1: static char help[] = "An example of writing a global Vec from a DMPlex with HDF5 format.\n";

  3:  #include <petscdmplex.h>
  4: #include <petscviewerhdf5.h>

  6: int main(int argc, char **argv)
  7: {
  8:   MPI_Comm       comm;
  9:   DM             dm;
 10:   Vec            v, nv, rv, coord;
 11:   PetscBool      test_read = PETSC_FALSE, verbose = PETSC_FALSE, flg;
 12:   PetscViewer    hdf5Viewer;
 13:   PetscInt       dim         = 2;
 14:   PetscInt       numFields   = 1;
 15:   PetscInt       numBC       = 0;
 16:   PetscInt       numComp[1]  = {2};
 17:   PetscInt       numDof[3]   = {2, 0, 0};
 18:   PetscInt       bcFields[1] = {0};
 19:   IS             bcPoints[1] = {NULL};
 20:   PetscSection   section;
 21:   PetscReal      norm;

 24:   PetscInitialize(&argc, &argv, (char *) 0, help);if (ierr) return ierr;
 25:   comm = PETSC_COMM_WORLD;

 27:   PetscOptionsBegin(PETSC_COMM_WORLD,"","Test Options","none");
 28:   PetscOptionsBool("-test_read","Test reading from the HDF5 file","",PETSC_FALSE,&test_read,NULL);
 29:   PetscOptionsBool("-verbose","print the Vecs","",PETSC_FALSE,&verbose,NULL);
 30:   PetscOptionsInt("-dim","the dimension of the problem","",2,&dim,NULL);
 31:   PetscOptionsEnd();

 33:   DMPlexCreateBoxMesh(comm, dim, PETSC_TRUE, NULL, NULL, NULL, NULL, PETSC_TRUE, &dm);
 34:   DMGetDimension(dm, &dim);
 35:   numDof[0] = dim;
 36:   DMPlexCreateSection(dm, dim, numFields, numComp, numDof, numBC, bcFields, bcPoints, NULL, NULL, &section);
 37:   DMSetDefaultSection(dm, section);
 38:   PetscSectionDestroy(&section);
 39:   DMSetUseNatural(dm, PETSC_TRUE);
 40:   {
 41:     PetscPartitioner part;
 42:     DM               dmDist;

 44:     DMPlexGetPartitioner(dm,&part);
 45:     PetscPartitionerSetFromOptions(part);
 46:     DMPlexDistribute(dm, 0, NULL, &dmDist);
 47:     if (dmDist) {
 48:       DMDestroy(&dm);
 49:       dm   = dmDist;
 50:     }
 51:   }

 53:   DMCreateGlobalVector(dm, &v);
 54:   PetscObjectSetName((PetscObject) v, "V");
 55:   DMGetCoordinates(dm, &coord);
 56:   VecCopy(coord, v);

 58:   if (verbose) {
 59:     PetscInt size, bs;

 61:     VecGetSize(v, &size);
 62:     VecGetBlockSize(v, &bs);
 63:     PetscPrintf(PETSC_COMM_WORLD, "==== original V in global ordering. size==%d\tblock size=%d\n", size, bs);
 64:     VecView(v, PETSC_VIEWER_STDOUT_WORLD);
 65:   }

 67:   DMCreateGlobalVector(dm, &nv);
 68:   PetscObjectSetName((PetscObject) nv, "NV");
 69:   DMPlexGlobalToNaturalBegin(dm, v, nv);
 70:   DMPlexGlobalToNaturalEnd(dm, v, nv);

 72:   if (verbose) {
 73:     PetscInt size, bs;

 75:     VecGetSize(nv, &size);
 76:     VecGetBlockSize(nv, &bs);
 77:     PetscPrintf(PETSC_COMM_WORLD, "====  V in natural ordering. size==%d\tblock size=%d\n", size, bs);
 78:     VecView(nv, PETSC_VIEWER_STDOUT_WORLD);
 79:   }

 81:   VecViewFromOptions(v, NULL, "-global_vec_view");

 83:   if (test_read) {
 84:     DMCreateGlobalVector(dm, &rv);
 85:     PetscObjectSetName((PetscObject) rv, "V");
 86:     /* Test native read */
 87:     PetscViewerHDF5Open(comm, "V.h5", FILE_MODE_READ, &hdf5Viewer);
 88:     PetscViewerPushFormat(hdf5Viewer, PETSC_VIEWER_NATIVE);
 89:     VecLoad(rv, hdf5Viewer);
 90:     PetscViewerPopFormat(hdf5Viewer);
 91:     PetscViewerDestroy(&hdf5Viewer);
 92:     if (verbose) {
 93:       PetscInt size, bs;

 95:       VecGetSize(rv, &size);
 96:       VecGetBlockSize(rv, &bs);
 97:       PetscPrintf(PETSC_COMM_WORLD, "==== Vector from file. size==%d\tblock size=%d\n", size, bs);
 98:       VecView(rv, PETSC_VIEWER_STDOUT_WORLD);
 99:     }
100:     VecEqual(rv, v, &flg);
101:     if (flg) {
102:       PetscPrintf(PETSC_COMM_WORLD, "V and RV are equal\n");
103:     } else {
104:       PetscPrintf(PETSC_COMM_WORLD, "V and RV are not equal\n\n");
105:       VecAXPY(rv, -1.0, v);
106:       VecNorm(rv, NORM_INFINITY, &norm);
107:       PetscPrintf(PETSC_COMM_WORLD, "diff norm is = %g\n", (double) norm);
108:       VecView(rv, PETSC_VIEWER_STDOUT_WORLD);
109:     }
110:     /* Test raw read */
111:     PetscViewerHDF5Open(comm, "V.h5", FILE_MODE_READ, &hdf5Viewer);
112:     VecLoad(rv, hdf5Viewer);
113:     PetscViewerDestroy(&hdf5Viewer);
114:     if (verbose) {
115:       PetscInt size, bs;

117:       VecGetSize(rv, &size);
118:       VecGetBlockSize(rv, &bs);
119:       PetscPrintf(PETSC_COMM_WORLD, "==== Vector from file. size==%d\tblock size=%d\n", size, bs);
120:       VecView(rv, PETSC_VIEWER_STDOUT_WORLD);
121:     }
122:     VecEqual(rv, nv, &flg);
123:     if (flg) {
124:       PetscPrintf(PETSC_COMM_WORLD, "NV and RV are equal\n");
125:     } else {
126:       PetscPrintf(PETSC_COMM_WORLD, "NV and RV are not equal\n\n");
127:       VecAXPY(rv, -1.0, v);
128:       VecNorm(rv, NORM_INFINITY, &norm);
129:       PetscPrintf(PETSC_COMM_WORLD, "diff norm is = %g\n", (double) norm);
130:       VecView(rv, PETSC_VIEWER_STDOUT_WORLD);
131:     }
132:     VecDestroy(&rv);
133:   }
134:   VecDestroy(&nv);
135:   VecDestroy(&v);
136:   DMDestroy(&dm);
137:   PetscFinalize();
138:   return ierr;
139: }

141: /*TEST
142:   build:
143:     requires: triangle hdf5
144:   test:
145:     suffix: 0
146:     requires: triangle hdf5
147:     nsize: 2
148:     args: -petscpartitioner_type simple -verbose -globaltonatural_sf_view
149:   test:
150:     suffix: 1
151:     requires: triangle hdf5
152:     nsize: 2
153:     args: -petscpartitioner_type simple -verbose -global_vec_view hdf5:V.h5:native -test_read

155: TEST*/