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/*
* Copyright 1998, Regents of the University of Minnesota
*
* tstadpt.c
*
* This file contains code for testing teh adaptive partitioning routines
*
* Started 5/19/97
* George
*
* $Id: adaptgraph.c,v 1.2 2003/07/21 17:50:22 karypis Exp $
*
*/
#include <parmetisbin.h>
/*************************************************************************
* This function implements a simple graph adaption strategy.
**************************************************************************/
void AdaptGraph(GraphType *graph, int afactor, MPI_Comm comm)
{
int i, nvtxs, nadapt, firstvtx, lastvtx;
int npes, mype, mypwgt, max, min, sum;
idxtype *vwgt, *xadj, *adjncy, *adjwgt, *perm;
MPI_Comm_size(comm, &npes);
MPI_Comm_rank(comm, &mype);
srand(mype*afactor);
srand48(mype*afactor);
nvtxs = graph->nvtxs;
xadj = graph->xadj;
adjncy = graph->adjncy;
if (graph->adjwgt == NULL)
adjwgt = graph->adjwgt = idxsmalloc(graph->nedges, 1, "AdaptGraph: adjwgt");
else
adjwgt = graph->adjwgt;
vwgt = graph->vwgt;
firstvtx = graph->vtxdist[mype];
lastvtx = graph->vtxdist[mype+1];
perm = idxmalloc(nvtxs, "AdaptGraph: perm");
FastRandomPermute(nvtxs, perm, 1);
nadapt = RandomInRange(nvtxs);
nadapt = RandomInRange(nvtxs);
nadapt = RandomInRange(nvtxs);
for (i=0; i<nadapt; i++)
vwgt[perm[i]] = afactor*vwgt[perm[i]];
/*
for (i=0; i<nvtxs; i++) {
for (j=xadj[i]; j<xadj[i+1]; j++) {
k = adjncy[j];
if (k >= firstvtx && k < lastvtx) {
adjwgt[j] = (int)pow(1.0*(amin(vwgt[i],vwgt[k-firstvtx])), .6667);
if (adjwgt[j] == 0)
adjwgt[j] = 1;
}
}
}
*/
mypwgt = idxsum(nvtxs, vwgt);
MPI_Allreduce((void *)&mypwgt, (void *)&max, 1, MPI_INT, MPI_MAX, comm);
MPI_Allreduce((void *)&mypwgt, (void *)&min, 1, MPI_INT, MPI_MIN, comm);
MPI_Allreduce((void *)&mypwgt, (void *)&sum, 1, MPI_INT, MPI_SUM, comm);
if (mype == 0)
printf("Initial Load Imbalance: %5.4f, [%5d %5d %5d] for afactor: %d\n", (1.0*max*npes)/(1.0*sum), min, max, sum, afactor);
free(perm);
}
/*************************************************************************
* This function implements a simple graph adaption strategy.
**************************************************************************/
void AdaptGraph2(GraphType *graph, int afactor, MPI_Comm comm)
{
int i, j, k, nvtxs, firstvtx, lastvtx;
int npes, mype, mypwgt, max, min, sum;
idxtype *vwgt, *xadj, *adjncy, *adjwgt;
MPI_Comm_size(comm, &npes);
MPI_Comm_rank(comm, &mype);
srand(mype*afactor);
srand48(mype*afactor);
nvtxs = graph->nvtxs;
xadj = graph->xadj;
adjncy = graph->adjncy;
if (graph->adjwgt == NULL)
adjwgt = graph->adjwgt = idxsmalloc(graph->nedges, 1, "AdaptGraph: adjwgt");
else
adjwgt = graph->adjwgt;
vwgt = graph->vwgt;
firstvtx = graph->vtxdist[mype];
lastvtx = graph->vtxdist[mype+1];
/* if (RandomInRange(npes+1) < .05*npes) { */
if (RandomInRange(npes+1) < 2) {
printf("[%d] is adapting\n", mype);
for (i=0; i<nvtxs; i++)
vwgt[i] = afactor*vwgt[i];
}
for (i=0; i<nvtxs; i++) {
for (j=xadj[i]; j<xadj[i+1]; j++) {
k = adjncy[j];
if (k >= firstvtx && k < lastvtx) {
adjwgt[j] = (int)pow(1.0*(amin(vwgt[i],vwgt[k-firstvtx])), .6667);
if (adjwgt[j] == 0)
adjwgt[j] = 1;
}
}
}
mypwgt = idxsum(nvtxs, vwgt);
MPI_Allreduce((void *)&mypwgt, (void *)&max, 1, MPI_INT, MPI_MAX, comm);
MPI_Allreduce((void *)&mypwgt, (void *)&min, 1, MPI_INT, MPI_MIN, comm);
MPI_Allreduce((void *)&mypwgt, (void *)&sum, 1, MPI_INT, MPI_SUM, comm);
if (mype == 0)
printf("Initial Load Imbalance: %5.4f, [%5d %5d %5d]\n", (1.0*max*npes)/(1.0*sum), min, max, sum);
}
/*************************************************************************
* This function implements a simple graph adaption strategy.
**************************************************************************/
void Mc_AdaptGraph(GraphType *graph, idxtype *part, int ncon, int nparts, MPI_Comm comm)
{
int h, i;
int nvtxs;
int npes, mype;
idxtype *vwgt, *pwgts;
MPI_Comm_size(comm, &npes);
MPI_Comm_rank(comm, &mype);
nvtxs = graph->nvtxs;
vwgt = graph->vwgt;
pwgts = idxsmalloc(nparts*ncon, 1, "pwgts");
if (mype == 0) {
for (i=0; i<nparts; i++)
for (h=0; h<ncon; h++)
pwgts[i*ncon+h] = RandomInRange(20)+1;
}
MPI_Bcast((void *)pwgts, nparts*ncon, IDX_DATATYPE, 0, comm);
for (i=0; i<nvtxs; i++)
for (h=0; h<ncon; h++)
vwgt[i*ncon+h] = pwgts[part[i]*ncon+h];
free(pwgts);
return;
}
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