1 static char help[] = "Orient a mesh in parallel\n\n"; 2 3 #include <petscdmplex.h> 4 5 typedef struct { 6 /* Domain and mesh definition */ 7 PetscBool testPartition; /* Use a fixed partitioning for testing */ 8 PetscInt testNum; /* Labels the different test partitions */ 9 } AppCtx; 10 11 static PetscErrorCode ProcessOptions(MPI_Comm comm, AppCtx *options) 12 { 13 PetscFunctionBeginUser; 14 options->testPartition = PETSC_TRUE; 15 options->testNum = 0; 16 17 PetscOptionsBegin(comm, "", "Meshing Problem Options", "DMPLEX"); 18 PetscCall(PetscOptionsBool("-test_partition", "Use a fixed partition for testing", "ex13.c", options->testPartition, &options->testPartition, NULL)); 19 PetscCall(PetscOptionsBoundedInt("-test_num", "The test partition number", "ex13.c", options->testNum, &options->testNum, NULL,0)); 20 PetscOptionsEnd(); 21 PetscFunctionReturn(0); 22 } 23 24 static PetscErrorCode CreateMesh(MPI_Comm comm, AppCtx *user, DM *dm) 25 { 26 DM dmDist = NULL; 27 PetscBool simplex; 28 PetscInt dim; 29 30 PetscFunctionBeginUser; 31 PetscCall(DMCreate(comm, dm)); 32 PetscCall(DMSetType(*dm, DMPLEX)); 33 PetscCall(DMPlexDistributeSetDefault(*dm, PETSC_FALSE)); 34 PetscCall(DMSetFromOptions(*dm)); 35 PetscCall(DMGetDimension(*dm, &dim)); 36 PetscCall(DMPlexIsSimplex(*dm, &simplex)); 37 if (user->testPartition) { 38 PetscPartitioner part; 39 PetscInt *sizes = NULL; 40 PetscInt *points = NULL; 41 PetscMPIInt rank, size; 42 43 PetscCallMPI(MPI_Comm_rank(comm, &rank)); 44 PetscCallMPI(MPI_Comm_size(comm, &size)); 45 if (rank == 0) { 46 if (dim == 2 && simplex && size == 2) { 47 switch (user->testNum) { 48 case 0: { 49 PetscInt triSizes_p2[2] = {4, 4}; 50 PetscInt triPoints_p2[8] = {3, 5, 6, 7, 0, 1, 2, 4}; 51 52 PetscCall(PetscMalloc2(2, &sizes, 8, &points)); 53 PetscCall(PetscArraycpy(sizes, triSizes_p2, 2)); 54 PetscCall(PetscArraycpy(points, triPoints_p2, 8)); 55 break;} 56 case 1: { 57 PetscInt triSizes_p2[2] = {6, 2}; 58 PetscInt triPoints_p2[8] = {1, 2, 3, 4, 6, 7, 0, 5}; 59 60 PetscCall(PetscMalloc2(2, &sizes, 8, &points)); 61 PetscCall(PetscArraycpy(sizes, triSizes_p2, 2)); 62 PetscCall(PetscArraycpy(points, triPoints_p2, 8)); 63 break;} 64 default: 65 SETERRQ(PETSC_COMM_WORLD, PETSC_ERR_ARG_WRONG, "Could not find matching test number %" PetscInt_FMT " for triangular mesh on 2 procs", user->testNum); 66 } 67 } else if (dim == 2 && simplex && size == 3) { 68 PetscInt triSizes_p3[3] = {3, 3, 2}; 69 PetscInt triPoints_p3[8] = {1, 2, 4, 3, 6, 7, 0, 5}; 70 71 PetscCall(PetscMalloc2(3, &sizes, 8, &points)); 72 PetscCall(PetscArraycpy(sizes, triSizes_p3, 3)); 73 PetscCall(PetscArraycpy(points, triPoints_p3, 8)); 74 } else if (dim == 2 && !simplex && size == 2) { 75 PetscInt quadSizes_p2[2] = {2, 2}; 76 PetscInt quadPoints_p2[4] = {2, 3, 0, 1}; 77 78 PetscCall(PetscMalloc2(2, &sizes, 4, &points)); 79 PetscCall(PetscArraycpy(sizes, quadSizes_p2, 2)); 80 PetscCall(PetscArraycpy(points, quadPoints_p2, 4)); 81 } else SETERRQ(PETSC_COMM_WORLD, PETSC_ERR_ARG_WRONG, "Could not find matching test partition"); 82 } 83 PetscCall(DMPlexGetPartitioner(*dm, &part)); 84 PetscCall(PetscPartitionerSetType(part, PETSCPARTITIONERSHELL)); 85 PetscCall(PetscPartitionerShellSetPartition(part, size, sizes, points)); 86 PetscCall(PetscFree2(sizes, points)); 87 } 88 PetscCall(DMPlexDistribute(*dm, 0, NULL, &dmDist)); 89 if (dmDist) { 90 PetscCall(DMDestroy(dm)); 91 *dm = dmDist; 92 } 93 PetscCall(PetscObjectSetName((PetscObject) *dm, simplex ? "Simplicial Mesh" : "Tensor Product Mesh")); 94 PetscCall(DMViewFromOptions(*dm, NULL, "-dm_view")); 95 PetscFunctionReturn(0); 96 } 97 98 static PetscErrorCode ScrambleOrientation(DM dm, AppCtx *user) 99 { 100 PetscInt h, cStart, cEnd, c; 101 102 PetscFunctionBeginUser; 103 PetscCall(DMPlexGetVTKCellHeight(dm, &h)); 104 PetscCall(DMPlexGetHeightStratum(dm, h, &cStart, &cEnd)); 105 for (c = cStart; c < cEnd; ++c) { 106 /* Could use PetscRand instead */ 107 if (c%2) PetscCall(DMPlexOrientPoint(dm, c, -1)); 108 } 109 PetscFunctionReturn(0); 110 } 111 112 static PetscErrorCode TestOrientation(DM dm, AppCtx *user) 113 { 114 PetscFunctionBeginUser; 115 PetscCall(ScrambleOrientation(dm, user)); 116 PetscCall(DMPlexOrient(dm)); 117 PetscCall(DMViewFromOptions(dm, NULL, "-oriented_dm_view")); 118 PetscFunctionReturn(0); 119 } 120 121 int main(int argc, char **argv) 122 { 123 DM dm; 124 AppCtx user; /* user-defined work context */ 125 126 PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 127 PetscCall(ProcessOptions(PETSC_COMM_WORLD, &user)); 128 PetscCall(CreateMesh(PETSC_COMM_WORLD, &user, &dm)); 129 PetscCall(TestOrientation(dm, &user)); 130 PetscCall(DMDestroy(&dm)); 131 PetscCall(PetscFinalize()); 132 return 0; 133 } 134 135 /*TEST 136 testset: 137 requires: triangle 138 args: -dm_coord_space 0 -dm_view ascii::ascii_info_detail -oriented_dm_view ascii::ascii_info_detail -orientation_view 139 140 test: 141 suffix: 0 142 args: -test_partition 0 143 test: 144 suffix: 1 145 nsize: 2 146 test: 147 suffix: 2 148 nsize: 2 149 args: -test_num 1 150 test: 151 suffix: 3 152 nsize: 3 153 args: -orientation_view_synchronized 154 155 TEST*/ 156