1 static char help[] = "An example of writing a global Vec from a DMPlex with HDF5 format.\n"; 2 3 #include <petscdmplex.h> 4 #include <petscviewerhdf5.h> 5 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 numFields = 1; 14 PetscInt numBC = 0; 15 PetscInt numComp[1] = {2}; 16 PetscInt numDof[3] = {2, 0, 0}; 17 PetscInt bcFields[1] = {0}; 18 IS bcPoints[1] = {NULL}; 19 PetscSection section; 20 PetscReal norm; 21 PetscInt dim; 22 23 PetscFunctionBeginUser; 24 PetscCall(PetscInitialize(&argc, &argv, (char *)0, help)); 25 comm = PETSC_COMM_WORLD; 26 27 PetscOptionsBegin(PETSC_COMM_WORLD, "", "Test Options", "none"); 28 PetscCall(PetscOptionsBool("-test_read", "Test reading from the HDF5 file", "", PETSC_FALSE, &test_read, NULL)); 29 PetscCall(PetscOptionsBool("-verbose", "print the Vecs", "", PETSC_FALSE, &verbose, NULL)); 30 PetscOptionsEnd(); 31 32 PetscCall(DMCreate(comm, &dm)); 33 PetscCall(DMSetType(dm, DMPLEX)); 34 PetscCall(DMPlexDistributeSetDefault(dm, PETSC_FALSE)); 35 PetscCall(DMSetFromOptions(dm)); 36 PetscCall(DMViewFromOptions(dm, NULL, "-dm_view")); 37 PetscCall(DMGetDimension(dm, &dim)); 38 numDof[0] = dim; 39 PetscCall(DMSetNumFields(dm, numFields)); 40 PetscCall(DMPlexCreateSection(dm, NULL, numComp, numDof, numBC, bcFields, bcPoints, NULL, NULL, §ion)); 41 PetscCall(DMSetLocalSection(dm, section)); 42 PetscCall(PetscSectionDestroy(§ion)); 43 PetscCall(DMSetUseNatural(dm, PETSC_TRUE)); 44 { 45 PetscPartitioner part; 46 DM dmDist; 47 48 PetscCall(DMPlexGetPartitioner(dm, &part)); 49 PetscCall(PetscPartitionerSetFromOptions(part)); 50 PetscCall(DMPlexDistribute(dm, 0, NULL, &dmDist)); 51 if (dmDist) { 52 PetscCall(DMDestroy(&dm)); 53 dm = dmDist; 54 } 55 } 56 57 PetscCall(DMCreateGlobalVector(dm, &v)); 58 PetscCall(PetscObjectSetName((PetscObject)v, "V")); 59 PetscCall(DMGetCoordinates(dm, &coord)); 60 PetscCall(VecCopy(coord, v)); 61 62 if (verbose) { 63 PetscInt size, bs; 64 65 PetscCall(VecGetSize(v, &size)); 66 PetscCall(VecGetBlockSize(v, &bs)); 67 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "==== original V in global ordering. size==%d\tblock size=%d\n", size, bs)); 68 PetscCall(VecView(v, PETSC_VIEWER_STDOUT_WORLD)); 69 } 70 71 PetscCall(DMPlexCreateNaturalVector(dm, &nv)); 72 PetscCall(PetscObjectSetName((PetscObject)nv, "NV")); 73 PetscCall(DMPlexGlobalToNaturalBegin(dm, v, nv)); 74 PetscCall(DMPlexGlobalToNaturalEnd(dm, v, nv)); 75 76 if (verbose) { 77 PetscInt size, bs; 78 79 PetscCall(VecGetSize(nv, &size)); 80 PetscCall(VecGetBlockSize(nv, &bs)); 81 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "==== V in natural ordering. size==%d\tblock size=%d\n", size, bs)); 82 PetscCall(VecView(nv, PETSC_VIEWER_STDOUT_WORLD)); 83 } 84 85 PetscCall(VecViewFromOptions(v, NULL, "-global_vec_view")); 86 87 if (test_read) { 88 PetscCall(DMCreateGlobalVector(dm, &rv)); 89 PetscCall(PetscObjectSetName((PetscObject)rv, "V")); 90 /* Test native read */ 91 PetscCall(PetscViewerHDF5Open(comm, "V.h5", FILE_MODE_READ, &hdf5Viewer)); 92 PetscCall(PetscViewerPushFormat(hdf5Viewer, PETSC_VIEWER_NATIVE)); 93 PetscCall(VecLoad(rv, hdf5Viewer)); 94 PetscCall(PetscViewerPopFormat(hdf5Viewer)); 95 PetscCall(PetscViewerDestroy(&hdf5Viewer)); 96 if (verbose) { 97 PetscInt size, bs; 98 99 PetscCall(VecGetSize(rv, &size)); 100 PetscCall(VecGetBlockSize(rv, &bs)); 101 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "==== Vector from file. size==%d\tblock size=%d\n", size, bs)); 102 PetscCall(VecView(rv, PETSC_VIEWER_STDOUT_WORLD)); 103 } 104 PetscCall(VecEqual(rv, v, &flg)); 105 if (flg) { 106 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "V and RV are equal\n")); 107 } else { 108 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "V and RV are not equal\n\n")); 109 PetscCall(VecAXPY(rv, -1.0, v)); 110 PetscCall(VecNorm(rv, NORM_INFINITY, &norm)); 111 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "diff norm is = %g\n", (double)norm)); 112 PetscCall(VecView(rv, PETSC_VIEWER_STDOUT_WORLD)); 113 } 114 /* Test raw read */ 115 PetscCall(PetscViewerHDF5Open(comm, "V.h5", FILE_MODE_READ, &hdf5Viewer)); 116 PetscCall(VecLoad(rv, hdf5Viewer)); 117 PetscCall(PetscViewerDestroy(&hdf5Viewer)); 118 if (verbose) { 119 PetscInt size, bs; 120 121 PetscCall(VecGetSize(rv, &size)); 122 PetscCall(VecGetBlockSize(rv, &bs)); 123 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "==== Vector from file. size==%d\tblock size=%d\n", size, bs)); 124 PetscCall(VecView(rv, PETSC_VIEWER_STDOUT_WORLD)); 125 } 126 PetscCall(VecEqual(rv, nv, &flg)); 127 if (flg) { 128 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "NV and RV are equal\n")); 129 } else { 130 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "NV and RV are not equal\n\n")); 131 PetscCall(VecAXPY(rv, -1.0, v)); 132 PetscCall(VecNorm(rv, NORM_INFINITY, &norm)); 133 PetscCall(PetscPrintf(PETSC_COMM_WORLD, "diff norm is = %g\n", (double)norm)); 134 PetscCall(VecView(rv, PETSC_VIEWER_STDOUT_WORLD)); 135 } 136 PetscCall(VecDestroy(&rv)); 137 } 138 PetscCall(VecDestroy(&nv)); 139 PetscCall(VecDestroy(&v)); 140 PetscCall(DMDestroy(&dm)); 141 PetscCall(PetscFinalize()); 142 return 0; 143 } 144 145 /*TEST 146 build: 147 requires: triangle hdf5 148 test: 149 suffix: 0 150 requires: triangle hdf5 151 nsize: 2 152 args: -petscpartitioner_type simple -verbose -globaltonatural_sf_view 153 test: 154 suffix: 1 155 requires: triangle hdf5 156 nsize: 2 157 args: -petscpartitioner_type simple -verbose -global_vec_view hdf5:V.h5:native -test_read 158 159 TEST*/ 160