1 static char help[] = "Partition a mesh in parallel, perhaps with overlap\n\n"; 2 3 #include <petscdmplex.h> 4 #include <petscsf.h> 5 6 /* Sample usage: 7 8 Load a file in serial and distribute it on 24 processes: 9 10 make -f ./gmakefile test search="dm_impls_plex_tests-ex12_0" EXTRA_OPTIONS="-filename $PETSC_DIR/share/petsc/datafiles/meshes/squaremotor-30.exo -orig_dm_view -dm_view" NP=24 11 12 Load a file in serial, distribute it, and then redistribute it on 24 processes using two different partitioners: 13 14 make -f ./gmakefile test search="dm_impls_plex_tests-ex12_0" EXTRA_OPTIONS="-filename $PETSC_DIR/share/petsc/datafiles/meshes/squaremotor-30.exo -petscpartitioner_type simple -load_balance -lb_petscpartitioner_type parmetis -orig_dm_view -dm_view" NP=24 15 16 Load a file in serial, distribute it randomly, refine it in parallel, and then redistribute it on 24 processes using two different partitioners, and view to VTK: 17 18 make -f ./gmakefile test search="dm_impls_plex_tests-ex12_0" EXTRA_OPTIONS="-filename $PETSC_DIR/share/petsc/datafiles/meshes/squaremotor-30.exo -petscpartitioner_type shell -petscpartitioner_shell_random -dm_refine 1 -load_balance -lb_petscpartitioner_type parmetis -prelb_dm_view vtk:$PWD/prelb.vtk -dm_view vtk:$PWD/balance.vtk -dm_partition_view" NP=24 19 20 */ 21 22 enum { 23 STAGE_LOAD, 24 STAGE_DISTRIBUTE, 25 STAGE_REFINE, 26 STAGE_REDISTRIBUTE 27 }; 28 29 typedef struct { 30 /* Domain and mesh definition */ 31 PetscInt overlap; /* The cell overlap to use during partitioning */ 32 PetscBool testPartition; /* Use a fixed partitioning for testing */ 33 PetscBool testRedundant; /* Use a redundant partitioning for testing */ 34 PetscBool loadBalance; /* Load balance via a second distribute step */ 35 PetscBool partitionBalance; /* Balance shared point partition */ 36 PetscLogStage stages[4]; 37 } AppCtx; 38 39 PetscErrorCode ProcessOptions(MPI_Comm comm, AppCtx *options) 40 { 41 PetscFunctionBegin; 42 options->overlap = 0; 43 options->testPartition = PETSC_FALSE; 44 options->testRedundant = PETSC_FALSE; 45 options->loadBalance = PETSC_FALSE; 46 options->partitionBalance = PETSC_FALSE; 47 48 PetscOptionsBegin(comm, "", "Meshing Problem Options", "DMPLEX"); 49 PetscCall(PetscOptionsBoundedInt("-overlap", "The cell overlap for partitioning", "ex12.c", options->overlap, &options->overlap, NULL, 0)); 50 PetscCall(PetscOptionsBool("-test_partition", "Use a fixed partition for testing", "ex12.c", options->testPartition, &options->testPartition, NULL)); 51 PetscCall(PetscOptionsBool("-test_redundant", "Use a redundant partition for testing", "ex12.c", options->testRedundant, &options->testRedundant, NULL)); 52 PetscCall(PetscOptionsBool("-load_balance", "Perform parallel load balancing in a second distribution step", "ex12.c", options->loadBalance, &options->loadBalance, NULL)); 53 PetscCall(PetscOptionsBool("-partition_balance", "Balance the ownership of shared points", "ex12.c", options->partitionBalance, &options->partitionBalance, NULL)); 