1 #include <petsc/private/dmimpl.h> /*I "petscdm.h" I*/ 2 #include <petscds.h> 3 4 PetscErrorCode DMCreateGlobalVector_Section_Private(DM dm,Vec *vec) 5 { 6 PetscSection gSection; 7 PetscInt localSize, bs, blockSize = -1, pStart, pEnd, p; 8 PetscErrorCode ierr; 9 PetscInt in[2],out[2]; 10 11 PetscFunctionBegin; 12 ierr = DMGetGlobalSection(dm, &gSection);CHKERRQ(ierr); 13 ierr = PetscSectionGetChart(gSection, &pStart, &pEnd);CHKERRQ(ierr); 14 for (p = pStart; p < pEnd; ++p) { 15 PetscInt dof, cdof; 16 17 ierr = PetscSectionGetDof(gSection, p, &dof);CHKERRQ(ierr); 18 ierr = PetscSectionGetConstraintDof(gSection, p, &cdof);CHKERRQ(ierr); 19 20 if (dof > 0) { 21 if (blockSize < 0 && dof-cdof > 0) { 22 /* set blockSize */ 23 blockSize = dof-cdof; 24 } else if (dof-cdof != blockSize) { 25 /* non-identical blockSize, set it as 1 */ 26 blockSize = 1; 27 break; 28 } 29 } 30 } 31 32 in[0] = blockSize < 0 ? PETSC_MIN_INT : -blockSize; 33 in[1] = blockSize; 34 ierr = MPIU_Allreduce(in,out,2,MPIU_INT,MPI_MAX,PetscObjectComm((PetscObject)dm));CHKERRQ(ierr); 35 /* -out[0] = min(blockSize), out[1] = max(blockSize) */ 36 if (-out[0] == out[1]) { 37 bs = out[1]; 38 } else bs = 1; 39 40 if (bs < 0) { /* Everyone was empty */ 41 blockSize = 1; 42 bs = 1; 43 } 44 45 ierr = PetscSectionGetConstrainedStorageSize(gSection, &localSize);CHKERRQ(ierr); 46 if (localSize%blockSize) SETERRQ2(PetscObjectComm((PetscObject)dm), PETSC_ERR_ARG_WRONG, "Mismatch between blocksize %d and local storage size %d", blockSize, localSize); 47 ierr = VecCreate(PetscObjectComm((PetscObject)dm), vec);CHKERRQ(ierr); 48 ierr = VecSetSizes(*vec, localSize, PETSC_DETERMINE);CHKERRQ(ierr); 49 ierr = VecSetBlockSize(*vec, bs);CHKERRQ(ierr); 50 ierr = VecSetType(*vec,dm->vectype);CHKERRQ(ierr); 51 ierr = VecSetDM(*vec, dm);CHKERRQ(ierr); 52 /* ierr = VecSetLocalToGlobalMapping(*vec, dm->ltogmap);CHKERRQ(ierr); */ 53 PetscFunctionReturn(0); 54 } 55 56 PetscErrorCode DMCreateLocalVector_Section_Private(DM dm,Vec *vec) 57 { 58 PetscSection section; 59 PetscInt localSize, blockSize = -1, pStart, pEnd, p; 60 PetscErrorCode ierr; 61 62 PetscFunctionBegin; 63 ierr = DMGetSection(dm, §ion);CHKERRQ(ierr); 64 ierr = PetscSectionGetChart(section, &pStart, &pEnd);CHKERRQ(ierr); 65 for (p = pStart; p < pEnd; ++p) { 66 PetscInt dof; 67 68 ierr = PetscSectionGetDof(section, p, &dof);CHKERRQ(ierr); 69 if ((blockSize < 0) && (dof > 0)) blockSize = dof; 70 if ((dof > 0) && (dof != blockSize)) { 71 blockSize = 1; 72 break; 73 } 74 } 75 ierr = PetscSectionGetStorageSize(section, &localSize);CHKERRQ(ierr); 76 ierr = VecCreate(PETSC_COMM_SELF, vec);CHKERRQ(ierr); 77 ierr = VecSetSizes(*vec, localSize, localSize);CHKERRQ(ierr); 78 ierr = VecSetBlockSize(*vec, blockSize);CHKERRQ(ierr); 79 ierr = VecSetType(*vec,dm->vectype);CHKERRQ(ierr); 80 ierr = VecSetDM(*vec, dm);CHKERRQ(ierr); 81 PetscFunctionReturn(0); 82 } 83 84 /*@C 85 DMCreateSectionSubDM - Returns an IS