Date: 2022-08-02T03:14:16+00:00

Actual source code: plexorient.c

      1: #include <petsc/private/dmpleximpl.h>
      2: #include <petscsf.h>

      4: /*@
      5:   DMPlexOrientPoint - Act with the given orientation on the cone points of this mesh point, and update its use in the mesh.

      7:   Not Collective

      9:   Input Parameters:
     10: + dm - The DM
     11: . p  - The mesh point
     12: - o  - The orientation

     14:   Level: intermediate

     16: .seealso: DMPlexOrient(), DMPlexGetCone(), DMPlexGetConeOrientation(), DMPlexInterpolate(), DMPlexGetChart()
     17: @*/
     18: PetscErrorCode DMPlexOrientPoint(DM dm, PetscInt p, PetscInt o)
     19: {
     20:   DMPolytopeType  ct;
     21:   const PetscInt *arr, *cone, *ornt, *support;
     22:   PetscInt       *newcone, *newornt;
     23:   PetscInt        coneSize, c, supportSize, s;

     26:   DMPlexGetCellType(dm, p, &ct);
     27:   arr  = DMPolytopeTypeGetArrangment(ct, o);
     28:   DMPlexGetConeSize(dm, p, &coneSize);
     29:   DMPlexGetCone(dm, p, &cone);
     30:   DMPlexGetConeOrientation(dm, p, &ornt);
     31:   DMGetWorkArray(dm, coneSize, MPIU_INT, &newcone);
     32:   DMGetWorkArray(dm, coneSize, MPIU_INT, &newornt);
     33:   for (c = 0; c < coneSize; ++c) {
     34:     DMPolytopeType ft;
     35:     PetscInt       nO;

     37:     DMPlexGetCellType(dm, cone[c], &ft);
     38:     nO   = DMPolytopeTypeGetNumArrangments(ft)/2;
     39:     newcone[c] = cone[arr[c*2+0]];
     40:     newornt[c] = DMPolytopeTypeComposeOrientation(ft, arr[c*2+1], ornt[arr[c*2+0]]);
     42:   }
     43:   DMPlexSetCone(dm, p, newcone);
     44:   DMPlexSetConeOrientation(dm, p, newornt);
     45:   DMRestoreWorkArray(dm, coneSize, MPIU_INT, &newcone);
     46:   DMRestoreWorkArray(dm, coneSize, MPIU_INT, &newornt);
     47:   /* Update orientation of this point in the support points */
     48:   DMPlexGetSupportSize(dm, p, &supportSize);
     49:   DMPlexGetSupport(dm, p, &support);
     50:   for (s = 0; s < supportSize; ++s) {
     51:     DMPlexGetConeSize(dm, support[s], &coneSize);
     52:     DMPlexGetCone(dm, support[s], &cone);
     53:     DMPlexGetConeOrientation(dm, support[s], &ornt);
     54:     for (c = 0; c < coneSize; ++c) {
     55:       PetscInt po;

     57:       if (cone[c] != p) continue;
     58:       /* ornt[c] * 0 = target = po * o so that po = ornt[c] * o^{-1} */
     59:       po   = DMPolytopeTypeComposeOrientationInv(ct, ornt[c], o);
     60:       DMPlexInsertConeOrientation(dm, support[s], c, po);
     61:     }
     62:   }
     63:   return 0;
     64: }

     66: /*
     67:   - Checks face match
     68:     - Flips non-matching
     69:   - Inserts faces of support cells in FIFO
     70: */
     71: static PetscErrorCode DMPlexCheckFace_Internal(DM dm, PetscInt *faceFIFO, PetscInt *fTop, PetscInt *fBottom, PetscInt cStart, PetscInt fStart, PetscInt fEnd, PetscBT seenCells, PetscBT flippedCells, PetscBT seenFaces)
     72: {
     73:   const PetscInt *support, *coneA, *coneB, *coneOA, *coneOB;
     74:   PetscInt        supportSize, coneSizeA, coneSizeB, posA = -1, posB = -1;
     75:   PetscInt        face, dim, seenA, flippedA, seenB, flippedB, mismatch, c;