54 PetscOptionsEnd(); 55 56 PetscCall(PetscLogStageRegister("MeshLoad", &options->stages[STAGE_LOAD])); 57 PetscCall(PetscLogStageRegister("MeshDistribute", &options->stages[STAGE_DISTRIBUTE])); 58 PetscCall(PetscLogStageRegister("MeshRefine", &options->stages[STAGE_REFINE])); 59 PetscCall(PetscLogStageRegister("MeshRedistribute", &options->stages[STAGE_REDISTRIBUTE])); 60 PetscFunctionReturn(PETSC_SUCCESS); 61 } 62 63 PetscErrorCode CreateMesh(MPI_Comm comm, AppCtx *user, DM *dm) 64 { 65 DM pdm = NULL; 66 PetscInt triSizes_n2[2] = {4, 4}; 67 PetscInt triPoints_n2[8] = {0, 1, 4, 6, 2, 3, 5, 7}; 68 PetscInt triSizes_n3[3] = {3, 2, 3}; 69 PetscInt triPoints_n3[8] = {3, 5, 6, 1, 7, 0, 2, 4}; 70 PetscInt triSizes_n4[4] = {2, 2, 2, 2}; 71 PetscInt triPoints_n4[8] = {0, 7, 1, 5, 2, 3, 4, 6}; 72 PetscInt triSizes_n8[8] = {1, 1, 1, 1, 1, 1, 1, 1}; 73 PetscInt triPoints_n8[8] = {0, 1, 2, 3, 4, 5, 6, 7}; 74 PetscInt quadSizes[2] = {2, 2}; 75 PetscInt quadPoints[4] = {2, 3, 0, 1}; 76 PetscInt overlap = user->overlap >= 0 ? user->overlap : 0; 77 PetscInt dim; 78 PetscBool simplex; 79 PetscMPIInt rank, size; 80 81 PetscFunctionBegin; 82 PetscCallMPI(MPI_Comm_rank(comm, &rank)); 83 PetscCallMPI(MPI_Comm_size(comm, &size)); 84 PetscCall(PetscLogStagePush(user->stages[STAGE_LOAD])); 85 PetscCall(DMCreate(comm, dm)); 86 PetscCall(DMSetType(*dm, DMPLEX)); 87 PetscCall(DMPlexDistributeSetDefault(*dm, PETSC_FALSE)); 88 PetscCall(DMSetFromOptions(*dm)); 89 PetscCall(DMViewFromOptions(*dm, NULL, "-orig_dm_view")); 90 PetscCall(PetscLogStagePop()); 91 PetscCall(DMGetDimension(*dm, &dim)); 92 PetscCall(DMPlexIsSimplex(*dm, &simplex)); 93 PetscCall(PetscLogStagePush(user->stages[STAGE_DISTRIBUTE])); 94 if (!user->testRedundant) { 95 PetscPartitioner part; 96 97 PetscCall(DMPlexGetPartitioner(*dm, &part)); 98 PetscCall(PetscPartitionerSetFromOptions(part)); 99 PetscCall(DMPlexSetPartitionBalance(*dm, user->partitionBalance)); 100 if (user->testPartition) { 101 const PetscInt *sizes = NULL; 102 const PetscInt *points = NULL; 103 104 if (rank == 0) { 105 if (dim == 2 && simplex && size == 2) { 106 sizes = triSizes_n2; 107 points = triPoints_n2; 108 } else if (dim == 2 && simplex && size == 3) { 109 sizes = triSizes_n3; 110 points = triPoints_n3; 111 } else if (dim == 2 && simplex && size == 4) { 112 sizes = triSizes_n4; 113 points = triPoints_n4; 114 } else if (dim == 2 && simplex && size == 8) { 115 sizes = triSizes_n8; 116 points = triPoints_n8; 117 } else if (dim == 2 && !simplex && size == 2) { 118 sizes = quadSizes; 119 points = quadPoints; 120 } 121 } 122 PetscCall(PetscPartitionerSetType(part, PETSCPARTITIONERSHELL)); 123 PetscCall(PetscPartitionerShellSetPartition(part, size, sizes, points)); 124 } 125 PetscCall(DMPlexDistribute(*dm, overlap, NULL, &pdm)); 126 } else { 127 PetscSF sf; 128 129 PetscCall(DMPlexGetRedundantDM(*dm, &sf, &pdm)); 130 if (sf) { 131 DM test; 132 133 PetscCall(DMPlexCreate(comm, &test)); 134 PetscCall(PetscObjectSetName((PetscObject)test, "Test