/*
* Copyright 1997, Regents of the University of Minnesota
*
* graph.c
*
* This file contains functions that deal with setting up the graphs
* for METIS.
*
* Started 7/25/97
* George
*
* $Id: graph.c,v 1.1 1998/11/27 17:59:15 karypis Exp $
*
*/
#include <metis.h>
/*************************************************************************
* This function sets up the graph from the user input
**************************************************************************/
void SetUpGraph(GraphType *graph, long OpType, long nvtxs, long ncon,
idxtype *xadj, idxtype *adjncy, idxtype *vwgt, idxtype *adjwgt, long wgtflag)
{
long i, j, k, sum, gsize;
float *nvwgt;
idxtype tvwgt[MAXNCON];
if (OpType == OP_KMETIS && ncon == 1 && (wgtflag&2) == 0 && (wgtflag&1) == 0) {
SetUpGraphKway(graph, nvtxs, xadj, adjncy);
return;
}
InitGraph(graph);
graph->nvtxs = nvtxs;
graph->nedges = xadj[nvtxs];
graph->ncon = ncon;
graph->xadj = xadj;
graph->adjncy = adjncy;
if (ncon == 1) { /* We are in the non mC mode */
gsize = 0;
if ((wgtflag&2) == 0)
gsize += nvtxs;
if ((wgtflag&1) == 0)
gsize += graph->nedges;
gsize += 2*nvtxs;
graph->gdata = idxmalloc(gsize, "SetUpGraph: gdata");
/* Create the vertex/edge weight vectors if they are not supplied */
gsize = 0;
if ((wgtflag&2) == 0) {
vwgt = graph->vwgt = idxset(nvtxs, 1, graph->gdata);
gsize += nvtxs;
}
else
graph->vwgt = vwgt;
if ((wgtflag&1) == 0) {
adjwgt = graph->adjwgt = idxset(graph->nedges, 1, graph->gdata+gsize);
gsize += graph->nedges;
}
else
graph->adjwgt = adjwgt;
/* Compute the initial values of the adjwgtsum */
graph->adjwgtsum = graph->gdata + gsize;
gsize += nvtxs;
for (i=0; i<nvtxs; i++) {
sum = 0;
for (j=xadj[i]; j<xadj[i+1]; j++)
sum += adjwgt[j];
graph->adjwgtsum[i] = sum;
}
graph->cmap = graph->gdata + gsize;
gsize += nvtxs;
}
else { /* Set up the graph in MOC mode */
gsize = 0;
if ((wgtflag&1) == 0)
gsize += graph->nedges;
gsize += 2*nvtxs;
graph->gdata = idxmalloc(gsize, "SetUpGraph: gdata");
gsize = 0;
for (i=0; i<ncon; i++)
tvwgt[i] = idxsum_strd(nvtxs, vwgt+i, ncon);
nvwgt = graph->nvwgt = fmalloc(ncon*nvtxs, "SetUpGraph: nvwgt");
for (i=0; i<nvtxs; i++) {
for (j=0; j<ncon; j++)
nvwgt[i*ncon+j] = (1.0*vwgt[i*ncon+j])/(1.0*tvwgt[j]);
}
/* Create the edge weight vectors if they are not supplied */
if ((wgtflag&1) == 0) {
adjwgt = graph->adjwgt = idxset(graph->nedges, 1, graph->gdata+gsize);
gsize += graph->nedges;
}
else
graph->adjwgt = adjwgt;
/* Compute the initial values of the adjwgtsum */
graph->adjwgtsum = graph->gdata + gsize;
gsize += nvtxs;
for (i=0; i<nvtxs; i++) {
sum = 0;
for (j=xadj[i]; j<xadj[i+1]; j++)
sum += adjwgt[j];
graph->adjwgtsum[i] = sum;
}
graph->cmap = graph->gdata + gsize;
gsize += nvtxs;
}
if (OpType != OP_KMETIS && OpType != OP_KVMETIS) {
graph->label = idxmalloc(nvtxs, "SetUpGraph: label");
for (i=0; i<nvtxs; i++)
graph->label[i] = i;
}
}
/*************************************************************************
* This function sets up the graph from the user input
**************************************************************************/
void SetUpGraphKway(GraphType *graph, long nvtxs, idxtype *xadj, idxtype *adjncy)
{
long i;
InitGraph(graph);
graph->nvtxs = nvtxs;
graph->nedges = xadj[nvtxs];
graph->ncon = 1;
graph->xadj = xadj;
graph->vwgt = NULL;
graph->adjncy = adjncy;
graph->adjwgt = NULL;
graph->gdata = idxmalloc(2*nvtxs, "SetUpGraph: gdata");
graph->adjwgtsum = graph->gdata;
