/*************************************************************************
* This function is the entry point for KWMETIS with seed specification
* in options[7]
**************************************************************************/
void METIS_WPartGraphKway2(int *nvtxs, idxtype *xadj, idxtype *adjncy, idxtype *vwgt,
idxtype *adjwgt, int *wgtflag, int *numflag, int *nparts,
float *tpwgts, int *options, int *edgecut, idxtype *part)
{
int i, j;
GraphType graph;
CtrlType ctrl;
if (*numflag == 1)
Change2CNumbering(*nvtxs, xadj, adjncy);
SetUpGraph(&graph, OP_KMETIS, *nvtxs, 1, xadj, adjncy, vwgt, adjwgt, *wgtflag);
if (options[0] == 0) { /* Use the default parameters */
ctrl.CType = KMETIS_CTYPE;
ctrl.IType = KMETIS_ITYPE;
ctrl.RType = KMETIS_RTYPE;
ctrl.dbglvl = KMETIS_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 = 20*(*nparts);
ctrl.maxvwgt = 1.5*((graph.vwgt ? idxsum(*nvtxs, graph.vwgt) : (*nvtxs))/ctrl.CoarsenTo);
InitRandom(options[7]);
AllocateWorkSpace(&ctrl, &graph, *nparts);
IFSET(ctrl.dbglvl, DBG_TIME, InitTimers(&ctrl));
IFSET(ctrl.dbglvl, DBG_TIME, starttimer(ctrl.TotalTmr));
*edgecut = MlevelKWayPartitioning(&ctrl, &graph, *nparts, part, tpwgts, 1.000);
IFSET(ctrl.dbglvl, DBG_TIME, stoptimer(ctrl.TotalTmr));
IFSET(ctrl.dbglvl, DBG_TIME, PrintTimers(&ctrl));
FreeWorkSpace(&ctrl, &graph);
if (*numflag == 1)
Change2FNumbering(*nvtxs, xadj, adjncy, part);
}
int METIS_PartGraphKway(idx_t *nvtxs, idx_t *ncon, idx_t *xadj, idx_t *adjncy,
idx_t *vwgt, idx_t *vsize, idx_t *adjwgt, idx_t *nparts,
real_t *tpwgts, real_t *ubvec, idx_t *options, idx_t *objval,
idx_t *part)
{
int sigrval=0, renumber=0;
graph_t *graph;
ctrl_t *ctrl;
/* set up malloc cleaning code and signal catchers */
if (!gk_malloc_init())
return METIS_ERROR_MEMORY;
gk_sigtrap();
if ((sigrval = gk_sigcatch()) != 0)
goto SIGTHROW;
/* set up the run parameters */
ctrl = SetupCtrl(METIS_OP_KMETIS, options, *ncon, *nparts, tpwgts, ubvec);
if (!ctrl) {
gk_siguntrap();
return METIS_ERROR_INPUT;
}
/* if required, change the numbering to 0 */
if (ctrl->numflag == 1) {
Change2CNumbering(*nvtxs, xadj, adjncy);
renumber = 1;
}
/* set up the graph */
graph = SetupGraph(ctrl, *nvtxs, *ncon, xadj, adjncy, vwgt, vsize, adjwgt);
/* set up multipliers for making balance computations easier */
SetupKWayBalMultipliers(ctrl, graph);
/* set various run parameters that depend on the graph */
if (ctrl->iptype == METIS_IPTYPE_METISRB) {
ctrl->CoarsenTo = gk_max((*nvtxs)/(40*gk_log2(*nparts)), 30*(*nparts));
ctrl->CoarsenTo = 10*(*nparts);
ctrl->nIparts = (ctrl->CoarsenTo == 30*(*nparts) ? 4 : 5);
}
else {
ctrl->CoarsenTo = 10*(*nparts);
ctrl->nIparts = 10;
}
/* take care contiguity requests for disconnected graphs */
if (ctrl->contig && !IsConnected(graph, 0))
gk_errexit(SIGERR, "METIS Error: A contiguous partition is requested for a non-contiguous input graph.\n");
/* allocate workspace memory */
AllocateWorkSpace(ctrl, graph);
/* start the partitioning */
IFSET(ctrl->dbglvl, METIS_DBG_TIME, InitTimers(ctrl));
IFSET(ctrl->dbglvl, METIS_DBG_TIME, gk_startwctimer(ctrl->TotalTmr));
*objval = MlevelKWayPartitioning(ctrl, graph, part);
IFSET(ctrl->dbglvl, METIS_DBG_TIME, gk_stopwctimer(ctrl->TotalTmr));
IFSET(ctrl->dbglvl, METIS_DBG_TIME, PrintTimers(ctrl));
/* clean up */
FreeCtrl(&ctrl);
SIGTHROW:
/* if required, change the numbering back to 1 */
if (renumber)
Change2FNumbering(*nvtxs, xadj, adjncy, part);
gk_siguntrap();
gk_malloc_cleanup(0);
return metis_rcode(sigrval);
}
