parmetisloadbalancer.h

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/*
 *
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 *              ##   ##  ##   ##  ####    ####    ##  #  ##
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 *            ##   ##  ##   ##  ##      ##      ##     ##
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 *
 *
 *             OOFEM : Object Oriented Finite Element Code
 *
 *               Copyright (C) 1993 - 2025   Borek Patzak
 *
 *
 *
 *       Czech Technical University, Faculty of Civil Engineering,
 *   Department of Structural Mechanics, 166 29 Prague, Czech Republic
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This program 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */
 
#ifndef parmetisloadbalancer_h
#define parmetisloadbalancer_h
 
#include "loadbalancer.h"
#include "intarray.h"
 
#include <parmetis.h>
#include <vector>
 
#define _IFT_ParmetisLoadBalancer_Name "parmetis"
 
namespace oofem {
 #define PARMETISLB_END_DATA -1
 #define SHARED_DOFMAN_PARTITIONS_TAG 9998

class OOFEM_EXPORT ParmetisLoadBalancer : public LoadBalancer
{
protected:
    IntArray gToLMap, lToGMap;
    idx_t *elmdist;
    int myGlobNumOffset;
    real_t *tpwgts;
    IntArray dofManState;
    std :: vector< IntArray >dofManPartitions;
    IntArray elementPart;
 
public:
    ParmetisLoadBalancer(Domain * d);
    virtual ~ParmetisLoadBalancer();
 
    void calculateLoadTransfer() override;
 
 #if 1
    DofManMode giveDofManState(int idofman) override;
    IntArray *giveDofManPartitions(int idofman) override;
    int giveElementPartition(int ielem) override;
 #endif
protected:
    void handleMasterSlaveDofManLinks();
 
    void initGlobalParmetisElementNumbering();
    int  giveLocalElementNumber(int globnum) { return gToLMap.at(globnum - myGlobNumOffset); }
    int  giveGlobalElementNumber(int locnum) { return lToGMap.at(locnum); }

    void labelDofManagers();
    int  determineDofManState(int idofman, int myrank, int npart, IntArray *dofManPartitions);
 
    int packSharedDmanPartitions(ProcessCommunicator &pc);
    int unpackSharedDmanPartitions(ProcessCommunicator &pc);
    void addSharedDofmanPartitions(int _locnum, IntArray _partitions);
 
    const char *giveClassName() const override { return "ParmetisLoadBalancer"; }
};
} // end namespace oofem
 
#endif // parmetisloadbalancer_h