     77:   face = faceFIFO[(*fTop)++];
     78:   DMGetDimension(dm, &dim);
     79:   DMPlexGetSupportSize(dm, face, &supportSize);
     80:   DMPlexGetSupport(dm, face, &support);
     81:   if (supportSize < 2) return 0;
     83:   seenA    = PetscBTLookup(seenCells,    support[0]-cStart);
     84:   flippedA = PetscBTLookup(flippedCells, support[0]-cStart) ? 1 : 0;
     85:   seenB    = PetscBTLookup(seenCells,    support[1]-cStart);
     86:   flippedB = PetscBTLookup(flippedCells, support[1]-cStart) ? 1 : 0;

     88:   DMPlexGetConeSize(dm, support[0], &coneSizeA);
     89:   DMPlexGetConeSize(dm, support[1], &coneSizeB);
     90:   DMPlexGetCone(dm, support[0], &coneA);
     91:   DMPlexGetCone(dm, support[1], &coneB);
     92:   DMPlexGetConeOrientation(dm, support[0], &coneOA);
     93:   DMPlexGetConeOrientation(dm, support[1], &coneOB);
     94:   for (c = 0; c < coneSizeA; ++c) {
     95:     if (!PetscBTLookup(seenFaces, coneA[c]-fStart)) {
     96:       faceFIFO[(*fBottom)++] = coneA[c];
     97:       PetscBTSet(seenFaces, coneA[c]-fStart);
     98:     }
     99:     if (coneA[c] == face) posA = c;
    101:   }
    103:   for (c = 0; c < coneSizeB; ++c) {
    104:     if (!PetscBTLookup(seenFaces, coneB[c]-fStart)) {
    105:       faceFIFO[(*fBottom)++] = coneB[c];
    106:       PetscBTSet(seenFaces, coneB[c]-fStart);
    107:     }
    108:     if (coneB[c] == face) posB = c;
    110:   }

    113:   if (dim == 1) {
    114:     mismatch = posA == posB;
    115:   } else {
    116:     mismatch = coneOA[posA] == coneOB[posB];
    117:   }

    119:   if (mismatch ^ (flippedA ^ flippedB)) {
    121:     if (!seenA && !flippedA) {
    122:       PetscBTSet(flippedCells, support[0]-cStart);
    123:     } else if (!seenB && !flippedB) {
    124:       PetscBTSet(flippedCells, support[1]-cStart);
    125:     } else SETERRQ(PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Inconsistent mesh orientation: Fault mesh is non-orientable");
    127:   PetscBTSet(seenCells, support[0]-cStart);
    128:   PetscBTSet(seenCells, support[1]-cStart);
    129:   return 0;
    130: }

    132: /*@
    133:   DMPlexOrient - Give a consistent orientation to the input mesh

    135:   Input Parameters:
    136: . dm - The DM

    138:   Note: The orientation data for the DM are change in-place.
    139: $ This routine will fail for non-orientable surfaces, such as the Moebius strip.

    141:   Level: advanced

    143: .seealso: DMCreate(), DMPLEX
    144: @*/
    145: PetscErrorCode DMPlexOrient(DM dm)
    146: {
    147:   MPI_Comm           comm;
    148:   PetscSF            sf;
    149:   const PetscInt    *lpoints;
    150:   const PetscSFNode *rpoints;
    151:   PetscSFNode       *rorntComp = NULL, *lorntComp = NULL;
    152:   PetscInt          *numNeighbors, **neighbors;
    153:   PetscSFNode       *nrankComp;
    154:   PetscBool         *match, *flipped;
    155:   PetscBT            seenCells, flippedCells, seenFaces;
    156:   PetscInt          *faceFIFO, fTop, fBottom, *cellComp, *faceComp;
    157:   PetscInt           numLeaves, numRoots, dim, h, cStart, cEnd, c, cell, fStart, fEnd, face, off, totNeighbors = 0;
    158:   PetscMPIInt        rank, size, numComponents, comp = 0;
    159:   PetscBool          flg, flg2;
    160:   PetscViewer        viewer = NULL, selfviewer = NULL;

