Metis.hpp

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///////////////////////////////////////////////////////////////////////////////
//
// File: Metis.hpp
//
// For more information, please see: http://www.nektar.info
//
// The MIT License
//
// Copyright (c) 2006 Division of Applied Mathematics, Brown University (USA),
// Department of Aeronautics, Imperial College London (UK), and Scientific
// Computing and Imaging Institute, University of Utah (USA).
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the "Software"),
// to deal in the Software without restriction, including without limitation
// the rights to use, copy, modify, merge, publish, distribute, sublicense,
// and/or sell copies of the Software, and to permit persons to whom the
// Software is furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
// THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
// FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.
//
// Description: wrapper of functions around METIS routines
//
///////////////////////////////////////////////////////////////////////////////
 
#ifndef NEKTAR_LIB_UTILITIES_BASICUTILS_METIS_HPP
#define NEKTAR_LIB_UTILITIES_BASICUTILS_METIS_HPP
 
#include <LibUtilities/BasicConst/NektarUnivTypeDefs.hpp>
#include <LibUtilities/BasicUtils/SharedArray.hpp>
 
#include <metis.h>
 
namespace Metis
{
inline static void PartGraphVKway(int &nVerts, int &nVertConds,
                                  Nektar::Array<Nektar::OneD, int> &xadj,
                                  Nektar::Array<Nektar::OneD, int> &adjcy,
                                  Nektar::Array<Nektar::OneD, int> &vertWgt,
                                  Nektar::Array<Nektar::OneD, int> &vertSize,
                                  Nektar::Array<Nektar::OneD, int> &edgeWgt,
                                  int &nparts, int &volume,
                                  Nektar::Array<Nektar::OneD, int> &part)
{
    int *vwgt   = nullptr;
    int *vsize  = nullptr;
    int *adjwgt = nullptr;
    if (vertWgt.size() > 0)
    {
        vwgt = &vertWgt[0];
    }
    if (vertSize.size() > 0)
    {
        vsize = &vertSize[0];
    }
    if (edgeWgt.size() > 0)
    {
        adjwgt = &edgeWgt[0];
    }
    // number of balancing conditions (size of vertex multi-weight)
    int ncon = nVertConds;
    int options[METIS_NOPTIONS];
    METIS_SetDefaultOptions(options);
    METIS_PartGraphKway(&nVerts, &ncon, &xadj[0], &adjcy[0], vwgt, vsize,
                        adjwgt, &nparts, nullptr, nullptr, options, &volume,
                        &part[0]);
}
} // namespace Metis
#endif // NEKTAR_LIB_UTILITIES_BASICUTILS_METIS_HPP