SF-migrated Redundant Mesh")); 135 PetscCall(DMPlexMigrate(*dm, sf, test)); 136 PetscCall(DMViewFromOptions(test, NULL, "-redundant_migrated_dm_view")); 137 PetscCall(DMDestroy(&test)); 138 } 139 PetscCall(PetscSFDestroy(&sf)); 140 } 141 if (pdm) { 142 PetscCall(DMDestroy(dm)); 143 *dm = pdm; 144 } 145 PetscCall(PetscLogStagePop()); 146 PetscCall(DMSetFromOptions(*dm)); 147 if (user->loadBalance) { 148 PetscPartitioner part; 149 150 PetscCall(DMViewFromOptions(*dm, NULL, "-prelb_dm_view")); 151 PetscCall(DMPlexSetOptionsPrefix(*dm, "lb_")); 152 PetscCall(PetscLogStagePush(user->stages[STAGE_REDISTRIBUTE])); 153 PetscCall(DMPlexGetPartitioner(*dm, &part)); 154 PetscCall(PetscObjectSetOptionsPrefix((PetscObject)part, "lb_")); 155 PetscCall(PetscPartitionerSetFromOptions(part)); 156 if (user->testPartition) { 157 PetscInt reSizes_n2[2] = {2, 2}; 158 PetscInt rePoints_n2[4] = {2, 3, 0, 1}; 159 if (rank) { 160 rePoints_n2[0] = 1; 161 rePoints_n2[1] = 2, rePoints_n2[2] = 0, rePoints_n2[3] = 3; 162 } 163 164 PetscCall(PetscPartitionerSetType(part, PETSCPARTITIONERSHELL)); 165 PetscCall(PetscPartitionerShellSetPartition(part, size, reSizes_n2, rePoints_n2)); 166 } 167 PetscCall(DMPlexSetPartitionBalance(*dm, user->partitionBalance)); 168 PetscCall(DMPlexDistribute(*dm, overlap, NULL, &pdm)); 169 if (pdm) { 170 PetscCall(DMDestroy(dm)); 171 *dm = pdm; 172 } 173 PetscCall(PetscLogStagePop()); 174 } 175 PetscCall(PetscLogStagePush(user->stages[STAGE_REFINE])); 176 PetscCall(DMViewFromOptions(*dm, NULL, "-dm_view")); 177 PetscCall(PetscLogStagePop()); 178 PetscFunctionReturn(PETSC_SUCCESS); 179 } 180 181 int main(int argc, char **argv) 182 { 183 DM dm; 184 AppCtx user; /* user-defined work context */ 185 186 PetscFunctionBeginUser; 187 PetscCall(PetscInitialize(&argc, &argv, NULL, help)); 188 PetscCall(ProcessOptions(PETSC_COMM_WORLD, &user)); 189 PetscCall(CreateMesh(PETSC_COMM_WORLD, &user, &dm)); 190 PetscCall(DMDestroy(&dm)); 191 PetscCall(PetscFinalize()); 192 return 0; 193 } 194 195 /*TEST 196 # Parallel, no overlap tests 0-2 197 test: 198 suffix: 0 199 requires: triangle 200 args: -dm_coord_space 0 -dm_view ascii:mesh.tex:ascii_latex 201 output_file: output/empty.out 202 test: 203 suffix: 1 204 requires: triangle 205 nsize: 3 206 args: -dm_coord_space 0 -test_partition -dm_view ascii::ascii_info_detail 207 test: 208 suffix: 2 209 requires: triangle 210 nsize: 8 211 args: -dm_coord_space 0 -test_partition -dm_view ascii::ascii_info_detail 212 # Parallel, level-1 overlap tests 3-4 213 test: 214 suffix: 3 215 requires: triangle 216 nsize: 3 217 args: -dm_coord_space 0 -test_partition -overlap 1 -dm_view ascii::ascii_info_detail 218 test: 219 suffix: 4 220 requires: triangle 221 nsize: 8 222 args: -dm_coord_space 0 -test_partition -overlap 1 -dm_view ascii::ascii_info_detail 223 # Parallel, level-2 overlap test 5 224 test: 225 suffix: 5 226 requires: triangle 227 nsize: 8 228 args: -dm_coord_space 0 -test_partition -overlap 2 -dm_view ascii::ascii_info_detail 229 # Parallel load balancing, test 6-7 230 test: 231 suffix: 6 232 requires: triangle 233 nsize: 2 234 args: -dm_coord_space 0 -test_partition -overlap 1 -dm_view ascii::ascii_info_detail 235 test: 236 suffix: 7 237 requires: triangle 238 nsize: 2 239 args: -dm_coord_space 0 -test_partition -overlap 1 -load_balance -dm_view ascii::ascii_info_detail 240 # Parallel redundant copying, test 8 241 test: 242 suffix: 8 243 requires: triangle 244 nsize: 2 245 args: -dm_coord_space 0 -test_redundant -redundant_migrated_dm_view ascii::ascii_info_detail -dm_view ascii::ascii_info_detail 246 test: 247 suffix: lb_0 248 requires: parmetis 249 nsize: 4 250 args: -dm_coord_space 0 -dm_plex_simplex 0 -dm_plex_box_faces 4,4 -petscpartitioner_type shell -petscpartitioner_shell_random -lb_petscpartitioner_type parmetis -load_balance -lb_petscpartitioner_view -prelb_dm_view ::load_balance -dm_view ::load_balance 251 252 # Same tests as above, but with balancing of the shared point partition 253 test: 254 suffix: 9 255 requires: triangle 256 args: -dm_coord_space 0 -dm_view ascii:mesh.tex:ascii_latex -partition_balance 257 output_file: output/empty.out 258 test: 259 suffix: 10 260 requires: triangle 261 nsize: 3 262 args: -dm_coord_space 0 -test_partition -dm_view ascii::ascii_info_detail -partition_balance 263 test: 264 suffix: 11 265 requires: triangle 266 nsize: 8 267 args: -dm_coord_space 0 -test_partition -dm_view ascii::ascii_info_detail -partition_balance 268 # Parallel, level-1 overlap tests 3-4 269 test: 270 suffix: 12 271 requires: triangle 272 nsize: 3 273 args: -dm_coord_space 0 -test_partition -overlap 1 -dm_view ascii::ascii_info_detail -partition_balance 274 test: 275 suffix: 13 276 requires: triangle 277 nsize: 8 278 args: -dm_coord_space 0 -test_partition -overlap 1 -dm_view ascii::ascii_info_detail -partition_balance 279 # Parallel, level-2 overlap test 5 280 test: 281 suffix: 14 282 requires: triangle 283 nsize: 8 284 args: -dm_coord_space 0 -test_partition -overlap 2 -dm_view ascii::ascii_info_detail -partition_balance 285 # Parallel load balancing, test 6-7 286 test: 287 suffix: 15 288 requires: triangle 289 nsize: 2 290 args: -dm_coord_space 0 -test_partition -overlap 1 -dm_view ascii::ascii_info_detail -partition_balance 291 test: 292 suffix: 16 293 requires: triangle 294 nsize: 2 295 args: -dm_coord_space 0 -test_partition -overlap 1 -load_balance -dm_view ascii::ascii_info_detail -partition_balance 296 # Parallel redundant copying, test 8 297 test: 298 suffix: 17 299 requires: triangle 300 nsize: 2 301 args: -dm_coord_space 0 -test_redundant -dm_view ascii::ascii_info_detail -partition_balance 302 test: 303 suffix: lb_1 304 requires: parmetis 305 nsize: 4 306 args: -dm_coord_space 0 -dm_plex_simplex 0 -dm_plex_box_faces 4,4 -petscpartitioner_type shell -petscpartitioner_shell_random -lb_petscpartitioner_type parmetis -load_balance -lb_petscpartitioner_view -partition_balance -prelb_dm_view ::load_balance -dm_view ::load_balance 307 TEST*/ 308