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:   PetscOptionsRangeInt("-dim","the dimension of the problem","",2,&dim,NULL,1,3);
 31:   PetscOptionsEnd();

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

 45:     DMPlexGetPartitioner(dm,&part);
 46:     PetscPartitionerSetFromOptions(part);
 47:     DMPlexDistribute(dm, 0, NULL, &dmDist);
 48:     if (dmDist) {
 49:       DMDestroy(&dm);
 50:       dm   = dmDist;
 51:     }
 52:   }

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

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

 62:     VecGetSize(v, &size);
 63:     VecGetBlockSize(v, &bs);
 64:     PetscPrintf(PETSC_COMM_WORLD, "==== original V in global ordering. size==%d\tblock size=%d\n", size, bs);
 65:     VecView(v, PETSC_VIEWER_STDOUT_WORLD);
 66:   }

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

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

 76:     VecGetSize(nv, &size);
 77:     VecGetBlockSize(nv, &bs);
 78:     PetscPrintf(PETSC_COMM_WORLD, "====  V in natural ordering. size==%d\tblock size=%d\n", size, bs);
 79:     VecView(nv, PETSC_VIEWER_STDOUT_WORLD);
 80:   }

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

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

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

118:       VecGetSize(rv, &size);
119:       VecGetBlockSize(rv, &bs);
120:       PetscPrintf(PETSC_COMM_WORLD, "==== Vector from file. size==%d\tblock size=%d\n", size, bs);
121:       VecView(rv, PETSC_VIEWER_STDOUT_WORLD);
122:     }
123:     VecEqual(rv, nv, &flg);
124:     if (flg) {
125:       PetscPrintf(PETSC_COMM_WORLD, "NV and RV are equal\n");
126:     } else {
127:       PetscPrintf(PETSC_COMM_WORLD, "NV and RV are not equal\n\n");
128:       VecAXPY(rv, -1.0, v);
129:       VecNorm(rv, NORM_INFINITY, &norm);
130:       PetscPrintf(PETSC_COMM_WORLD, "diff norm is = %g\n", (double) norm);
131:       VecView(rv, PETSC_VIEWER_STDOUT_WORLD);
132:     }
133:     VecDestroy(&rv);
134:   }
135:   VecDestroy(&nv);
136:   VecDestroy(&v);
137:   DMDestroy(&dm);
138:   PetscFinalize();
139:   return ierr;
140: }

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

156: TEST*/