    162:   PetscObjectGetComm((PetscObject) dm, &comm);
    163:   MPI_Comm_rank(comm, &rank);
    164:   MPI_Comm_size(comm, &size);
    165:   PetscOptionsHasName(((PetscObject) dm)->options,((PetscObject) dm)->prefix, "-orientation_view", &flg);
    166:   PetscOptionsHasName(((PetscObject) dm)->options,((PetscObject) dm)->prefix, "-orientation_view_synchronized", &flg2);
    167:   DMGetPointSF(dm, &sf);
    168:   PetscSFGetGraph(sf, &numRoots, &numLeaves, &lpoints, &rpoints);
    169:   /* Truth Table
    170:      mismatch    flips   do action   mismatch   flipA ^ flipB   action
    171:          F       0 flips     no         F             F           F
    172:          F       1 flip      yes        F             T           T
    173:          F       2 flips     no         T             F           T
    174:          T       0 flips     yes        T             T           F
    175:          T       1 flip      no
    176:          T       2 flips     yes
    177:   */
    178:   DMGetDimension(dm, &dim);
    179:   DMPlexGetVTKCellHeight(dm, &h);
    180:   DMPlexGetHeightStratum(dm, h,   &cStart, &cEnd);
    181:   DMPlexGetHeightStratum(dm, h+1, &fStart, &fEnd);
    182:   PetscBTCreate(cEnd - cStart, &seenCells);
    183:   PetscBTMemzero(cEnd - cStart, seenCells);
    184:   PetscBTCreate(cEnd - cStart, &flippedCells);
    185:   PetscBTMemzero(cEnd - cStart, flippedCells);
    186:   PetscBTCreate(fEnd - fStart, &seenFaces);
    187:   PetscBTMemzero(fEnd - fStart, seenFaces);
    188:   PetscCalloc3(fEnd - fStart, &faceFIFO, cEnd-cStart, &cellComp, fEnd-fStart, &faceComp);
    189:   /*
    190:    OLD STYLE
    191:    - Add an integer array over cells and faces (component) for connected component number
    192:    Foreach component
    193:      - Mark the initial cell as seen
    194:      - Process component as usual
    195:      - Set component for all seenCells
    196:      - Wipe seenCells and seenFaces (flippedCells can stay)
    197:    - Generate parallel adjacency for component using SF and seenFaces
    198:    - Collect numComponents adj data from each proc to 0
    199:    - Build same serial graph
    200:    - Use same solver
    201:    - Use Scatterv to to send back flipped flags for each component
    202:    - Negate flippedCells by component

    204:    NEW STYLE
    205:    - Create the adj on each process
    206:    - Bootstrap to complete graph on proc 0
    207:   */
    208:   /* Loop over components */
    209:   for (cell = cStart; cell < cEnd; ++cell) cellComp[cell-cStart] = -1;
    210:   do {
    211:     /* Look for first unmarked cell */
    212:     for (cell = cStart; cell < cEnd; ++cell) if (cellComp[cell-cStart] < 0) break;
    213:     if (cell >= cEnd) break;
    214:     /* Initialize FIFO with first cell in component */
    215:     {
    216:       const PetscInt *cone;
    217:       PetscInt        coneSize;

