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========= |
\\ / F ield | OpenFOAM: The Open Source CFD Toolbox
\\ / O peration | Website: https://openfoam.org
\\ / A nd | Copyright (C) 2011-2026 OpenFOAM Foundation
\\/ M anipulation |
-------------------------------------------------------------------------------
License
This file is part of OpenFOAM.
OpenFOAM is free software: you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
OpenFOAM is distributed in the hope that it will be useful, but WITHOUT
ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
for more details.
You should have received a copy of the GNU General Public License
along with OpenFOAM. If not, see <http://www.gnu.org/licenses/>.
\*---------------------------------------------------------------------------*/
#include "decompositionMethod.H"
#include "Time.H"
#include "globalIndex.H"
#include "syncTools.H"
#include "Tuple2.H"
#include "faceSet.H"
#include "regionSplit.H"
#include "localPointRegion.H"
#include "minData.H"
#include "FaceCellWave.H"
// * * * * * * * * * * * * * * Static Data Members * * * * * * * * * * * * * //
namespace Foam
{
defineTypeNameAndDebug(decompositionMethod, 0);
defineRunTimeSelectionTable(decompositionMethod, decomposer);
defineRunTimeSelectionTable(decompositionMethod, distributor);
}
// * * * * * * * * * * * * * Protected Member Functions * * * * * * * * * * //
Foam::label Foam::decompositionMethod::nWeights
(
const pointField& points,
const scalarField& pointWeights
) const
{
const label localnWeights =
points.size() ? pointWeights.size()/points.size() : 0;
const label nWeights = returnReduce(localnWeights, maxOp());
if (localnWeights && localnWeights != nWeights)
{
FatalErrorInFunction
<< "Number of weights on this processor " << localnWeights
<< " does not equal the maximum number of weights " << nWeights
<< exit(FatalError);
}
return nWeights;
}
Foam::label Foam::decompositionMethod::checkWeights
(
const pointField& points,
const scalarField& pointWeights
) const
{
const label nWeights = this->nWeights(points, pointWeights);
if (nWeights > 1)
{
FatalErrorInFunction
<< "decompositionMethod " << type()
<< " does not support multiple constraints"
<< exit(FatalError);
}
return nWeights;
}
// * * * * * * * * * * * * * * * * Constructors * * * * * * * * * * * * * * //
Foam::decompositionMethod::decompositionMethod
(
const dictionary& decompositionDict
)
:
nProcessors_(decompositionDict.lookup<label>("numberOfSubdomains"))
{
// Read any constraints
wordList constraintTypes_;
if (decompositionDict.found("constraints"))
{
const dictionary& constraintsList = decompositionDict.subDict
(
"constraints"
);
forAllConstIter(dictionary, constraintsList, iter)
{
const dictionary& dict = iter().dict();
constraintTypes_.append(dict.lookup("type"));
constraints_.append
(
decompositionConstraint::New
(
dict,
constraintTypes_.last()
)
);
}
}
}
// * * * * * * * * * * * * * * * Member Functions * * * * * * * * * * * * * //
Foam::autoPtr<Foam::decompositionMethod>
Foam::decompositionMethod::NewDecomposer
(
const dictionary& decompositionDict
)
{
const word methodType
(
decompositionDict.lookupBackwardsCompatible<word>
(
{"decomposer", "method"}
)
);
Info<< indentOrNl << "Selecting decomposer " << methodType << endl;
libs.open
(
decompositionDict,
"libs",
decomposerConstructorTablePtr_
);
decomposerConstructorTable::iterator cstrIter =
decomposerConstructorTablePtr_->find(methodType);
if (cstrIter == decomposerConstructorTablePtr_->end())
{
FatalErrorInFunction
<< "Unknown decomposer "
