/*************************************************************************
* This function performs an edge-based FM refinement
**************************************************************************/
void Mc_Serial_Balance2Way(GraphType *graph, float *tpwgts, float lbfactor)
{
int i, ii, j, k, kwgt, nvtxs, ncon, nbnd, nswaps, from, to, limit, tmp, cnum;
idxtype *xadj, *adjncy, *adjwgt, *where, *id, *ed, *bndptr, *bndind;
idxtype *moved, *swaps, *qnum;
float *nvwgt, *npwgts, mindiff[MAXNCON], origbal, minbal, newbal;
FPQueueType parts[MAXNCON][2];
int higain, oldgain, mincut, newcut, mincutorder;
int qsizes[MAXNCON][2];
KeyValueType *cand;
nvtxs = graph->nvtxs;
ncon = graph->ncon;
xadj = graph->xadj;
nvwgt = graph->nvwgt;
adjncy = graph->adjncy;
adjwgt = graph->adjwgt;
where = graph->where;
id = graph->sendind;
ed = graph->recvind;
npwgts = graph->gnpwgts;
bndptr = graph->sendptr;
bndind = graph->recvptr;
moved = idxmalloc(nvtxs, "moved");
swaps = idxmalloc(nvtxs, "swaps");
qnum = idxmalloc(nvtxs, "qnum");
cand = (KeyValueType *)GKmalloc(nvtxs*sizeof(KeyValueType), "cand");
limit = amin(amax(0.01*nvtxs, 15), 100);
/* Initialize the queues */
for (i=0; i<ncon; i++) {
FPQueueInit(&parts[i][0], nvtxs);
FPQueueInit(&parts[i][1], nvtxs);
qsizes[i][0] = qsizes[i][1] = 0;
}
for (i=0; i<nvtxs; i++) {
qnum[i] = samax(ncon, nvwgt+i*ncon);
qsizes[qnum[i]][where[i]]++;
}
for (from=0; from<2; from++) {
for (j=0; j<ncon; j++) {
if (qsizes[j][from] == 0) {
for (i=0; i<nvtxs; i++) {
if (where[i] != from)
continue;
k = samax2(ncon, nvwgt+i*ncon);
if (k == j &&
qsizes[qnum[i]][from] > qsizes[j][from] &&
nvwgt[i*ncon+qnum[i]] < 1.3*nvwgt[i*ncon+j]) {
qsizes[qnum[i]][from]--;
qsizes[j][from]++;
qnum[i] = j;
}
}
}
}
}
for (i=0; i<ncon; i++)
mindiff[i] = fabs(tpwgts[i]-npwgts[i]);
minbal = origbal = Serial_Compute2WayHLoadImbalance(ncon, npwgts, tpwgts);
newcut = mincut = graph->mincut;
mincutorder = -1;
idxset(nvtxs, -1, moved);
/* Insert all nodes in the priority queues */
nbnd = graph->gnvtxs;
for (i=0; i<nvtxs; i++) {
cand[i].key = id[i]-ed[i];
cand[i].val = i;
}
ikeysort(nvtxs, cand);
for (ii=0; ii<nvtxs; ii++) {
i = cand[ii].val;
FPQueueInsert(&parts[qnum[i]][where[i]], i, (float)(ed[i]-id[i]));
}
for (nswaps=0; nswaps<nvtxs; nswaps++) {
if (minbal < lbfactor)
break;
Serial_SelectQueue(ncon, npwgts, tpwgts, &from, &cnum, parts);
to = (from+1)%2;
if (from == -1 || (higain = FPQueueGetMax(&parts[cnum][from])) == -1)
break;
saxpy2(ncon, 1.0, nvwgt+higain*ncon, 1, npwgts+to*ncon, 1);
saxpy2(ncon, -1.0, nvwgt+higain*ncon, 1, npwgts+from*ncon, 1);
newcut -= (ed[higain]-id[higain]);
newbal = Serial_Compute2WayHLoadImbalance(ncon, npwgts, tpwgts);
if (newbal < minbal || (newbal == minbal &&
(newcut < mincut || (newcut == mincut &&
Serial_BetterBalance(ncon, npwgts, tpwgts, mindiff))))) {
mincut = newcut;
minbal = newbal;
