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