<< methodType << nl << nl
<< "Valid decomposers are : " << endl
<< decomposerConstructorTablePtr_->sortedToc()
<< exit(FatalError);
}
Info<< incrIndent;
autoPtr<decompositionMethod> methodPtr
(
cstrIter()
(
decompositionDict,
decompositionDict.typeOrEmptyDict(methodType)
)
);
Info<< decrIndent;
return methodPtr;
}
Foam::autoPtr<Foam::decompositionMethod>
Foam::decompositionMethod::NewDistributor
(
const dictionary& distributionDict
)
{
const word methodType
(
distributionDict.lookupBackwardsCompatible<word>
(
{"distributor", "method"}
)
);
Info<< indentOrNl << "Selecting distributor " << methodType << endl;
libs.open
(
distributionDict,
"libs",
distributorConstructorTablePtr_
);
distributorConstructorTable::iterator cstrIter =
distributorConstructorTablePtr_->find(methodType);
if (cstrIter == distributorConstructorTablePtr_->end())
{
FatalErrorInFunction
<< "Unknown distributor "
<< methodType << nl << nl
<< "Valid distributors are : " << endl
<< distributorConstructorTablePtr_->sortedToc()
<< exit(FatalError);
}
Info<< incrIndent;
autoPtr<decompositionMethod> methodPtr
(
cstrIter()
(
distributionDict,
distributionDict.typeOrEmptyDict(methodType)
)
);
Info<< decrIndent;
return methodPtr;
}
Foam::IOdictionary Foam::decompositionMethod::decomposeParDict(const Time& time)
{
return IOdictionary
(
IOobject
(
"decomposeParDict",
time.system(),
time,
IOobject::MUST_READ,
IOobject::NO_WRITE,
false
)
);
}
Foam::labelList Foam::decompositionMethod::decompose
(
const polyMesh& mesh,
const pointField& points
)
{
scalarField weights(points.size(), 1.0);
return decompose(mesh, points, weights);
}
Foam::labelList Foam::decompositionMethod::decompose
(
const polyMesh& mesh,
const labelList& fineToCoarse,
const pointField& coarsePoints,
const scalarField& coarseWeights
)
{
CompactListList<label> coarseCellCells;
calcCellCells
(
mesh,
fineToCoarse,
coarsePoints.size(),
true, // use global cell labels
coarseCellCells
);
// Decompose based on agglomerated points
labelList coarseDistribution
(
decompose
(
coarseCellCells.list(),
coarsePoints,
coarseWeights
)
);
// Rework back into decomposition for original mesh_
labelList fineDistribution(fineToCoarse.size());
forAll(fineDistribution, i)
{
fineDistribution[i] = coarseDistribution[fineToCoarse[i]];
}
return fineDistribution;
}
Foam::labelList Foam::decompositionMethod::decompose
(
const polyMesh& mesh,
const labelList& fineToCoarse,
const pointField& coarsePoints
)
{
scalarField cellWeights(coarsePoints.size(), 1.0);
return decompose
(
mesh,
fineToCoarse,
coarsePoints,
cellWeights
);
}
Foam::labelList Foam::decompositionMethod::decompose
(
const labelListList& globalCellCells,
const pointField& cellCentres
)
{
scalarField cellWeights(cellCentres.size(), 1.0);
return decompose(globalCellCells, cellCentres, cellWeights);
}
Foam::labelList Foam::decompositionMethod::scaleWeights
(
const scalarField& weights,
label& nWeights,
const bool distributed
)
{
labelList intWeights;
if (nWeights > 0)
{
// Calculate the scalar -> integer scaling factor
const scalar sumWeights
(
distributed
? gSum(weights)
: sum(weights)
);
// Hack for scotch which does not accept 64bit label range for weights
const scalar scale = INT32_MAX/(2*sumWeights);
// const scalar scale = labelMax/(2*sumWeights);
// Convert weights to integer
intWeights.setSize(weights.size());
forAll(intWeights, i)
{
intWeights[i] = ceil(scale*weights[i]);
}
/*
// Alternatively calculate a separate scaling factor
// for each weight, it is not clear from the parMETIS or Scotch manuals
// which method should be used.
//
// Calculate the scalar -> integer scaling factors
scalarList sumWeights(nWeights, 0.0);
forAll(weights, i)
{
sumWeights[i % nWeights] += weights[i];
}
if (distributed)
{
reduce(sumWeights, ListOp<sumOp>());
}
scalarList scale(nWeights, 0.0);
forAll(scale, i)
{
if (sumWeights[i] > small)
{
scale[i] = labelMax/(2*sumWeights[i]);
}
}
// Convert weights to integer
intWeights.setSize(weights.size());
forAll(intWeights, i)
{
intWeights[i] = ceil(scale[i % nWeights]*weights[i]);
}
*/
// Calculate the sum over all processors of each weight
labelList sumIntWeights(nWeights, 0);
forAll(weights, i)
{
sumIntWeights[i % nWeights] += intWeights[i];
}
if (distributed)
{
reduce(sumIntWeights, ListOp<sumOp>());
}
// Check that the sum of each weight is non-zero
boolList nonZeroWeights(nWeights, false);
label nNonZeroWeights = 0;
forAll(sumIntWeights, i)
{
if (sumIntWeights[i] != 0)
{
nonZeroWeights[i] = true;
nNonZeroWeights++;
}
}
// If there are zero weights remove them from the weights list
if (nNonZeroWeights != nWeights)
{
label j = 0;
forAll(intWeights, i)
{
if (nonZeroWeights[i % nWeights])
{
intWeights[j++] = intWeights[i];
}
}
// Resize the weights list
intWeights.setSize(nNonZeroWeights*(intWeights.size()/nWeights));
// Reset the number of weight to the number of non-zero weights
nWeights = nNonZeroWeights;
}
}
return intWeights;
}
void Foam::decompositionMethod::calcCellCells
(
const polyMesh& mesh,
const labelList& agglom,
const label nLocalCoarse,
const bool parallel,
CompactListList<label>& cellCells
)
{
const labelList& faceOwner = mesh.faceOwner();
const labelList& faceNeighbour = mesh.faceNeighbour();
const polyBoundaryMesh& patches = mesh.boundary();
// Create global cell numbers
// ~~~~~~~~~~~~~~~~~~~~~~~~~~
globalIndex globalAgglom
(
nLocalCoarse,
Pstream::msgType(),
Pstream::worldComm,
parallel
);
// Get agglomerate owner on other side of coupled faces
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
labelList globalNeighbour(mesh.nFaces() - mesh.nInternalFaces());
forAll(patches, patchi)
{
const polyPatch& pp = patches[patchi];
if (pp.coupled() && (parallel || !isA<processorPolyPatch>(pp)))
{
label facei = pp.start();
label bFacei = pp.start() - mesh.nInternalFaces();
forAll(pp, i)
{
globalNeighbour[bFacei] = globalAgglom.toGlobal
(
agglom[faceOwner[facei]]
);
bFacei++;
facei++;
}
}
}
// Get the cell on the other side of coupled patches
syncTools::swapBoundaryFaceList(mesh, globalNeighbour);
// Count number of faces (internal + coupled)
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Number of faces per coarse cell
labelList nFacesPerCell(nLocalCoarse, 0);
for (label facei = 0; facei < mesh.nInternalFaces(); facei++)
{
label own = agglom[faceOwner[facei]];
label nei = agglom[faceNeighbour[facei]];
nFacesPerCell[own]++;
nFacesPerCell[nei]++;
}
forAll(patches, patchi)
{
const polyPatch& pp = patches[patchi];
if (pp.coupled() && (parallel || !isA<processorPolyPatch>(pp)))
{
label facei = pp.start();
label bFacei = pp.start() - mesh.nInternalFaces();
forAll(pp, i)
{
label own = agglom[faceOwner[facei]];
label globalNei = globalNeighbour[bFacei];
if
(
!globalAgglom.isLocal(globalNei)
|| globalAgglom.toLocal(globalNei) != own
)
{
nFacesPerCell[own]++;
}
facei++;
bFacei++;
}
}
}
// Fill in offset and data
// ~~~~~~~~~~~~~~~~~~~~~~~
cellCells.setSize(nFacesPerCell);
nFacesPerCell = 0;
labelUList& m = cellCells.m();
const labelList& offsets = cellCells.offsets();
// For internal faces is just offsetted owner and neighbour
for (label facei = 0; facei < mesh.nInternalFaces(); facei++)
{
label own = agglom[faceOwner[facei]];
label nei = agglom[faceNeighbour[facei]];
m[offsets[own] + nFacesPerCell[own]++] = globalAgglom.toGlobal(nei);
m[offsets[nei] + nFacesPerCell[nei]++] = globalAgglom.toGlobal(own);
}
// For boundary faces is offsetted coupled neighbour
forAll(patches, patchi)
{
const polyPatch& pp = patches[patchi];
if (pp.coupled() && (parallel || !isA<processorPolyPatch>(pp)))
{
label facei = pp.start();
label bFacei = pp.start() - mesh.nInternalFaces();
forAll(pp, i)
{
label own = agglom[faceOwner[facei]];
label globalNei = globalNeighbour[bFacei];
if
(
!globalAgglom.isLocal(globalNei)
|| globalAgglom.toLocal(globalNei) != own
)
{
m[offsets[own] + nFacesPerCell[own]++] = globalNei;
}
facei++;
bFacei++;
}
}
}
// Check for duplicates connections between cells
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Done as postprocessing step since we now have cellCells.
