128 lines
4.1 KiB
C
128 lines
4.1 KiB
C
/*
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* Copyright 1997, Regents of the University of Minnesota
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*
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* kmetis.c
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*
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* This file contains the top level routines for the multilevel k-way partitioning
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* algorithm KMETIS.
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*
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* Started 7/28/97
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* George
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*
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*/
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#include <metislib.h>
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/*************************************************************************
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* This function is the entry point for KMETIS
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**************************************************************************/
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void METIS_PartGraphKway(idxtype *nvtxs, idxtype *xadj, idxtype *adjncy, idxtype *vwgt,
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idxtype *adjwgt, idxtype *wgtflag, idxtype *numflag, idxtype *nparts,
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idxtype *options, idxtype *edgecut, idxtype *part)
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{
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idxtype i;
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float *tpwgts;
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tpwgts = gk_fmalloc(*nparts, "KMETIS: tpwgts");
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for (i=0; i<*nparts; i++)
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tpwgts[i] = 1.0/(1.0*(*nparts));
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METIS_WPartGraphKway(nvtxs, xadj, adjncy, vwgt, adjwgt, wgtflag, numflag, nparts,
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tpwgts, options, edgecut, part);
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gk_free((void **)&tpwgts, LTERM);
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}
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/*************************************************************************
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* This function is the entry point for KWMETIS
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**************************************************************************/
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void METIS_WPartGraphKway(idxtype *nvtxs, idxtype *xadj, idxtype *adjncy, idxtype *vwgt,
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idxtype *adjwgt, idxtype *wgtflag, idxtype *numflag, idxtype *nparts,
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float *tpwgts, idxtype *options, idxtype *edgecut, idxtype *part)
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{
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idxtype i, j;
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GraphType graph;
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CtrlType ctrl;
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if (*numflag == 1)
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Change2CNumbering(*nvtxs, xadj, adjncy);
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SetUpGraph(&graph, OP_KMETIS, *nvtxs, 1, xadj, adjncy, vwgt, adjwgt, *wgtflag);
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if (options[0] == 0) { /* Use the default parameters */
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ctrl.CType = KMETIS_CTYPE;
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ctrl.IType = KMETIS_ITYPE;
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ctrl.RType = KMETIS_RTYPE;
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ctrl.dbglvl = KMETIS_DBGLVL;
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}
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else {
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ctrl.CType = options[OPTION_CTYPE];
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ctrl.IType = options[OPTION_ITYPE];
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ctrl.RType = options[OPTION_RTYPE];
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ctrl.dbglvl = options[OPTION_DBGLVL];
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}
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ctrl.optype = OP_KMETIS;
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ctrl.CoarsenTo = amax((*nvtxs)/(40*gk_log2(*nparts)), 20*(*nparts));
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ctrl.maxvwgt = 1.5*((graph.vwgt ? idxsum(*nvtxs, graph.vwgt, 1) : (*nvtxs))/ctrl.CoarsenTo);
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InitRandom(-1);
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AllocateWorkSpace(&ctrl, &graph, *nparts);
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IFSET(ctrl.dbglvl, DBG_TIME, InitTimers(&ctrl));
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IFSET(ctrl.dbglvl, DBG_TIME, gk_startcputimer(ctrl.TotalTmr));
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*edgecut = MlevelKWayPartitioning(&ctrl, &graph, *nparts, part, tpwgts, 1.03);
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IFSET(ctrl.dbglvl, DBG_TIME, gk_stopcputimer(ctrl.TotalTmr));
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IFSET(ctrl.dbglvl, DBG_TIME, PrintTimers(&ctrl));
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FreeWorkSpace(&ctrl, &graph);
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if (*numflag == 1)
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Change2FNumbering(*nvtxs, xadj, adjncy, part);
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}
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/*************************************************************************
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* This function takes a graph and produces a bisection of it
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**************************************************************************/
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idxtype MlevelKWayPartitioning(CtrlType *ctrl, GraphType *graph, idxtype nparts, idxtype *part, float *tpwgts, float ubfactor)
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{
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idxtype i, j, nvtxs, tvwgt, tpwgts2[2];
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GraphType *cgraph;
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idxtype wgtflag=3, numflag=0, options[10], edgecut;
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cgraph = Coarsen2Way(ctrl, graph);
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IFSET(ctrl->dbglvl, DBG_TIME, gk_startcputimer(ctrl->InitPartTmr));
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AllocateKWayPartitionMemory(ctrl, cgraph, nparts);
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options[0] = 1;
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options[OPTION_CTYPE] = MTYPE_SHEMKWAY;
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options[OPTION_ITYPE] = ITYPE_GGPKL;
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options[OPTION_RTYPE] = RTYPE_FM;
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options[OPTION_DBGLVL] = 0;
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METIS_WPartGraphRecursive(&cgraph->nvtxs, cgraph->xadj, cgraph->adjncy, cgraph->vwgt,
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cgraph->adjwgt, &wgtflag, &numflag, &nparts, tpwgts, options,
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&edgecut, cgraph->where);
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IFSET(ctrl->dbglvl, DBG_TIME, gk_stopcputimer(ctrl->InitPartTmr));
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IFSET(ctrl->dbglvl, DBG_IPART, mprintf("Initial %D-way partitioning cut: %D\n", nparts, edgecut));
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IFSET(ctrl->dbglvl, DBG_KWAYPINFO, ComputePartitionInfo(cgraph, nparts, cgraph->where));
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RefineKWay(ctrl, graph, cgraph, nparts, tpwgts, ubfactor);
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idxcopy(graph->nvtxs, graph->where, part);
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FreeGraph(graph, 0);
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return graph->mincut;
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}
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