and subDM+subSection encapsulating a subproblem defined by the fields in a PetscSection in the DM. 86 87 Not collective 88 89 Input Parameters: 90 + dm - The DM object 91 . numFields - The number of fields in this subproblem 92 - fields - The field numbers of the selected fields 93 94 Output Parameters: 95 + is - The global indices for the subproblem 96 - subdm - The DM for the subproblem, which must already have be cloned from dm 97 98 Note: This handles all information in the DM class and the PetscSection. This is used as the basis for creating subDMs in specialized classes, 99 such as Plex and Forest. 100 101 Level: intermediate 102 103 .seealso DMCreateSubDM(), DMGetSection(), DMPlexSetMigrationSF(), DMView() 104 @*/ 105 PetscErrorCode DMCreateSectionSubDM(DM dm, PetscInt numFields, const PetscInt fields[], IS *is, DM *subdm) 106 { 107 PetscSection section, sectionGlobal; 108 PetscInt *subIndices; 109 PetscInt subSize = 0, subOff = 0, Nf, f, pStart, pEnd, p; 110 PetscErrorCode ierr; 111 112 PetscFunctionBegin; 113 if (!numFields) PetscFunctionReturn(0); 114 ierr = DMGetSection(dm, §ion);CHKERRQ(ierr); 115 ierr = DMGetGlobalSection(dm, §ionGlobal);CHKERRQ(ierr); 116 if (!section) SETERRQ(PetscObjectComm((PetscObject)dm), PETSC_ERR_ARG_WRONG, "Must set default section for DM before splitting fields"); 117 if (!sectionGlobal) SETERRQ(PetscObjectComm((PetscObject)dm), PETSC_ERR_ARG_WRONG, "Must set default global section for DM before splitting fields"); 118 ierr = PetscSectionGetNumFields(section, &Nf);CHKERRQ(ierr); 119 if (numFields > Nf) SETERRQ2(PetscObjectComm((PetscObject)dm), PETSC_ERR_ARG_WRONG, "Number of requested fields %d greater than number of DM fields %d", numFields, Nf); 120 if (is) { 121 PetscInt bs, bsLocal[2], bsMinMax[2]; 122 123 for (f = 0, bs = 0; f < numFields; ++f) { 124 PetscInt Nc; 125 126 ierr = PetscSectionGetFieldComponents(section, fields[f], &Nc);CHKERRQ(ierr); 127 bs += Nc; 128 } 129 ierr = PetscSectionGetChart(sectionGlobal, &pStart, &pEnd);CHKERRQ(ierr); 130 for (p = pStart; p < pEnd; ++p) { 131 PetscInt gdof, pSubSize = 0; 132 133 ierr = PetscSectionGetDof(sectionGlobal, p, &gdof);CHKERRQ(ierr); 134 if (gdof > 0) { 135 for (f = 0; f < numFields; ++f) { 136 PetscInt fdof, fcdof; 137 138 ierr = PetscSectionGetFieldDof(section, p, fields[f], &fdof);CHKERRQ(ierr); 139 ierr = PetscSectionGetFieldConstraintDof(section, p, fields[f], &fcdof);CHKERRQ(ierr); 140 pSubSize += fdof-fcdof; 141 } 142 subSize += pSubSize; 143 if (pSubSize && bs != pSubSize) { 144 /* Layout does not admit a pointwise block size */ 145 bs = 1; 146 } 147 } 148 } 149 /* Must have same blocksize on all procs (some might have no points) */ 150 bsLocal[0] = bs < 0 ? PETSC_MAX_INT : bs; bsLocal[1] = bs; 151 ierr = PetscGlobalMinMaxInt(PetscObjectComm((PetscObject) dm), bsLocal, bsMinMax);CHKERRQ(ierr); 152 if (bsMinMax[0] != bsMinMax[1]) {bs = 1;} 153 else {bs = bsMinMax[0];} 154 ierr = PetscMalloc1(subSize, &subIndices);CHKERRQ(ierr); 155 for (p = pStart; p < pEnd; ++p) { 156 PetscInt gdof, goff; 157 158 ierr = PetscSectionGetDof(sectionGlobal, p, &gdof);CHKERRQ(ierr); 159 if (gdof > 0) { 160 ierr = PetscSectionGetOffset(sectionGlobal, p, &goff);CHKERRQ(ierr); 161 for (f = 0; f < numFields; ++f) { 162 PetscInt fdof, fcdof, fc, f2, poff = 0; 163 164 /* Can get rid of this loop by storing field information in the global section */ 165 for (f2 = 0; f2 < fields[f]; ++f2) { 166 ierr = PetscSectionGetFieldDof(section, p, f2, &fdof);CHKERRQ(ierr); 167 ierr = PetscSectionGetFieldConstraintDof(section, p, f2, &fcdof);CHKERRQ(ierr); 168 poff += fdof-fcdof; 169 } 170 ierr = PetscSectionGetFieldDof(section, p, fields[f], &fdof);CHKERRQ(ierr); 171 ierr = PetscSectionGetFieldConstraintDof(section, p, fields[f], &fcdof);CHKERRQ(ierr); 172 for (fc = 0; fc < fdof-fcdof; ++fc, ++subOff) { 173 subIndices[subOff] = goff+poff+fc; 174 } 175 } 176 } 177 } 178 ierr = ISCreateGeneral(PetscObjectComm((PetscObject)dm), subSize, subIndices, PETSC_OWN_POINTER, is);CHKERRQ(ierr); 179 if (bs > 1) { 180 /* We need to check that the block size does not come from non-contiguous fields */ 181 PetscInt i, j, set = 1; 182 for (i = 0; i < subSize; i += bs) { 183 for (j = 0; j < bs; ++j) { 184 if (subIndices[i+j] != subIndices[i]+j) {set = 0; break;} 185 } 186 } 187 if (set) {ierr = ISSetBlockSize(*is, bs);CHKERRQ(ierr);} 188 } 189 } 190 if (subdm) { 191 PetscSection subsection; 192 PetscBool haveNull = PETSC_FALSE; 193 PetscInt f, nf = 0; 194 195 ierr = PetscSectionCreateSubsection(section, numFields, fields, &subsection);CHKERRQ(ierr); 196 ierr = DMSetSection(*subdm, subsection);CHKERRQ(ierr); 197 ierr = PetscSectionDestroy(&subsection);CHKERRQ(ierr); 198 for (f = 0; f < numFields; ++f) { 199 (*subdm)->nullspaceConstructors[f] = dm->nullspaceConstructors[fields[f]]; 200 if ((*subdm)->nullspaceConstructors[f]) { 201 haveNull = PETSC_TRUE; 202 nf = f; 203 } 204 } 205 if (haveNull && is) { 206 MatNullSpace nullSpace; 207 208 ierr = (*(*subdm)->nullspaceConstructors[nf])(*subdm, nf, &nullSpace);CHKERRQ(ierr); 209 ierr = PetscObjectCompose((PetscObject) *is, "nullspace", (PetscObject) nullSpace);CHKERRQ(ierr); 210 ierr = MatNullSpaceDestroy(&nullSpace);CHKERRQ(ierr); 211 } 212 if (dm->probs) { 213 ierr = DMSetNumFields(*subdm, numFields);CHKERRQ(ierr); 214 for (f = 0; f < numFields; ++f) { 215 PetscObject disc; 216 217 ierr = DMGetField(dm, fields[f], NULL, &disc);CHKERRQ(ierr); 218 ierr = DMSetField(*subdm, f, NULL, disc);CHKERRQ(ierr); 219 } 220 ierr = DMCreateDS(*subdm);CHKERRQ(ierr); 221 if (numFields == 1 && is) { 222 PetscObject disc, space, pmat; 223 224 ierr = DMGetField(*subdm, 0, NULL, &disc);CHKERRQ(ierr); 225 ierr = PetscObjectQuery(disc, "nullspace", &space);CHKERRQ(ierr); 226 if (space) {ierr = PetscObjectCompose((PetscObject) *is, "nullspace", space);CHKERRQ(ierr);} 227 ierr = PetscObjectQuery(disc, "nearnullspace", &space);CHKERRQ(ierr); 228 if (space) {ierr = PetscObjectCompose((PetscObject) *is, "nearnullspace", space);CHKERRQ(ierr);} 229 ierr = PetscObjectQuery(disc, "pmat", &pmat);CHKERRQ(ierr); 230 if (pmat) {ierr = PetscObjectCompose((PetscObject) *is, "pmat", pmat);CHKERRQ(ierr);} 231 } 232 ierr = PetscDSCopyConstants(dm->probs[0].ds, (*subdm)->probs[0].ds);CHKERRQ(ierr); 233 ierr = PetscDSCopyBoundary(dm->probs[0].ds, (*subdm)->probs[0].ds);CHKERRQ(ierr); 234 ierr = PetscDSSelectEquations(dm->probs[0].ds, numFields, fields, (*subdm)->probs[0].ds);CHKERRQ(ierr); 235 } 236 if (dm->coarseMesh) { 237 ierr = DMCreateSubDM(dm->coarseMesh, numFields, fields, NULL, &(*subdm)->coarseMesh);CHKERRQ(ierr); 238 } 239 } 240 PetscFunctionReturn(0); 241 } 242 243 /*@C 244 DMCreateSectionSuperDM - Returns an arrays of ISes and DM+Section encapsulating a superproblem defined by the DM+Sections passed in. 245 246 Not collective 247 248 Input Parameter: 249 + dms - The DM objects 250 - len - The number of DMs 251 252 Output Parameters: 253 + is - The global indices for the subproblem, or NULL 254 - superdm - The DM for the superproblem, which must already have be cloned 255 256 Note: This handles all information in the DM class and the PetscSection. This is used as the basis for creating subDMs in specialized classes, 257 such as Plex and Forest. 258 259 Level: intermediate 260 261 .seealso DMCreateSuperDM(), DMGetSection(), DMPlexSetMigrationSF(), DMView() 262 @*/ 263 PetscErrorCode DMCreateSectionSuperDM(DM dms[], PetscInt len, IS **is, DM *superdm) 264 { 265 MPI_Comm comm; 266 PetscSection supersection, *sections, *sectionGlobals; 267 PetscInt *Nfs, Nf = 0, f, supf, nullf = -1, i; 268 PetscBool haveNull = PETSC_FALSE; 269 PetscErrorCode ierr; 270 271 PetscFunctionBegin; 272 ierr = PetscObjectGetComm((PetscObject)dms[0], &comm);CHKERRQ(ierr); 273 /* Pull out local and global sections */ 274 ierr = PetscMalloc3(len, &Nfs, len, §ions, len, §ionGlobals);CHKERRQ(ierr); 275 for (i = 0 ; i < len; ++i) { 276 ierr = DMGetSection(dms[i], §ions[i]);CHKERRQ(ierr); 277 ierr = DMGetGlobalSection(dms[i], §ionGlobals[i]);CHKERRQ(ierr); 278 if (!sections[i]) SETERRQ(comm, PETSC_ERR_ARG_WRONG, "Must set default section for DM before splitting fields"); 279 if (!sectionGlobals[i]) SETERRQ(comm, PETSC_ERR_ARG_WRONG, "Must set default global section for DM before splitting fields"); 280 ierr = PetscSectionGetNumFields(sections[i], &Nfs[i]);CHKERRQ(ierr); 281 Nf += Nfs[i]; 282 } 283 /* Create the supersection */ 284 ierr = PetscSectionCreateSupersection(sections, len, &supersection);CHKERRQ(ierr); 285 ierr = DMSetSection(*superdm, supersection);CHKERRQ(ierr); 286 /* Create ISes */ 287 if (is) { 288 PetscSection supersectionGlobal; 289 PetscInt bs = -1, startf = 0; 290 291 ierr = PetscMalloc1(len, is);CHKERRQ(ierr); 292 ierr = DMGetDefaultGlobalSection(*superdm, &supersectionGlobal);CHKERRQ(ierr); 293 for (i = 0 ; i < len; startf += Nfs[i], ++i) { 294 PetscInt *subIndices; 295 PetscInt subSize, subOff, pStart, pEnd, p, start, end, dummy; 296 297 ierr = PetscSectionGetChart(sectionGlobals[i], &pStart, &pEnd);CHKERRQ(ierr); 298 ierr = PetscSectionGetConstrainedStorageSize(sectionGlobals[i], &subSize);CHKERRQ(ierr); 299 ierr = PetscMalloc1(subSize, &subIndices);CHKERRQ(ierr); 300 for (p = pStart, subOff = 0; p < pEnd; ++p) { 301 PetscInt gdof, gcdof, gtdof, d; 302 303 ierr = PetscSectionGetDof(sectionGlobals[i], p, &gdof);CHKERRQ(ierr); 304 ierr = PetscSectionGetConstraintDof(sections[i], p, &gcdof);CHKERRQ(ierr); 305 gtdof = gdof - gcdof; 306 if (gdof > 0 && gtdof) { 307 if (bs < 0) {bs = gtdof;} 308 else if (bs != gtdof) {bs = 1;} 309 ierr = DMGetGlobalFieldOffset_Private(*superdm, p, startf, &start, &dummy);CHKERRQ(ierr); 310 ierr = DMGetGlobalFieldOffset_Private(*superdm, p, startf+Nfs[i]-1, &dummy, &end);CHKERRQ(ierr); 311 if (end-start != gtdof) SETERRQ4(PETSC_COMM_SELF, PETSC_ERR_ARG_SIZ, "Invalid number of global dofs %D != %D for dm %D on point %D", end-start, gtdof, i, p); 312 for (d = start; d < end; ++d, ++subOff) subIndices[subOff] = d; 313 } 314 } 315 ierr = ISCreateGeneral(comm, subSize, subIndices, PETSC_OWN_POINTER, &(*is)[i]);CHKERRQ(ierr); 316 /* Must have same blocksize on all procs (some might have no points) */ 317 { 318 PetscInt bs = -1, bsLocal[2], bsMinMax[2]; 319 320 bsLocal[0] = bs < 0 ? PETSC_MAX_INT : bs; bsLocal[1] = bs; 321 ierr = PetscGlobalMinMaxInt(comm, bsLocal, bsMinMax);CHKERRQ(ierr); 322 if (bsMinMax[0] != bsMinMax[1]) {bs = 1;} 323 else {bs = bsMinMax[0];} 324 ierr = ISSetBlockSize((*is)[i], bs);CHKERRQ(ierr); 325 } 326 } 327 } 328 /* Preserve discretizations */ 329 if (len && dms[0]->probs) { 330 ierr = DMSetNumFields(*superdm, Nf);CHKERRQ(ierr); 331 for (i = 0, supf = 0; i < len; ++i) { 332 for (f = 0; f < Nfs[i]; ++f, ++supf) { 333 PetscObject disc; 334 335 ierr = DMGetField(dms[i], f, NULL, &disc);CHKERRQ(ierr); 336 ierr = DMSetField(*superdm, supf, NULL, disc);CHKERRQ(ierr); 337 } 338 } 339 ierr = DMCreateDS(*superdm);CHKERRQ(ierr); 340 } 341 /* Preserve nullspaces */ 342 for (i = 0, supf = 0; i < len; ++i) { 343 for (f = 0; f < Nfs[i]; ++f, ++supf) { 344 (*superdm)->nullspaceConstructors[supf] = dms[i]->nullspaceConstructors[f]; 345 if ((*superdm)->nullspaceConstructors[supf]) { 346 haveNull = PETSC_TRUE; 347 nullf = supf; 348 } 349 } 350 } 351 /* Attach nullspace to IS */ 352 if (haveNull && is) { 353 MatNullSpace nullSpace; 354 355 ierr = (*(*superdm)->nullspaceConstructors[nullf])(*superdm, nullf, &nullSpace);CHKERRQ(ierr); 356 ierr = PetscObjectCompose((PetscObject) (*is)[nullf], "nullspace", (PetscObject) nullSpace);CHKERRQ(ierr); 357 ierr = MatNullSpaceDestroy(&nullSpace);CHKERRQ(ierr); 358 } 359 ierr = PetscSectionDestroy(&supersection);CHKERRQ(ierr); 360 ierr = PetscFree3(Nfs, sections, sectionGlobals);CHKERRQ(ierr); 361 PetscFunctionReturn(0); 362 } 363