label newIndex = 0;
labelHashSet nbrCells;
if (cellCells.size() == 0)
{
return;
}
label startIndex = cellCells.offsets()[0];
forAll(cellCells, celli)
{
nbrCells.clear();
nbrCells.insert(globalAgglom.toGlobal(celli));
label endIndex = cellCells.offsets()[celli+1];
for (label i = startIndex; i < endIndex; i++)
{
if (nbrCells.insert(cellCells.m()[i]))
{
cellCells.m()[newIndex++] = cellCells.m()[i];
}
}
startIndex = endIndex;
cellCells.offsets()[celli+1] = newIndex;
}
cellCells.setSize(cellCells.size(), newIndex);
}
void Foam::decompositionMethod::calcCellCells
(
const polyMesh& mesh,
const labelList& agglom,
const label nLocalCoarse,
const bool parallel,
CompactListList<label>& cellCells,
CompactListList<scalar>& cellCellWeights
)
{
const labelList& faceOwner = mesh.faceOwner();
const labelList& faceNeighbour = mesh.faceNeighbour();
const polyBoundaryMesh& patches = mesh.boundary();
// Create global cell numbers
// ~~~~~~~~~~~~~~~~~~~~~~~~~~
globalIndex globalAgglom
(
nLocalCoarse,
Pstream::msgType(),
Pstream::worldComm,
parallel
);
// Get agglomerate owner on other side of coupled faces
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
labelList globalNeighbour(mesh.nFaces() - mesh.nInternalFaces());
forAll(patches, patchi)
{
const polyPatch& pp = patches[patchi];
if (pp.coupled() && (parallel || !isA<processorPolyPatch>(pp)))
{
label faceI = pp.start();
label bFaceI = pp.start() - mesh.nInternalFaces();
forAll(pp, i)
{
globalNeighbour[bFaceI] = globalAgglom.toGlobal
(
agglom[faceOwner[faceI]]
);
bFaceI++;
faceI++;
}
}
}
// Get the cell on the other side of coupled patches
syncTools::swapBoundaryFaceList(mesh, globalNeighbour);
// Count number of faces (internal + coupled)
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Number of faces per coarse cell
labelList nFacesPerCell(nLocalCoarse, 0);
for (label faceI = 0; faceI < mesh.nInternalFaces(); faceI++)
{
label own = agglom[faceOwner[faceI]];
label nei = agglom[faceNeighbour[faceI]];
nFacesPerCell[own]++;
nFacesPerCell[nei]++;
}
forAll(patches, patchi)
{
const polyPatch& pp = patches[patchi];
if (pp.coupled() && (parallel || !isA<processorPolyPatch>(pp)))
{
label faceI = pp.start();
label bFaceI = pp.start()-mesh.nInternalFaces();
forAll(pp, i)
{
label own = agglom[faceOwner[faceI]];
label globalNei = globalNeighbour[bFaceI];
if
(
!globalAgglom.isLocal(globalNei)
|| globalAgglom.toLocal(globalNei) != own
)
{
nFacesPerCell[own]++;
}
faceI++;
bFaceI++;
}
}
}
// Fill in offset and data
// ~~~~~~~~~~~~~~~~~~~~~~~
cellCells.setSize(nFacesPerCell);
cellCellWeights.setSize(nFacesPerCell);
nFacesPerCell = 0;
labelUList& m = cellCells.m();
scalarUList& w = cellCellWeights.m();
const labelList& offsets = cellCells.offsets();
// For internal faces is just offsetted owner and neighbour
for (label faceI = 0; faceI < mesh.nInternalFaces(); faceI++)
{
label own = agglom[faceOwner[faceI]];
label nei = agglom[faceNeighbour[faceI]];
label ownIndex = offsets[own] + nFacesPerCell[own]++;
label neiIndex = offsets[nei] + nFacesPerCell[nei]++;
m[ownIndex] = globalAgglom.toGlobal(nei);
w[ownIndex] = mesh.magFaceAreas()[faceI];