mincutorder = nswaps;
for (i=0; i<ncon; i++)
mindiff[i] = fabs(tpwgts[i]-npwgts[i]);
}
else if (nswaps-mincutorder > limit) { /* We hit the limit, undo last move */
newcut += (ed[higain]-id[higain]);
saxpy2(ncon, 1.0, nvwgt+higain*ncon, 1, npwgts+from*ncon, 1);
saxpy2(ncon, -1.0, nvwgt+higain*ncon, 1, npwgts+to*ncon, 1);
break;
}
where[higain] = to;
moved[higain] = nswaps;
swaps[nswaps] = higain;
/**************************************************************
* Update the id[i]/ed[i] values of the affected nodes
***************************************************************/
SWAP(id[higain], ed[higain], tmp);
if (ed[higain] == 0 && bndptr[higain] != -1 && xadj[higain] < xadj[higain+1])
BNDDelete(nbnd, bndind, bndptr, higain);
if (ed[higain] > 0 && bndptr[higain] == -1)
BNDInsert(nbnd, bndind, bndptr, higain);
for (j=xadj[higain]; j<xadj[higain+1]; j++) {
k = adjncy[j];
oldgain = ed[k]-id[k];
kwgt = (to == where[k] ? adjwgt[j] : -adjwgt[j]);
INC_DEC(id[k], ed[k], kwgt);
/* Update the queue position */
if (moved[k] == -1)
FPQueueUpdate(&parts[qnum[k]][where[k]], k, (float)(oldgain), (float)(ed[k]-id[k]));
/* Update its boundary information */
if (ed[k] == 0 && bndptr[k] != -1)
BNDDelete(nbnd, bndind, bndptr, k);
else if (ed[k] > 0 && bndptr[k] == -1)
BNDInsert(nbnd, bndind, bndptr, k);
}
}
/****************************************************************
* Roll back computations
*****************************************************************/
for (nswaps--; nswaps>mincutorder; nswaps--) {
higain = swaps[nswaps];
to = where[higain] = (where[higain]+1)%2;
SWAP(id[higain], ed[higain], tmp);
if (ed[higain] == 0 && bndptr[higain] != -1 && xadj[higain] < xadj[higain+1])
BNDDelete(nbnd, bndind, bndptr, higain);
else if (ed[higain] > 0 && bndptr[higain] == -1)
BNDInsert(nbnd, bndind, bndptr, higain);
saxpy2(ncon, 1.0, nvwgt+higain*ncon, 1, npwgts+to*ncon, 1);
saxpy2(ncon, -1.0, nvwgt+higain*ncon, 1, npwgts+((to+1)%2)*ncon, 1);
for (j=xadj[higain]; j<xadj[higain+1]; j++) {
k = adjncy[j];
kwgt = (to == where[k] ? adjwgt[j] : -adjwgt[j]);
INC_DEC(id[k], ed[k], kwgt);
if (bndptr[k] != -1 && ed[k] == 0)
BNDDelete(nbnd, bndind, bndptr, k);
if (bndptr[k] == -1 && ed[k] > 0)
BNDInsert(nbnd, bndind, bndptr, k);
}
}
graph->mincut = mincut;
graph->gnvtxs = nbnd;
for (i=0; i<ncon; i++) {
FPQueueFree(&parts[i][0]);
FPQueueFree(&parts[i][1]);
}
GKfree((void **)&cand, (void **)&qnum, (void **)&moved, (void **)&swaps, LTERM);
return;
}
/*************************************************************************
* This function balances two partitions by moving the highest gain
* (including negative gain) vertices to the other domain.
* It is used only when tha unbalance is due to non contigous
* subdomains. That is, the are no boundary vertices.
* It moves vertices from the domain that is overweight to the one that
* is underweight.