    219:       fTop = fBottom = 0;
    220:       DMPlexGetConeSize(dm, cell, &coneSize);
    221:       DMPlexGetCone(dm, cell, &cone);
    222:       for (c = 0; c < coneSize; ++c) {
    223:         faceFIFO[fBottom++] = cone[c];
    224:         PetscBTSet(seenFaces, cone[c]-fStart);
    225:       }
    226:       PetscBTSet(seenCells, cell-cStart);
    227:     }
    228:     /* Consider each face in FIFO */
    229:     while (fTop < fBottom) {
    230:       DMPlexCheckFace_Internal(dm, faceFIFO, &fTop, &fBottom, cStart, fStart, fEnd, seenCells, flippedCells, seenFaces);
    231:     }
    232:     /* Set component for cells and faces */
    233:     for (cell = 0; cell < cEnd-cStart; ++cell) {
    234:       if (PetscBTLookup(seenCells, cell)) cellComp[cell] = comp;
    235:     }
    236:     for (face = 0; face < fEnd-fStart; ++face) {
    237:       if (PetscBTLookup(seenFaces, face)) faceComp[face] = comp;
    238:     }
    239:     /* Wipe seenCells and seenFaces for next component */
    240:     PetscBTMemzero(fEnd - fStart, seenFaces);
    241:     PetscBTMemzero(cEnd - cStart, seenCells);
    242:     ++comp;
    243:   } while (1);
    244:   numComponents = comp;
    245:   if (flg) {
    246:     PetscViewer v;

    248:     PetscViewerASCIIGetStdout(comm, &v);
    249:     PetscViewerASCIIPushSynchronized(v);
    250:     PetscViewerASCIISynchronizedPrintf(v, "[%d]BT for serial flipped cells:\n", rank);
    251:     PetscBTView(cEnd-cStart, flippedCells, v);
    252:     PetscViewerFlush(v);
    253:     PetscViewerASCIIPopSynchronized(v);
    254:   }
    255:   /* Now all subdomains are oriented, but we need a consistent parallel orientation */
    256:   if (numLeaves >= 0) {
    257:     /* Store orientations of boundary faces*/
    258:     PetscCalloc2(numRoots,&rorntComp,numRoots,&lorntComp);
    259:     for (face = fStart; face < fEnd; ++face) {
    260:       const PetscInt *cone, *support, *ornt;
    261:       PetscInt        coneSize, supportSize;

    263:       DMPlexGetSupportSize(dm, face, &supportSize);
    264:       if (supportSize != 1) continue;
    265:       DMPlexGetSupport(dm, face, &support);

    267:       DMPlexGetCone(dm, support[0], &cone);
    268:       DMPlexGetConeSize(dm, support[0], &coneSize);
    269:       DMPlexGetConeOrientation(dm, support[0], &ornt);
    270:       for (c = 0; c < coneSize; ++c) if (cone[c] == face) break;
    271:       if (dim == 1) {
    272:         /* Use cone position instead, shifted to -1 or 1 */
    273:         if (PetscBTLookup(flippedCells, support[0]-cStart)) rorntComp[face].rank = 1-c*2;
    274:         else                                                rorntComp[face].rank = c*2-1;
    275:       } else {
    276:         if (PetscBTLookup(flippedCells, support[0]-cStart)) rorntComp[face].rank = ornt[c] < 0 ? -1 :  1;
    277:         else                                                rorntComp[face].rank = ornt[c] < 0 ?  1 : -1;
    278:       }
    279:       rorntComp[face].index = faceComp[face-fStart];
    280:     }
    281:     /* Communicate boundary edge orientations */
    282:     PetscSFBcastBegin(sf, MPIU_2INT, rorntComp, lorntComp,MPI_REPLACE);
    283:     PetscSFBcastEnd(sf, MPIU_2INT, rorntComp, lorntComp,MPI_REPLACE);
    284:   }
    285:   /* Get process adjacency */
    286:   PetscMalloc2(numComponents, &numNeighbors, numComponents, &neighbors);
    287:   viewer = PETSC_VIEWER_STDOUT_(PetscObjectComm((PetscObject)dm));
    288:   if (flg2) PetscViewerASCIIPushSynchronized(viewer);
    289:   PetscViewerGetSubViewer(viewer,PETSC_COMM_SELF,&selfviewer);
    290:   for (comp = 0; comp < numComponents; ++comp) {
    291:     PetscInt  l, n;