m[neiIndex] = globalAgglom.toGlobal(own);
w[ownIndex] = mesh.magFaceAreas()[faceI];
}
// For boundary faces is offsetted coupled neighbour
forAll(patches, patchi)
{
const polyPatch& pp = patches[patchi];
if (pp.coupled() && (parallel || !isA<processorPolyPatch>(pp)))
{
label faceI = pp.start();
label bFaceI = pp.start()-mesh.nInternalFaces();
forAll(pp, i)
{
label own = agglom[faceOwner[faceI]];
label globalNei = globalNeighbour[bFaceI];
if
(
!globalAgglom.isLocal(globalNei)
|| globalAgglom.toLocal(globalNei) != own
)
{
label ownIndex = offsets[own] + nFacesPerCell[own]++;
m[ownIndex] = globalNei;
w[ownIndex] = mesh.magFaceAreas()[faceI];
}
faceI++;
bFaceI++;
}
}
}
// Check for duplicates connections between cells
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// Done as postprocessing step since we now have cellCells.
label newIndex = 0;
labelHashSet nbrCells;
if (cellCells.size() == 0)
{
return;
}
label startIndex = cellCells.offsets()[0];
forAll(cellCells, cellI)
{
nbrCells.clear();
nbrCells.insert(globalAgglom.toGlobal(cellI));
label endIndex = cellCells.offsets()[cellI+1];
for (label i = startIndex; i < endIndex; i++)
{
if (nbrCells.insert(cellCells.m()[i]))
{
cellCells.m()[newIndex] = cellCells.m()[i];
cellCellWeights.m()[newIndex] = cellCellWeights.m()[i];
newIndex++;
}
}
startIndex = endIndex;
cellCells.offsets()[cellI+1] = newIndex;
cellCellWeights.offsets()[cellI+1] = newIndex;
}
cellCells.setSize(cellCells.size(), newIndex);
cellCellWeights.setSize(cellCells.size(), newIndex);
}
Foam::labelList Foam::decompositionMethod::decompose
(
const polyMesh& mesh,
const scalarField& cellWeights,
const boolList& blockedFace,
const PtrList<labelList>& specifiedProcessorFaces,
const labelList& specifiedProcessor,
const List<labelPair>& explicitConnections
)
{
// Any weights specified?
const bool hasWeights =
returnReduce(cellWeights.size(), sumOp()) > 0;
// Any processor sets?
label nProcSets = 0;
forAll(specifiedProcessorFaces, setI)
{
nProcSets += specifiedProcessorFaces[setI].size();
}
reduce(nProcSets, sumOp());
// Any non-mesh connections?
label nConnections = returnReduce
(
explicitConnections.size(),
sumOp()
);
// Any faces not blocked?
label nUnblocked = 0;
forAll(blockedFace, facei)
{
if (!blockedFace[facei])
{
nUnblocked++;
}
}
reduce(nUnblocked, sumOp());
// Either do decomposition on cell centres or on agglomeration
labelList finalDecomp;
if (nProcSets+nConnections+nUnblocked == 0)
{
// No constraints, possibly weights
if (hasWeights)
{
finalDecomp = decompose
(
mesh,
mesh.cellCentres(),
cellWeights
);
}
else
{
finalDecomp = decompose(mesh, mesh.cellCentres());
}
}
else
{
if (debug)
{
Info<< "Constrained decomposition:" << endl
<< " faces with same owner and neighbour processor : "
<< nUnblocked << endl
<< " baffle faces with same owner processor : "
<< nConnections << endl
<< " faces all on same processor : "
<< nProcSets << endl << endl;
}
// Determine local regions, separated by blockedFaces
regionSplit localRegion(mesh, blockedFace, explicitConnections, false);
if (debug)
{
Info<< "Constrained decomposition:" << endl
<< " split into " << localRegion.nRegions()
<< " regions."