**************************************************************************/
void Mc_Serial_Init2WayBalance(GraphType *graph, float *tpwgts)
{
int i, ii, j, k;
int kwgt, nvtxs, nbnd, ncon, nswaps, from, to, cnum, tmp;
idxtype *xadj, *adjncy, *adjwgt, *where, *id, *ed, *bndptr, *bndind;
idxtype *qnum;
float *nvwgt, *npwgts;
FPQueueType parts[MAXNCON][2];
int higain, oldgain, mincut;
KeyValueType *cand;
nvtxs = graph->nvtxs;
ncon = graph->ncon;
xadj = graph->xadj;
adjncy = graph->adjncy;
nvwgt = graph->nvwgt;
adjwgt = graph->adjwgt;
where = graph->where;
id = graph->sendind;
ed = graph->recvind;
npwgts = graph->gnpwgts;
bndptr = graph->sendptr;
bndind = graph->recvptr;
qnum = idxmalloc(nvtxs, "qnum");
cand = (KeyValueType *)GKmalloc(nvtxs*sizeof(KeyValueType), "cand");
/* This is called for initial partitioning so we know from where to pick nodes */
from = 1;
to = (from+1)%2;
for (i=0; i<ncon; i++) {
FPQueueInit(&parts[i][0], nvtxs);
FPQueueInit(&parts[i][1], nvtxs);
}
/* Compute the queues in which each vertex will be assigned to */
for (i=0; i<nvtxs; i++)
qnum[i] = samax(ncon, nvwgt+i*ncon);
for (i=0; i<nvtxs; i++) {
cand[i].key = id[i]-ed[i];
cand[i].val = i;
}
ikeysort(nvtxs, cand);
/* Insert the nodes of the proper partition in the appropriate priority queue */
for (ii=0; ii<nvtxs; ii++) {
i = cand[ii].val;
if (where[i] == from) {
if (ed[i] > 0)
FPQueueInsert(&parts[qnum[i]][0], i, (float)(ed[i]-id[i]));
else
FPQueueInsert(&parts[qnum[i]][1], i, (float)(ed[i]-id[i]));
}
}
mincut = graph->mincut;
nbnd = graph->gnvtxs;
for (nswaps=0; nswaps<nvtxs; nswaps++) {
if (Serial_AreAnyVwgtsBelow(ncon, 1.0, npwgts+from*ncon, 0.0, nvwgt, tpwgts+from*ncon))
break;
if ((cnum = Serial_SelectQueueOneWay(ncon, npwgts, tpwgts, from, parts)) == -1)
break;
if ((higain = FPQueueGetMax(&parts[cnum][0])) == -1)
higain = FPQueueGetMax(&parts[cnum][1]);
mincut -= (ed[higain]-id[higain]);
saxpy2(ncon, 1.0, nvwgt+higain*ncon, 1, npwgts+to*ncon, 1);
saxpy2(ncon, -1.0, nvwgt+higain*ncon, 1, npwgts+from*ncon, 1);
where[higain] = to;
/**************************************************************
* Update the id[i]/ed[i] values of the affected nodes
***************************************************************/
SWAP(id[higain], ed[higain], tmp);
if (ed[higain] == 0 && bndptr[higain] != -1 && xadj[higain] < xadj[higain+1])
BNDDelete(nbnd, bndind, bndptr, higain);
if (ed[higain] > 0 && bndptr[higain] == -1)
BNDInsert(nbnd, bndind, bndptr, higain);
for (j=xadj[higain]; j<xadj[higain+1]; j++) {
k = adjncy[j];
oldgain = ed[k]-id[k];
kwgt = (to == where[k] ? adjwgt[j] : -adjwgt[j]);
INC_DEC(id[k], ed[k], kwgt);
/* Update the queue position */
if (where[k] == from) {
if (ed[k] > 0 && bndptr[k] == -1) { /* It moves in boundary */
FPQueueDelete(&parts[qnum[k]][1], k);
FPQueueInsert(&parts[qnum[k]][0], k, (float)(ed[k]-id[k]));
}
else { /* It must be in the boundary already */