graph->cmap = graph->gdata + nvtxs;
/* Compute the initial values of the adjwgtsum */
for (i=0; i<nvtxs; i++)
graph->adjwgtsum[i] = xadj[i+1]-xadj[i];
}
/*************************************************************************
* This function sets up the graph from the user input
**************************************************************************/
void SetUpGraph2(GraphType *graph, long nvtxs, long ncon, idxtype *xadj,
idxtype *adjncy, float *nvwgt, idxtype *adjwgt)
{
long i, j, sum;
InitGraph(graph);
graph->nvtxs = nvtxs;
graph->nedges = xadj[nvtxs];
graph->ncon = ncon;
graph->xadj = xadj;
graph->adjncy = adjncy;
graph->adjwgt = adjwgt;
graph->nvwgt = fmalloc(nvtxs*ncon, "SetUpGraph2: graph->nvwgt");
scopy(nvtxs*ncon, nvwgt, graph->nvwgt);
graph->gdata = idxmalloc(2*nvtxs, "SetUpGraph: gdata");
/* Compute the initial values of the adjwgtsum */
graph->adjwgtsum = graph->gdata;
for (i=0; i<nvtxs; i++) {
sum = 0;
for (j=xadj[i]; j<xadj[i+1]; j++)
sum += adjwgt[j];
graph->adjwgtsum[i] = sum;
}
graph->cmap = graph->gdata+nvtxs;
graph->label = idxmalloc(nvtxs, "SetUpGraph: label");
for (i=0; i<nvtxs; i++)
graph->label[i] = i;
}
/*************************************************************************
* This function sets up the graph from the user input
**************************************************************************/
void VolSetUpGraph(GraphType *graph, long OpType, long nvtxs, long ncon, idxtype *xadj,
idxtype *adjncy, idxtype *vwgt, idxtype *vsize, long wgtflag)
{
long i, j, k, sum, gsize;
idxtype *adjwgt;
float *nvwgt;
idxtype tvwgt[MAXNCON];
InitGraph(graph);
graph->nvtxs = nvtxs;
graph->nedges = xadj[nvtxs];
graph->ncon = ncon;
graph->xadj = xadj;
graph->adjncy = adjncy;
if (ncon == 1) { /* We are in the non mC mode */
gsize = graph->nedges; /* This is for the edge weights */
if ((wgtflag&2) == 0)
gsize += nvtxs; /* vwgts */
if ((wgtflag&1) == 0)
gsize += nvtxs; /* vsize */
gsize += 2*nvtxs;
graph->gdata = idxmalloc(gsize, "SetUpGraph: gdata");
/* Create the vertex/edge weight vectors if they are not supplied */
gsize = 0;
if ((wgtflag&2) == 0) {
vwgt = graph->vwgt = idxset(nvtxs, 1, graph->gdata);
gsize += nvtxs;
}
else
graph->vwgt = vwgt;
if ((wgtflag&1) == 0) {
vsize = graph->vsize = idxset(nvtxs, 1, graph->gdata);
gsize += nvtxs;
}
else
graph->vsize = vsize;
/* Allocate memory for edge weights and initialize them to the sum of the vsize */
adjwgt = graph->adjwgt = graph->gdata+gsize;
gsize += graph->nedges;
for (i=0; i<nvtxs; i++) {
for (j=xadj[i]; j<xadj[i+1]; j++)
adjwgt[j] = 1+vsize[i]+vsize[adjncy[j]];
}
/* Compute the initial values of the adjwgtsum */
graph->adjwgtsum = graph->gdata + gsize;
gsize += nvtxs;
for (i=0; i<nvtxs; i++) {
sum = 0;
for (j=xadj[i]; j<xadj[i+1]; j++)
sum += adjwgt[j];
graph->adjwgtsum[i] = sum;
}
graph->cmap = graph->gdata + gsize;
gsize += nvtxs;
}
else { /* Set up the graph in MOC mode */
gsize = graph->nedges;
if ((wgtflag&1) == 0)
gsize += nvtxs;
gsize += 2*nvtxs;
graph->gdata = idxmalloc(gsize, "SetUpGraph: gdata");
gsize = 0;
/* Create the normalized vertex weights along each constrain */
if ((wgtflag&2) == 0)
vwgt = idxsmalloc(nvtxs, 1, "SetUpGraph: vwgt");
for (i=0; i<ncon; i++)
tvwgt[i] = idxsum_strd(nvtxs, vwgt+i, ncon);
nvwgt = graph->nvwgt = fmalloc(ncon*nvtxs, "SetUpGraph: nvwgt");
for (i=0; i<nvtxs; i++) {
for (j=0; j<ncon; j++)
nvwgt[i*ncon+j] = (1.0*vwgt[i*ncon+j])/(1.0*tvwgt[j]);