    293:     numNeighbors[comp] = 0;
    294:     PetscMalloc1(PetscMax(numLeaves, 0), &neighbors[comp]);
    295:     /* I know this is p^2 time in general, but for bounded degree its alright */
    296:     for (l = 0; l < numLeaves; ++l) {
    297:       const PetscInt face = lpoints[l];

    299:       /* Find a representative face (edge) separating pairs of procs */
    300:       if ((face >= fStart) && (face < fEnd) && (faceComp[face-fStart] == comp)) {
    301:         const PetscInt rrank = rpoints[l].rank;
    302:         const PetscInt rcomp = lorntComp[face].index;

    304:         for (n = 0; n < numNeighbors[comp]; ++n) if ((rrank == rpoints[neighbors[comp][n]].rank) && (rcomp == lorntComp[lpoints[neighbors[comp][n]]].index)) break;
    305:         if (n >= numNeighbors[comp]) {
    306:           PetscInt supportSize;

    308:           DMPlexGetSupportSize(dm, face, &supportSize);
    310:           if (flg) PetscViewerASCIIPrintf(selfviewer, "[%d]: component %d, Found representative leaf %d (face %d) connecting to face %d on (%d, %d) with orientation %d\n", rank, comp, l, face, rpoints[l].index, rrank, rcomp, lorntComp[face].rank);
    311:           neighbors[comp][numNeighbors[comp]++] = l;
    312:         }
    313:       }
    314:     }
    315:     totNeighbors += numNeighbors[comp];
    316:   }
    317:   PetscViewerRestoreSubViewer(viewer,PETSC_COMM_SELF,&selfviewer);
    318:   PetscViewerFlush(viewer);
    319:   if (flg2) PetscViewerASCIIPopSynchronized(viewer);
    320:   PetscMalloc2(totNeighbors, &nrankComp, totNeighbors, &match);
    321:   for (comp = 0, off = 0; comp < numComponents; ++comp) {
    322:     PetscInt n;

    324:     for (n = 0; n < numNeighbors[comp]; ++n, ++off) {
    325:       const PetscInt face = lpoints[neighbors[comp][n]];
    326:       const PetscInt o    = rorntComp[face].rank*lorntComp[face].rank;

    328:       if      (o < 0) match[off] = PETSC_TRUE;
    329:       else if (o > 0) match[off] = PETSC_FALSE;
    330:       else SETERRQ(PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Invalid face %d (%d, %d) neighbor: %d comp: %d", face, rorntComp[face], lorntComp[face], neighbors[comp][n], comp);
    331:       nrankComp[off].rank  = rpoints[neighbors[comp][n]].rank;
    332:       nrankComp[off].index = lorntComp[lpoints[neighbors[comp][n]]].index;
    333:     }
    334:     PetscFree(neighbors[comp]);
    335:   }
    336:   /* Collect the graph on 0 */
    337:   if (numLeaves >= 0) {
    338:     Mat          G;
    339:     PetscBT      seenProcs, flippedProcs;
    340:     PetscInt    *procFIFO, pTop, pBottom;
    341:     PetscInt    *N   = NULL, *Noff;
    342:     PetscSFNode *adj = NULL;
    343:     PetscBool   *val = NULL;
    344:     PetscMPIInt *recvcounts = NULL, *displs = NULL, *Nc, p, o;
    345:     PetscMPIInt  size = 0;