FPQueueUpdate(&parts[qnum[k]][0], k, (float)(oldgain), (float)(ed[k]-id[k]));
}
}
/* Update its boundary information */
if (ed[k] == 0 && bndptr[k] != -1)
BNDDelete(nbnd, bndind, bndptr, k);
else if (ed[k] > 0 && bndptr[k] == -1)
BNDInsert(nbnd, bndind, bndptr, k);
}
}
graph->mincut = mincut;
graph->gnvtxs = nbnd;
for (i=0; i<ncon; i++) {
FPQueueFree(&parts[i][0]);
FPQueueFree(&parts[i][1]);
}
GKfree((void **)&cand, (void **)&qnum, LTERM);
}
/*************************************************************************
* This function performs an edge-based FM refinement
**************************************************************************/
void Mc_Serial_FM_2WayRefine(GraphType *graph, float *tpwgts, int npasses)
{
int i, ii, j, k;
int kwgt, nvtxs, ncon, nbnd, nswaps, from, to, pass, limit, tmp, cnum;
idxtype *xadj, *adjncy, *adjwgt, *where, *id, *ed, *bndptr, *bndind;
idxtype *moved, *swaps, *qnum;
float *nvwgt, *npwgts, mindiff[MAXNCON], origbal, minbal, newbal;
FPQueueType parts[MAXNCON][2];
int higain, oldgain, mincut, initcut, newcut, mincutorder;
float rtpwgts[MAXNCON*2];
KeyValueType *cand;
int mype;
MPI_Comm_rank(MPI_COMM_WORLD, &mype);
nvtxs = graph->nvtxs;
ncon = graph->ncon;
xadj = graph->xadj;
nvwgt = graph->nvwgt;
adjncy = graph->adjncy;
adjwgt = graph->adjwgt;
where = graph->where;
id = graph->sendind;
ed = graph->recvind;
npwgts = graph->gnpwgts;
bndptr = graph->sendptr;
bndind = graph->recvptr;
moved = idxmalloc(nvtxs, "moved");
swaps = idxmalloc(nvtxs, "swaps");
qnum = idxmalloc(nvtxs, "qnum");
cand = (KeyValueType *)GKmalloc(nvtxs*sizeof(KeyValueType), "cand");
limit = amin(amax(0.01*nvtxs, 25), 150);
/* Initialize the queues */
for (i=0; i<ncon; i++) {
FPQueueInit(&parts[i][0], nvtxs);
FPQueueInit(&parts[i][1], nvtxs);
}
for (i=0; i<nvtxs; i++)
qnum[i] = samax(ncon, nvwgt+i*ncon);
origbal = Serial_Compute2WayHLoadImbalance(ncon, npwgts, tpwgts);
for (i=0; i<ncon; i++) {
rtpwgts[i] = origbal*tpwgts[i];
rtpwgts[ncon+i] = origbal*tpwgts[ncon+i];
}
idxset(nvtxs, -1, moved);
for (pass=0; pass<npasses; pass++) { /* Do a number of passes */
for (i=0; i<ncon; i++) {
FPQueueReset(&parts[i][0]);
FPQueueReset(&parts[i][1]);
}
mincutorder = -1;
newcut = mincut = initcut = graph->mincut;
for (i=0; i<ncon; i++)
mindiff[i] = fabs(tpwgts[i]-npwgts[i]);
minbal = Serial_Compute2WayHLoadImbalance(ncon, npwgts, tpwgts);
/* Insert boundary nodes in the priority queues */
nbnd = graph->gnvtxs;
for (i=0; i<nbnd; i++) {
cand[i].key = id[i]-ed[i];
cand[i].val = i;
}
ikeysort(nbnd, cand);
for (ii=0; ii<nbnd; ii++) {
i = bndind[cand[ii].val];
FPQueueInsert(&parts[qnum[i]][where[i]], i, (float)(ed[i]-id[i]));
}
for (nswaps=0; nswaps<nvtxs; nswaps++) {
Serial_SelectQueue(ncon, npwgts, rtpwgts, &from, &cnum, parts);
to = (from+1)%2;
if (from == -1 || (higain = FPQueueGetMax(&parts[cnum][from])) == -1)
break;