}
if ((wgtflag&2) == 0)
free(vwgt);
/* Create the vsize vector if it is not supplied */
if ((wgtflag&1) == 0) {
vsize = graph->vsize = idxset(nvtxs, 1, graph->gdata);
gsize += nvtxs;
}
else
graph->vsize = vsize;
/* Allocate memory for edge weights and initialize them to the sum of the vsize */
adjwgt = graph->adjwgt = graph->gdata+gsize;
gsize += graph->nedges;
for (i=0; i<nvtxs; i++) {
for (j=xadj[i]; j<xadj[i+1]; j++)
adjwgt[j] = 1+vsize[i]+vsize[adjncy[j]];
}
/* Compute the initial values of the adjwgtsum */
graph->adjwgtsum = graph->gdata + gsize;
gsize += nvtxs;
for (i=0; i<nvtxs; i++) {
sum = 0;
for (j=xadj[i]; j<xadj[i+1]; j++)
sum += adjwgt[j];
graph->adjwgtsum[i] = sum;
}
graph->cmap = graph->gdata + gsize;
gsize += nvtxs;
}
if (OpType != OP_KVMETIS) {
graph->label = idxmalloc(nvtxs, "SetUpGraph: label");
for (i=0; i<nvtxs; i++)
graph->label[i] = i;
}
}
/*************************************************************************
* This function randomly permutes the adjacency lists of a graph
**************************************************************************/
void RandomizeGraph(GraphType *graph)
{
long i, j, k, l, tmp, nvtxs;
idxtype *xadj, *adjncy, *adjwgt;
nvtxs = graph->nvtxs;
xadj = graph->xadj;
adjncy = graph->adjncy;
adjwgt = graph->adjwgt;
for (i=0; i<nvtxs; i++) {
l = xadj[i+1]-xadj[i];
for (j=xadj[i]; j<xadj[i+1]; j++) {
k = xadj[i] + RandomInRange(l);
SWAP(adjncy[j], adjncy[k], tmp);
SWAP(adjwgt[j], adjwgt[k], tmp);
}
}
}
/*************************************************************************
* This function checks whether or not partition pid is contigous
**************************************************************************/
long IsConnectedSubdomain(CtrlType *ctrl, GraphType *graph, long pid, long report)
{
long i, j, k, nvtxs, first, last, nleft, ncmps, wgt;
idxtype *xadj, *adjncy, *where, *touched, *queue;
idxtype *cptr;
nvtxs = graph->nvtxs;
xadj = graph->xadj;
adjncy = graph->adjncy;
where = graph->where;
touched = idxsmalloc(nvtxs, 0, "IsConnected: touched");
queue = idxmalloc(nvtxs, "IsConnected: queue");
cptr = idxmalloc(nvtxs, "IsConnected: cptr");
nleft = 0;
for (i=0; i<nvtxs; i++) {
if (where[i] == pid)
nleft++;
}
for (i=0; i<nvtxs; i++) {
if (where[i] == pid)
break;
}
touched[i] = 1;
queue[0] = i;
first = 0; last = 1;
cptr[0] = 0; /* This actually points to queue */
ncmps = 0;
while (first != nleft) {
if (first == last) { /* Find another starting vertex */
cptr[++ncmps] = first;
for (i=0; i<nvtxs; i++) {
if (where[i] == pid && !touched[i])
break;
}
queue[last++] = i;
touched[i] = 1;
}
i = queue[first++];
for (j=xadj[i]; j<xadj[i+1]; j++) {
k = adjncy[j];
if (where[k] == pid && !touched[k]) {
queue[last++] = k;
touched[k] = 1;
}
}
}
cptr[++ncmps] = first;
if (ncmps > 1 && report) {
printf("The graph has %ld connected components in partition %ld:\t", ncmps, pid);
for (i=0; i<ncmps; i++) {
wgt = 0;
for (j=cptr[i]; j<cptr[i+1]; j++)
wgt += graph->vwgt[queue[j]];
printf("[%5ld %5ld] ", cptr[i+1]-cptr[i], wgt);
/*
if (cptr[i+1]-cptr[i] == 1)
printf("[%ld %ld] ", queue[cptr[i]], xadj[queue[cptr[i]]+1]-xadj[queue[cptr[i]]]);
*/
}
printf("\n");
}
GKfree(&touched, &queue, &cptr, LTERM);
return (ncmps == 1 ? 1 : 0);
}
/*************************************************************************
* This function checks whether a graph is contigous or not
