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Creation of OpenFOAM-dev repository 15/04/2008

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OpenFOAM-admin
2008-04-15 18:56:58 +01:00
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102
applications/utilities/parallelProcessing/decompositionMethods/metis-5.0pre2/libmetis/mrkmetis.c Normal file
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/*
* Copyright 1997, Regents of the University of Minnesota
*
* mrkmetis.c
*
* This file contains the top level routines for the multilevel k-way partitioning
* algorithm KMETIS.
*
* Started 7/28/97
* George
*
* $Id: mrkmetis.c,v 1.2 2003/04/04 23:25:10 karypis Exp $
*
*/
#include <metislib.h>
/*************************************************************************
* This function is the entry point for KWMETIS
**************************************************************************/
void METIS_mCRefineGraphKway(idxtype *nvtxs, idxtype *ncon, idxtype *xadj, idxtype *adjncy,
idxtype *vwgt, idxtype *adjwgt, idxtype *wgtflag, idxtype *numflag,
idxtype *nparts, float *rubvec, idxtype *options, idxtype *edgecut,
idxtype *part)
{
idxtype i, j;
GraphType graph;
CtrlType ctrl;
if (*numflag == 1)
Change2CNumbering(*nvtxs, xadj, adjncy);
SetUpGraph(&graph, OP_KMETIS, *nvtxs, *ncon, xadj, adjncy, vwgt, adjwgt, *wgtflag);
if (options[0] == 0) { /* Use the default parameters */
ctrl.CType = McKMETIS_CTYPE;
ctrl.IType = McKMETIS_ITYPE;
ctrl.RType = McKMETIS_RTYPE;
ctrl.dbglvl = McKMETIS_DBGLVL;
}
else {
ctrl.CType = options[OPTION_CTYPE];
ctrl.IType = options[OPTION_ITYPE];
ctrl.RType = options[OPTION_RTYPE];
ctrl.dbglvl = options[OPTION_DBGLVL];
}
ctrl.optype = OP_KMETIS;
ctrl.CoarsenTo = amax((*nvtxs)/(20*gk_log2(*nparts)), 30*(*nparts));
ctrl.nmaxvwgt = 0.0; /* GK-MOD: Ensure that no coarsening will take place */
InitRandom(-1);
AllocateWorkSpace(&ctrl, &graph, *nparts);
IFSET(ctrl.dbglvl, DBG_TIME, InitTimers(&ctrl));
IFSET(ctrl.dbglvl, DBG_TIME, gk_startcputimer(ctrl.TotalTmr));
*edgecut = MCMlevelKWayRefinement(&ctrl, &graph, *nparts, part, rubvec);
IFSET(ctrl.dbglvl, DBG_TIME, gk_stopcputimer(ctrl.TotalTmr));
IFSET(ctrl.dbglvl, DBG_TIME, PrintTimers(&ctrl));
FreeWorkSpace(&ctrl, &graph);
if (*numflag == 1)
Change2FNumbering(*nvtxs, xadj, adjncy, part);
}
/*************************************************************************
* This function takes a graph and produces a bisection of it
**************************************************************************/
idxtype MCMlevelKWayRefinement(CtrlType *ctrl, GraphType *graph, idxtype nparts, idxtype *part,
float *rubvec)
{
idxtype i, j, nvtxs;
GraphType *cgraph;
idxtype options[10], edgecut;
cgraph = MCCoarsen2Way(ctrl, graph);
IFSET(ctrl->dbglvl, DBG_TIME, gk_startcputimer(ctrl->InitPartTmr));
MocAllocateKWayPartitionMemory(ctrl, cgraph, nparts);
if (cgraph->nvtxs != graph->nvtxs)
errexit("GK-MOD Failed: %d %d\n", cgraph->nvtxs, graph->nvtxs);
for (i=0; i<graph->nvtxs; i++)
cgraph->where[graph->cmap[i]] = part[i];
MocRefineKWayHorizontal(ctrl, graph, cgraph, nparts, rubvec);
idxcopy(graph->nvtxs, graph->where, part);
FreeGraph(graph, 0);
return graph->mincut;
}