saxpy2(ncon, 1.0, nvwgt+higain*ncon, 1, npwgts+to*ncon, 1);
saxpy2(ncon, -1.0, nvwgt+higain*ncon, 1, npwgts+from*ncon, 1);
newcut -= (ed[higain]-id[higain]);
newbal = Serial_Compute2WayHLoadImbalance(ncon, npwgts, tpwgts);
if ((newcut < mincut && newbal-origbal <= .00001) ||
(newcut == mincut && (newbal < minbal ||
(newbal == minbal && Serial_BetterBalance(ncon, npwgts, tpwgts, mindiff))))) {
mincut = newcut;
minbal = newbal;
mincutorder = nswaps;
for (i=0; i<ncon; i++)
mindiff[i] = fabs(tpwgts[i]-npwgts[i]);
}
else if (nswaps-mincutorder > limit) { /* We hit the limit, undo last move */
newcut += (ed[higain]-id[higain]);
saxpy2(ncon, 1.0, nvwgt+higain*ncon, 1, npwgts+from*ncon, 1);
saxpy2(ncon, -1.0, nvwgt+higain*ncon, 1, npwgts+to*ncon, 1);
break;
}
where[higain] = to;
moved[higain] = nswaps;
swaps[nswaps] = higain;
/**************************************************************
* Update the id[i]/ed[i] values of the affected nodes
***************************************************************/
SWAP(id[higain], ed[higain], tmp);
if (ed[higain] == 0 && xadj[higain] < xadj[higain+1])
BNDDelete(nbnd, bndind, bndptr, higain);
for (j=xadj[higain]; j<xadj[higain+1]; j++) {
k = adjncy[j];
oldgain = ed[k]-id[k];
kwgt = (to == where[k] ? adjwgt[j] : -adjwgt[j]);
INC_DEC(id[k], ed[k], kwgt);
/* Update its boundary information and queue position */
if (bndptr[k] != -1) { /* If k was a boundary vertex */
if (ed[k] == 0) { /* Not a boundary vertex any more */
BNDDelete(nbnd, bndind, bndptr, k);
if (moved[k] == -1) /* Remove it if in the queues */
FPQueueDelete(&parts[qnum[k]][where[k]], k);
}
else { /* If it has not been moved, update its position in the queue */
if (moved[k] == -1)
FPQueueUpdate(&parts[qnum[k]][where[k]], k, (float)oldgain, (float)(ed[k]-id[k]));
}
}
else {
if (ed[k] > 0) { /* It will now become a boundary vertex */
BNDInsert(nbnd, bndind, bndptr, k);
if (moved[k] == -1)
FPQueueInsert(&parts[qnum[k]][where[k]], k, (float)(ed[k]-id[k]));
}
}
}
}
/****************************************************************
* Roll back computations
*****************************************************************/
for (i=0; i<nswaps; i++)
moved[swaps[i]] = -1; /* reset moved array */
for (nswaps--; nswaps>mincutorder; nswaps--) {
higain = swaps[nswaps];
to = where[higain] = (where[higain]+1)%2;
SWAP(id[higain], ed[higain], tmp);
if (ed[higain] == 0 && bndptr[higain] != -1 && xadj[higain] < xadj[higain+1])
BNDDelete(nbnd, bndind, bndptr, higain);
else if (ed[higain] > 0 && bndptr[higain] == -1)
BNDInsert(nbnd, bndind, bndptr, higain);
saxpy2(ncon, 1.0, nvwgt+higain*ncon, 1, npwgts+to*ncon, 1);
saxpy2(ncon, -1.0, nvwgt+higain*ncon, 1, npwgts+((to+1)%2)*ncon, 1);
for (j=xadj[higain]; j<xadj[higain+1]; j++) {
k = adjncy[j];
kwgt = (to == where[k] ? adjwgt[j] : -adjwgt[j]);
INC_DEC(id[k], ed[k], kwgt);
if (bndptr[k] != -1 && ed[k] == 0)
