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87 lines
2.3 KiB
C
87 lines
2.3 KiB
C
/*
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* coarsen.c
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*
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* This file contains the driving routines for the coarsening process
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*
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* Started 7/23/97
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* George
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*
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* $Id: coarsen.c,v 1.2 2003/07/31 16:23:29 karypis Exp $
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*
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*/
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#include <metis.h>
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/*************************************************************************
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* This function takes a graph and creates a sequence of coarser graphs
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**************************************************************************/
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GraphType *Coarsen2Way(CtrlType *ctrl, GraphType *graph)
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{
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int clevel;
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GraphType *cgraph;
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IFSET(ctrl->dbglvl, DBG_TIME, starttimer(ctrl->CoarsenTmr));
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cgraph = graph;
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/* The following is ahack to allow the multiple bisections to go through with correct
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coarsening */
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if (ctrl->CType > 20) {
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clevel = 1;
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ctrl->CType -= 20;
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}
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else
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clevel = 0;
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do {
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IFSET(ctrl->dbglvl, DBG_COARSEN, printf("%6d %7d [%d] [%d %d]\n",
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cgraph->nvtxs, cgraph->nedges, ctrl->CoarsenTo, ctrl->maxvwgt,
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(cgraph->vwgt ? idxsum(cgraph->nvtxs, cgraph->vwgt) : cgraph->nvtxs)));
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if (cgraph->adjwgt) {
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switch (ctrl->CType) {
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case MATCH_RM:
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Match_RM(ctrl, cgraph);
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break;
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case MATCH_HEM:
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if (clevel < 1 || cgraph->nedges == 0)
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Match_RM(ctrl, cgraph);
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else
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Match_HEM(ctrl, cgraph);
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break;
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case MATCH_SHEM:
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if (clevel < 1 || cgraph->nedges == 0)
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Match_RM(ctrl, cgraph);
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else
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Match_SHEM(ctrl, cgraph);
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break;
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case MATCH_SHEMKWAY:
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if (cgraph->nedges == 0)
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Match_RM(ctrl, cgraph);
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else
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Match_SHEM(ctrl, cgraph);
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break;
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default:
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errexit("Unknown CType: %d\n", ctrl->CType);
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}
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}
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else {
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Match_RM_NVW(ctrl, cgraph);
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}
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cgraph = cgraph->coarser;
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clevel++;
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} while (cgraph->nvtxs > ctrl->CoarsenTo && cgraph->nvtxs < COARSEN_FRACTION2*cgraph->finer->nvtxs && cgraph->nedges > cgraph->nvtxs/2);
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IFSET(ctrl->dbglvl, DBG_COARSEN, printf("%6d %7d [%d] [%d %d]\n",
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cgraph->nvtxs, cgraph->nedges, ctrl->CoarsenTo, ctrl->maxvwgt,
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(cgraph->vwgt ? idxsum(cgraph->nvtxs, cgraph->vwgt) : cgraph->nvtxs)));
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IFSET(ctrl->dbglvl, DBG_TIME, stoptimer(ctrl->CoarsenTmr));
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return cgraph;
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}
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