**************************************************************************/
long IsConnected(CtrlType *ctrl, GraphType *graph, long report)
{
long i, j, k, nvtxs, first, last;
idxtype *xadj, *adjncy, *touched, *queue;
nvtxs = graph->nvtxs;
xadj = graph->xadj;
adjncy = graph->adjncy;
touched = idxsmalloc(nvtxs, 0, "IsConnected: touched");
queue = idxmalloc(nvtxs, "IsConnected: queue");
touched[0] = 1;
queue[0] = 0;
first = 0; last = 1;
while (first < last) {
i = queue[first++];
for (j=xadj[i]; j<xadj[i+1]; j++) {
k = adjncy[j];
if (!touched[k]) {
queue[last++] = k;
touched[k] = 1;
}
}
}
if (first != nvtxs && report)
printf("The graph is not connected. It has %ld disconnected vertices!\n", nvtxs-first);
return (first == nvtxs ? 1 : 0);
}
/*************************************************************************
* This function checks whether or not partition pid is contigous
**************************************************************************/
long IsConnected2(GraphType *graph, long report)
{
long i, j, k, nvtxs, first, last, nleft, ncmps, wgt;
idxtype *xadj, *adjncy, *where, *touched, *queue;
idxtype *cptr;
nvtxs = graph->nvtxs;
xadj = graph->xadj;
adjncy = graph->adjncy;
where = graph->where;
touched = idxsmalloc(nvtxs, 0, "IsConnected: touched");
queue = idxmalloc(nvtxs, "IsConnected: queue");
cptr = idxmalloc(nvtxs, "IsConnected: cptr");
nleft = nvtxs;
touched[0] = 1;
queue[0] = 0;
first = 0; last = 1;
cptr[0] = 0; /* This actually points to queue */
ncmps = 0;
while (first != nleft) {
if (first == last) { /* Find another starting vertex */
cptr[++ncmps] = first;
for (i=0; i<nvtxs; i++) {
if (!touched[i])
break;
}
queue[last++] = i;
touched[i] = 1;
}
i = queue[first++];
for (j=xadj[i]; j<xadj[i+1]; j++) {
k = adjncy[j];
if (!touched[k]) {
queue[last++] = k;
touched[k] = 1;
}
}
}
cptr[++ncmps] = first;
if (ncmps > 1 && report) {
printf("%ld connected components:\t", ncmps);
for (i=0; i<ncmps; i++) {
if (cptr[i+1]-cptr[i] > 200)
printf("[%5ld] ", cptr[i+1]-cptr[i]);
}
printf("\n");
}
GKfree(&touched, &queue, &cptr, LTERM);
return (ncmps == 1 ? 1 : 0);
}
/*************************************************************************
* This function returns the number of connected components in cptr,cind
* The separator of the graph is used to split it and then find its components.
**************************************************************************/
long FindComponents(CtrlType *ctrl, GraphType *graph, idxtype *cptr, idxtype *cind)
{
long i, j, k, nvtxs, first, last, nleft, ncmps, wgt;
idxtype *xadj, *adjncy, *where, *touched, *queue;
nvtxs = graph->nvtxs;
xadj = graph->xadj;
adjncy = graph->adjncy;
where = graph->where;
touched = idxsmalloc(nvtxs, 0, "IsConnected: queue");
for (i=0; i<graph->nbnd; i++)
touched[graph->bndind[i]] = 1;
queue = cind;
nleft = 0;
for (i=0; i<nvtxs; i++) {
if (where[i] != 2)
nleft++;
}
for (i=0; i<nvtxs; i++) {
if (where[i] != 2)
break;
}
touched[i] = 1;
queue[0] = i;
first = 0; last = 1;
cptr[0] = 0; /* This actually points to queue */
ncmps = 0;
while (first != nleft) {
if (first == last) { /* Find another starting vertex */
cptr[++ncmps] = first;
for (i=0; i<nvtxs; i++) {
if (!touched[i])
break;
}
queue[last++] = i;
touched[i] = 1;
}
i = queue[first++];
for (j=xadj[i]; j<xadj[i+1]; j++) {
k = adjncy[j];
if (!touched[k]) {
queue[last++] = k;
touched[k] = 1;
}
}
}
cptr[++ncmps] = first;
free(touched);
return ncmps;
}
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