BNDDelete(nbnd, bndind, bndptr, k);
if (bndptr[k] == -1 && ed[k] > 0)
BNDInsert(nbnd, bndind, bndptr, k);
}
}
graph->mincut = mincut;
graph->gnvtxs = nbnd;
if (mincutorder == -1 || mincut == initcut)
break;
}
for (i=0; i<ncon; i++) {
FPQueueFree(&parts[i][0]);
FPQueueFree(&parts[i][1]);
}
GKfree((void **)&cand, (void **)&qnum, (void **)&moved, (void **)&swaps, LTERM);
return;
}
/*************************************************************************
* This function performs an edge-based FM refinement
**************************************************************************/
int BalanceMyLink(CtrlType *ctrl, GraphType *graph, idxtype *home, int me,
int you, float *flows, float maxdiff, float *diff_cost, float *diff_lbavg,
float avgvwgt)
{
int h, i, ii, j, k;
int nvtxs, ncon;
int nqueues, minval, maxval, higain, vtx, edge, totalv;
int from, to, qnum, index, nchanges, cut, tmp;
int pass, nswaps, nmoves, multiplier;
idxtype *xadj, *vsize, *adjncy, *adjwgt, *where, *ed, *id;
idxtype *hval, *nvpq, *inq, *map, *rmap, *ptr, *myqueue, *changes;
float *nvwgt, lbvec[MAXNCON], pwgts[MAXNCON*2], tpwgts[MAXNCON*2], my_wgt[MAXNCON];
float newgain, oldgain = 0.0;
float lbavg, bestflow, mycost;
float ipc_factor, redist_factor, ftmp;
FPQueueType *queues;
int mype;
MPI_Comm_rank(MPI_COMM_WORLD, &mype);
nvtxs = graph->nvtxs;
ncon = graph->ncon;
xadj = graph->xadj;
nvwgt = graph->nvwgt;
vsize = graph->vsize;
adjncy = graph->adjncy;
adjwgt = graph->adjwgt;
where = graph->where;
ipc_factor = ctrl->ipc_factor;
redist_factor = ctrl->redist_factor;
hval = idxmalloc(nvtxs*7, "hval");
id = hval + nvtxs;
ed = hval + nvtxs*2;
map = hval + nvtxs*3;
rmap = hval + nvtxs*4;
myqueue = hval + nvtxs*5;
changes = hval + nvtxs*6;
sset(ncon*2, 0.0, pwgts);
for (h=0; h<ncon; h++) {
tpwgts[h] = -1.0 * flows[h];
tpwgts[ncon+h] = flows[h];
}
for (i=0; i<nvtxs; i++) {
if (where[i] == me) {
for (h=0; h<ncon; h++) {
tpwgts[h] += nvwgt[i*ncon+h];
pwgts[h] += nvwgt[i*ncon+h];
}
}
else {
ASSERTS(where[i] == you);
for (h=0; h<ncon; h++) {
tpwgts[ncon+h] += nvwgt[i*ncon+h];
pwgts[ncon+h] += nvwgt[i*ncon+h];
}
}
}
/* we don't want any tpwgts to be less than zero */
for (h=0; h<ncon; h++) {
if (tpwgts[h] < 0.0) {
tpwgts[ncon+h] += tpwgts[h];
tpwgts[h] = 0.0;
}
if (tpwgts[ncon+h] < 0.0) {
tpwgts[h] += tpwgts[ncon+h];
tpwgts[ncon+h] = 0.0;
}
}
/*******************************/
/* insert vertices into queues */
/*******************************/
minval = maxval = 0;
multiplier = 1;
for (i=0; i<ncon; i++) {
multiplier *= (i+1);
maxval += i*multiplier;
minval += (ncon-1-i)*multiplier;
}
nqueues = maxval-minval+1;
nvpq = idxsmalloc(nqueues, 0, "nvpq");
ptr = idxmalloc(nqueues+1, "ptr");
inq = idxmalloc(nqueues*2, "inq");
queues = (FPQueueType *)(GKmalloc(sizeof(FPQueueType)*nqueues*2, "queues"));
for (i=0; i<nvtxs; i++)
hval[i] = Moc_HashVwgts(ncon, nvwgt+i*ncon) - minval;
for (i=0; i<nvtxs; i++)
