetscCall(PetscObjectSetName((PetscObject)global2, "bsDim"));
 81:   PetscCall(VecLoad(global2, viewer));
 82:   PetscCall(PetscViewerDestroy(&viewer));

 84:   PetscCall(VecEqual(global, global2, &flg));
 85:   if (!flg) PetscCall(PetscPrintf(PETSC_COMM_WORLD, "Error: Vectors are not equal\n"));

 87:   /* clean up and exit */
 88:   PetscCall(VecDestroy(&local));
 89:   PetscCall(VecDestroy(&global));
 90:   PetscCall(VecDestroy(&global2));
 91:   PetscCall(DMDestroy(&da));

 93:   PetscCall(PetscFinalize());
 94:   return 0;
 95: }

 97: /*TEST

 99:       build:
100:          requires: hdf5

102:       test:
103:          nsize: 4

105:       test:
106:          nsize: 4
107:          suffix: 2
108:          args: -ndof 2
109:          output_file: output/ex9_1.out

111: TEST*/