<< endl;
}
// Determine region cell centres
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
// This just takes the first cell in the region. Otherwise the problem
// is with cyclics - if we'd average the region centre might be
// somewhere in the middle of the domain which might not be anywhere
// near any of the cells.
pointField regionCentres(localRegion.nRegions(), point::max);
forAll(localRegion, celli)
{
label regionI = localRegion[celli];
if (regionCentres[regionI] == point::max)
{
regionCentres[regionI] = mesh.cellCentres()[celli];
}
}
// Do decomposition on agglomeration
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
scalarField regionWeights(localRegion.nRegions(), 0);
if (hasWeights)
{
forAll(localRegion, celli)
{
const label regionI = localRegion[celli];
regionWeights[regionI] += cellWeights[celli];
}
}
else
{
forAll(localRegion, celli)
{
label regionI = localRegion[celli];
regionWeights[regionI] += 1.0;
}
}
finalDecomp = decompose
(
mesh,
localRegion,
regionCentres,
regionWeights
);
// Implement the explicitConnections since above decompose
// does not know about them
forAll(explicitConnections, i)
{
const labelPair& baffle = explicitConnections[i];
label f0 = baffle.first();
label f1 = baffle.second();
if (!blockedFace[f0] && !blockedFace[f1])
{
// Note: what if internal faces and owner and neighbour on
// different processor? So for now just push owner side
// proc
const label proci = finalDecomp[mesh.faceOwner()[f0]];
finalDecomp[mesh.faceOwner()[f1]] = proci;
if (mesh.isInternalFace(f1))
{
finalDecomp[mesh.faceNeighbour()[f1]] = proci;
}
}
else if (blockedFace[f0] != blockedFace[f1])
{
FatalErrorInFunction
<< "On explicit connection between faces " << f0
<< " and " << f1
<< " the two blockedFace status are not equal : "
<< blockedFace[f0] << " and " << blockedFace[f1]
<< exit(FatalError);
}
}
// blockedFaces corresponding to processor faces need to be handled
// separately since not handled by local regionSplit. We need to
// walk now across coupled faces and make sure to move a whole
// global region across
if (Pstream::parRun())
{
// Re-do regionSplit
// Field on cells and faces.
List<minData> cellData(mesh.nCells());
List<minData> faceData(mesh.nFaces());
// Take over blockedFaces by seeding a negative number
// (so is always less than the decomposition)
label nUnblocked = 0;
forAll(blockedFace, facei)
{
if (blockedFace[facei])
{
faceData[facei] = minData(-123);
}
else
{
nUnblocked++;
}
}
// Seed unblocked faces with destination processor
labelList seedFaces(nUnblocked);
List<minData> seedData(nUnblocked);
nUnblocked = 0;
forAll(blockedFace, facei)
{
if (!blockedFace[facei])
{
label own = mesh.faceOwner()[facei];
seedFaces[nUnblocked] = facei;
seedData[nUnblocked] = minData(finalDecomp[own]);
nUnblocked++;
}
}
// Propagate information inwards
FaceCellWave<minData> deltaCalc
(
mesh,
seedFaces,
seedData,
faceData,
cellData,
mesh.globalData().nTotalCells()+1
);
// And extract
forAll(finalDecomp, celli)
{
if (cellData[celli].valid(deltaCalc.data()))
{
finalDecomp[celli] = cellData[celli].data();
}
}
}
// For specifiedProcessorFaces rework the cellToProc to enforce
// all on one processor since we can't guarantee that the input
// to regionSplit was a single region.
// E.g. faceSet 'a' with the cells split into two regions
// by a notch formed by two walls
//
// \ /
// \ /
// ---a----+-----a-----
//
//
// Note that reworking the cellToProc might make the decomposition
// unbalanced.
forAll(specifiedProcessorFaces, setI)
{
const labelList& set = specifiedProcessorFaces[setI];
label proci = specifiedProcessor[setI];
if (proci == -1)
{
// If no processor specified use the one from the
// 0th element
proci = set.size() ? finalDecomp[mesh.faceOwner()[set[0]]] : -1;
}
forAll(set, fI)
{
const face& f = mesh.faces()[set[fI]];
forAll(f, fp)
{
const labelList& pFaces = mesh.pointFaces()[f[fp]];
forAll(pFaces, i)
{
label facei = pFaces[i];
finalDecomp[mesh.faceOwner()[facei]] = proci;
if (mesh.isInternalFace(facei))
{
finalDecomp[mesh.faceNeighbour()[facei]] = proci;
}
}
}
}
}
if (debug && Pstream::parRun())
{
labelList nbrDecomp;
syncTools::swapBoundaryCellList(mesh, finalDecomp, nbrDecomp);
const polyBoundaryMesh& patches = mesh.boundary();
forAll(patches, patchi)
{
const polyPatch& pp = patches[patchi];
if (pp.coupled())
{
forAll(pp, i)
{
label facei = pp.start()+i;
label own = mesh.faceOwner()[facei];
label bFacei = facei-mesh.nInternalFaces();
if (!blockedFace[facei])
{
label ownProc = finalDecomp[own];
label nbrProc = nbrDecomp[bFacei];
if (ownProc != nbrProc)
{
FatalErrorInFunction
<< "patch:" << pp.name()
<< " face:" << facei
<< " at:" << mesh.faceCentres()[facei]
<< " ownProc:" << ownProc
<< " nbrProc:" << nbrProc
<< exit(FatalError);
}
}
}
}
}
}
}
return finalDecomp;
}
void Foam::decompositionMethod::setConstraints
(
const polyMesh& mesh,
boolList& blockedFace,
PtrList<labelList>& specifiedProcessorFaces,
labelList& specifiedProcessor,
List<labelPair>& explicitConnections
)
{
blockedFace.setSize(mesh.nFaces());
blockedFace = true;
specifiedProcessorFaces.clear();
explicitConnections.clear();
forAll(constraints_, constraintI)
{
constraints_[constraintI].add
(
mesh,
blockedFace,
specifiedProcessorFaces,
specifiedProcessor,
explicitConnections
);
}
}
void Foam::decompositionMethod::applyConstraints
(
const polyMesh& mesh,
const boolList& blockedFace,
const PtrList<labelList>& specifiedProcessorFaces,
const labelList& specifiedProcessor,
const List<labelPair>& explicitConnections,
labelList& decomposition
)
{
forAll(constraints_, constraintI)
{
constraints_[constraintI].apply
(
mesh,
blockedFace,
specifiedProcessorFaces,
specifiedProcessor,
explicitConnections,
decomposition
);
}
}
Foam::labelList Foam::decompositionMethod::decompose
(
const polyMesh& mesh,
const scalarField& cellWeights
)
{
// Collect all constraints
boolList blockedFace;
PtrList<labelList> specifiedProcessorFaces;
labelList specifiedProcessor;
List<labelPair> explicitConnections;
setConstraints
(
mesh,
blockedFace,
specifiedProcessorFaces,
specifiedProcessor,
explicitConnections
);
// Construct decomposition method and either do decomposition on
// cell centres or on agglomeration
labelList finalDecomp = decompose
(
mesh,
cellWeights, // optional weights
blockedFace, // any cells to be combined
specifiedProcessorFaces,// any whole cluster of cells to be kept
specifiedProcessor,
explicitConnections // baffles
);
// Give any constraint the option of modifying the decomposition
applyConstraints
(
mesh,
blockedFace,
specifiedProcessorFaces,
specifiedProcessor,
explicitConnections,
finalDecomp
);
return finalDecomp;
}
// ************************************************************************* //
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