    347:     PetscCalloc1(numComponents, &flipped);
    348:     if (rank == 0) MPI_Comm_size(comm, &size);
    349:     PetscCalloc4(size, &recvcounts, size+1, &displs, size, &Nc, size+1, &Noff);
    350:     MPI_Gather(&numComponents, 1, MPI_INT, Nc, 1, MPI_INT, 0, comm);
    351:     for (p = 0; p < size; ++p) {
    352:       displs[p+1] = displs[p] + Nc[p];
    353:     }
    354:     if (rank == 0) PetscMalloc1(displs[size],&N);
    355:     MPI_Gatherv(numNeighbors, numComponents, MPIU_INT, N, Nc, displs, MPIU_INT, 0, comm);
    356:     for (p = 0, o = 0; p < size; ++p) {
    357:       recvcounts[p] = 0;
    358:       for (c = 0; c < Nc[p]; ++c, ++o) recvcounts[p] += N[o];
    359:       displs[p+1] = displs[p] + recvcounts[p];
    360:     }
    361:     if (rank == 0) PetscMalloc2(displs[size], &adj, displs[size], &val);
    362:     MPI_Gatherv(nrankComp, totNeighbors, MPIU_2INT, adj, recvcounts, displs, MPIU_2INT, 0, comm);
    363:     MPI_Gatherv(match, totNeighbors, MPIU_BOOL, val, recvcounts, displs, MPIU_BOOL, 0, comm);
    364:     PetscFree2(numNeighbors, neighbors);
    365:     if (rank == 0) {
    366:       for (p = 1; p <= size; ++p) {Noff[p] = Noff[p-1] + Nc[p-1];}
    367:       if (flg) {
    368:         PetscInt n;

    370:         for (p = 0, off = 0; p < size; ++p) {
    371:           for (c = 0; c < Nc[p]; ++c) {
    372:             PetscPrintf(PETSC_COMM_SELF, "Proc %d Comp %d:\n", p, c);
    373:             for (n = 0; n < N[Noff[p]+c]; ++n, ++off) {
    374:               PetscPrintf(PETSC_COMM_SELF, "  edge (%d, %d) (%d):\n", adj[off].rank, adj[off].index, val[off]);
    375:             }
    376:           }
    377:         }
    378:       }
    379:       /* Symmetrize the graph */
    380:       MatCreate(PETSC_COMM_SELF, &G);
    381:       MatSetSizes(G, Noff[size], Noff[size], Noff[size], Noff[size]);
    382:       MatSetUp(G);
    383:       for (p = 0, off = 0; p < size; ++p) {
    384:         for (c = 0; c < Nc[p]; ++c) {
    385:           const PetscInt r = Noff[p]+c;
    386:           PetscInt       n;

    388:           for (n = 0; n < N[r]; ++n, ++off) {
    389:             const PetscInt    q = Noff[adj[off].rank] + adj[off].index;
    390:             const PetscScalar o = val[off] ? 1.0 : 0.0;

    392:             MatSetValues(G, 1, &r, 1, &q, &o, INSERT_VALUES);
    393:             MatSetValues(G, 1, &q, 1, &r, &o, INSERT_VALUES);
    394:           }
    395:         }
    396:       }
    397:       MatAssemblyBegin(G, MAT_FINAL_ASSEMBLY);
    398:       MatAssemblyEnd(G, MAT_FINAL_ASSEMBLY);

    400:       PetscBTCreate(Noff[size], &seenProcs);
    401:       PetscBTMemzero(Noff[size], seenProcs);
    402:       PetscBTCreate(Noff[size], &flippedProcs);
    403:       PetscBTMemzero(Noff[size], flippedProcs);
    404:       PetscMalloc1(Noff[size], &procFIFO);
    405:       pTop = pBottom = 0;
    406:       for (p = 0; p < Noff[size]; ++p) {
    407:         if (PetscBTLookup(seenProcs, p)) continue;
    408:         /* Initialize FIFO with next proc */
    409:         procFIFO[pBottom++] = p;
    410:         PetscBTSet(seenProcs, p);
    411:         /* Consider each proc in FIFO */
    412:         while (pTop < pBottom) {
    413:           const PetscScalar *ornt;
    414:           const PetscInt    *neighbors;
    415:           PetscInt           proc, nproc, seen, flippedA, flippedB, mismatch, numNeighbors, n;

