scotchDecomp.H

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/*---------------------------------------------------------------------------*\
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  \\      /  F ield         | OpenFOAM: The Open Source CFD Toolbox
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    \\  /    A nd           | Copyright (C) 2011-2015 OpenFOAM Foundation
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-------------------------------------------------------------------------------
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
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    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/>.
 
Class
    Foam::scotchDecomp
 
Description
    Scotch domain decomposition.
    When run in parallel will collect the whole graph on to the master,
    decompose and send back. Run ptscotchDecomp for proper distributed
    decomposition.
 
SourceFiles
    scotchDecomp.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef scotchDecomp_H
#define scotchDecomp_H
 
#include "decompositionMethod.H"
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                           Class scotchDecomp Declaration
\*---------------------------------------------------------------------------*/
 
class scotchDecomp
:
    public decompositionMethod
{
    // Private Member Functions
 
        //- Check and print error message
        static void check(const int, const char*);
 
        label decompose
        (
            const fileName& meshPath,
            const List<label>& adjncy,
            const List<label>& xadj,
            const scalarField& cWeights,
            List<label>& finalDecomp
        );
 
        //- Decompose non-parallel
        label decomposeOneProc
        (
            const fileName& meshPath,
            const List<label>& adjncy,
            const List<label>& xadj,
            const scalarField& cWeights,
            List<label>& finalDecomp
        );
 
        //- Disallow default bitwise copy construct and assignment
        void operator=(const scotchDecomp&);
        scotchDecomp(const scotchDecomp&);
 
 
public:
 
    //- Runtime type information
    TypeName("scotch");
 
 
    // Constructors
 
        //- Construct given the decomposition dictionary and mesh
        scotchDecomp(const dictionary& decompositionDict);
 
 
    //- Destructor
    virtual ~scotchDecomp()
    {}
 
 
    // Member Functions
 
        virtual bool parallelAware() const
        {
            // Knows about coupled boundaries
            return true;
        }
 
        //- Inherit decompose from decompositionMethod
        using decompositionMethod::decompose;
 
        //- Return for every coordinate the wanted processor number. Use the
        //  mesh connectivity (if needed)
        //  Weights get normalised with minimum weight and truncated to
        //  convert into integer so e.g. 3.5 is seen as 3. The overall sum
        //  of weights might otherwise overflow.
        virtual labelList decompose
        (
            const polyMesh& mesh,
            const pointField& points,
            const scalarField& pointWeights
        );
 
        //- Return for every coordinate the wanted processor number. Gets
        //  passed agglomeration map (from fine to coarse cells) and coarse cell
        //  location. Can be overridden by decomposers that provide this
        //  functionality natively.
        //  See note on weights above.
        virtual labelList decompose
        (
            const polyMesh& mesh,
            const labelList& agglom,
            const pointField& regionPoints,
            const scalarField& regionWeights
        );
 
        //- Return for every coordinate the wanted processor number. Explicitly
        //  provided mesh connectivity.
        //  The connectivity is equal to mesh.cellCells() except for
        //  - in parallel the cell numbers are global cell numbers (starting
        //    from 0 at processor0 and then incrementing all through the
        //    processors)
        //  - the connections are across coupled patches
        //  See note on weights above.
        virtual labelList decompose
        (
            const labelListList& globalCellCells,
            const pointField& cc,
            const scalarField& cWeights
        );
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //