randomDecomp.H

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    Copyright (C) 2019-2021 OpenCFD Ltd.
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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
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Class
    Foam::randomDecomp
 
Description
    Decomposition according to pseudo-random number generator,
    which is useful for development and stress testing implementations
    but obviously sub-optimal for normal uses.
    Can optionally specify the number of consecutive cells to assign
    to the same processor (agglomeration).
 
    Coefficients:
    \table
        Property  | Description                             | Required | Default
        agglom    | Number of cells to agglomerate          | no  | 1
    \endtable
 
SourceFiles
    randomDecomp.C
 
\*---------------------------------------------------------------------------*/
 
#ifndef Foam_randomDecomp_H
#define Foam_randomDecomp_H
 
#include "decompositionMethod.H"
 
namespace Foam
{
 
/*---------------------------------------------------------------------------*\
                        Class randomDecomp Declaration
\*---------------------------------------------------------------------------*/
 
class randomDecomp
:
    public decompositionMethod
{
    // Private Data
 
        //- Number of cells to agglomerate per random value (default: 1)
        label agglom_;
 
 
    // Private Member Functions
 
        //- Random distribution on the 0-nCells interval
        labelList randomMap(const label nCells) const;
 
        //- No copy construct
        void operator=(const randomDecomp&) = delete;
 
        //- No copy assignment
        randomDecomp(const randomDecomp&) = delete;
 
 
public:
 
    //- Runtime type information
    TypeNameNoDebug("random");
 
 
    // Constructors
 
        //- Construct for decomposition dictionary and optional region name
        explicit randomDecomp
        (
            const dictionary& decompDict,
            const word& regionName = "",
            int select = selectionType::DEFAULT
        );
 
 
    //- Destructor
    virtual ~randomDecomp() = default;
 
 
    // Member Functions
 
        //- Does not care about proc boundaries
        virtual bool parallelAware() const
        {
            return true;
        }
 
 
    // No topology (implemented by geometric decomposers)
 
        //- Return for every coordinate the wanted processor number.
        virtual labelList decompose
        (
            const pointField& points,
            const scalarField& pointWeights
        ) const;
 
        //- Decompose with uniform weights on the points
        virtual labelList decompose(const pointField& points) const;
 
        //- Return for every coordinate the wanted processor number.
        virtual labelList decompose
        (
            const polyMesh& mesh,
            const pointField& cc,
            const scalarField& cWeights
        ) const;
 
        //- Return for every coordinate the wanted processor number.
        //  Explicitly provided connectivity - does not use mesh_.
        virtual labelList decompose
        (
            const labelListList& globalCellCells,
            const pointField& cc,
            const scalarField& cWeights
        ) const;
};
 
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
} // End namespace Foam
 
// * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * //
 
#endif
 
// ************************************************************************* //