    417:           proc     = procFIFO[pTop++];
    418:           flippedA = PetscBTLookup(flippedProcs, proc) ? 1 : 0;
    419:           MatGetRow(G, proc, &numNeighbors, &neighbors, &ornt);
    420:           /* Loop over neighboring procs */
    421:           for (n = 0; n < numNeighbors; ++n) {
    422:             nproc    = neighbors[n];
    423:             mismatch = PetscRealPart(ornt[n]) > 0.5 ? 0 : 1;
    424:             seen     = PetscBTLookup(seenProcs, nproc);
    425:             flippedB = PetscBTLookup(flippedProcs, nproc) ? 1 : 0;

    427:             if (mismatch ^ (flippedA ^ flippedB)) {
    429:               if (!flippedB) {
    430:                 PetscBTSet(flippedProcs, nproc);
    431:               } else SETERRQ(PETSC_COMM_SELF, PETSC_ERR_ARG_WRONG, "Inconsistent mesh orientation: Fault mesh is non-orientable");
    433:             if (!seen) {
    434:               procFIFO[pBottom++] = nproc;
    435:               PetscBTSet(seenProcs, nproc);
    436:             }
    437:           }
    438:         }
    439:       }
    440:       PetscFree(procFIFO);
    441:       MatDestroy(&G);
    442:       PetscFree2(adj, val);
    443:       PetscBTDestroy(&seenProcs);
    444:     }
    445:     /* Scatter flip flags */
    446:     {
    447:       PetscBool *flips = NULL;

    449:       if (rank == 0) {
    450:         PetscMalloc1(Noff[size], &flips);
    451:         for (p = 0; p < Noff[size]; ++p) {
    452:           flips[p] = PetscBTLookup(flippedProcs, p) ? PETSC_TRUE : PETSC_FALSE;
    453:           if (flg && flips[p]) PetscPrintf(comm, "Flipping Proc+Comp %d:\n", p);
    454:         }
    455:         for (p = 0; p < size; ++p) {
    456:           displs[p+1] = displs[p] + Nc[p];
    457:         }
    458:       }
    459:       MPI_Scatterv(flips, Nc, displs, MPIU_BOOL, flipped, numComponents, MPIU_BOOL, 0, comm);
    460:       PetscFree(flips);
    461:     }
    462:     if (rank == 0) PetscBTDestroy(&flippedProcs);
    463:     PetscFree(N);
    464:     PetscFree4(recvcounts, displs, Nc, Noff);
    465:     PetscFree2(nrankComp, match);

    467:     /* Decide whether to flip cells in each component */
    468:     for (c = 0; c < cEnd-cStart; ++c) {if (flipped[cellComp[c]]) PetscBTNegate(flippedCells, c);}
    469:     PetscFree(flipped);
    470:   }
    471:   if (flg) {
    472:     PetscViewer v;

    474:     PetscViewerASCIIGetStdout(comm, &v);
    475:     PetscViewerASCIIPushSynchronized(v);
    476:     PetscViewerASCIISynchronizedPrintf(v, "[%d]BT for parallel flipped cells:\n", rank);
    477:     PetscBTView(cEnd-cStart, flippedCells, v);
    478:     PetscViewerFlush(v);
    479:     PetscViewerASCIIPopSynchronized(v);
    480:   }
    481:   /* Reverse flipped cells in the mesh */
    482:   for (c = cStart; c < cEnd; ++c) {
    483:     if (PetscBTLookup(flippedCells, c-cStart)) {
    484:       DMPlexOrientPoint(dm, c, -1);
    485:     }
    486:   }
    487:   PetscBTDestroy(&seenCells);
    488:   PetscBTDestroy(&flippedCells);
    489:   PetscBTDestroy(&seenFaces);
    490:   PetscFree2(numNeighbors, neighbors);
    491:   PetscFree2(rorntComp, lorntComp);
    492:   PetscFree3(faceFIFO, cellComp, faceComp);
    493:   return 0;
    494: }