nvpq[hval[i]]++;
ptr[0] = 0;
for (i=0; i<nqueues; i++)
ptr[i+1] = ptr[i] + nvpq[i];
for (i=0; i<nvtxs; i++) {
map[i] = ptr[hval[i]];
rmap[ptr[hval[i]]++] = i;
}
for (i=nqueues-1; i>0; i--)
ptr[i] = ptr[i-1];
ptr[0] = 0;
/* initialize queues */
for (i=0; i<nqueues; i++)
if (nvpq[i] > 0) {
FPQueueInit(queues+i, nvpq[i]);
FPQueueInit(queues+i+nqueues, nvpq[i]);
}
/* compute internal/external degrees */
idxset(nvtxs, 0, id);
idxset(nvtxs, 0, ed);
for (j=0; j<nvtxs; j++)
for (k=xadj[j]; k<xadj[j+1]; k++)
if (where[adjncy[k]] == where[j])
id[j] += adjwgt[k];
else
ed[j] += adjwgt[k];
nswaps = 0;
for (pass=0; pass<N_MOC_BAL_PASSES; pass++) {
idxset(nvtxs, -1, myqueue);
idxset(nqueues*2, 0, inq);
/* insert vertices into correct queues */
for (j=0; j<nvtxs; j++) {
index = (where[j] == me) ? 0 : nqueues;
newgain = ipc_factor*(float)(ed[j]-id[j]);
if (home[j] == me || home[j] == you) {
if (where[j] == home[j])
newgain -= redist_factor*(float)vsize[j];
else
newgain += redist_factor*(float)vsize[j];
}
FPQueueInsert(queues+hval[j]+index, map[j]-ptr[hval[j]], newgain);
myqueue[j] = (where[j] == me) ? 0 : 1;
inq[hval[j]+index]++;
}
/* bestflow = sfavg(ncon, flows); */
for (j=0, h=0; h<ncon; h++)
if (fabs(flows[h]) > fabs(flows[j])) j = h;
bestflow = fabs(flows[j]);
nchanges = nmoves = 0;
for (ii=0; ii<nvtxs/2; ii++) {
from = -1;
Moc_DynamicSelectQueue(nqueues, ncon, me, you, inq, flows, &from,
&qnum, minval, avgvwgt, maxdiff);
/* can't find a vertex in one subdomain, try the other */
if (from != -1 && qnum == -1) {
from = (from == me) ? you : me;
if (from == me) {
for (j=0; j<ncon; j++)
if (flows[j] > avgvwgt)
break;
}
else {
for (j=0; j<ncon; j++)
if (flows[j] < -1.0*avgvwgt)
break;
}
if (j != ncon)
Moc_DynamicSelectQueue(nqueues, ncon, me, you, inq, flows, &from,
&qnum, minval, avgvwgt, maxdiff);
}
if (qnum == -1)
break;
to = (from == me) ? you : me;
index = (from == me) ? 0 : nqueues;
higain = FPQueueGetMax(queues+qnum+index);
inq[qnum+index]--;
ASSERTS(higain != -1);
/*****************/
/* make the swap */
/*****************/
vtx = rmap[higain+ptr[qnum]];
myqueue[vtx] = -1;
where[vtx] = to;
nswaps++;
nmoves++;
/* update the flows */
for (j=0; j<ncon; j++)
flows[j] += (to == me) ? nvwgt[vtx*ncon+j] : -1.0*nvwgt[vtx*ncon+j];
/* ftmp = sfavg(ncon, flows); */
for (j=0, h=0; h<ncon; h++)
if (fabs(flows[h]) > fabs(flows[j])) j = h;
ftmp = fabs(flows[j]);
if (ftmp < bestflow) {
bestflow = ftmp;
nchanges = 0;
}
else {
changes[nchanges++] = vtx;
}
SWAP(id[vtx], ed[vtx], tmp);
for (j=xadj[vtx]; j<xadj[vtx+1]; j++) {
edge = adjncy[j];
/* must compute oldgain before changing id/ed */
if (myqueue[edge] != -1) {
oldgain = ipc_factor*(float)(ed[edge]-id[edge]);
if (home[edge] == me || home[edge] == you) {
if (where[edge] == home[edge])
oldgain -= redist_factor*(float)vsize[edge];
else
oldgain += redist_factor*(float)vsize[edge];
}
}
tmp = (to == where[edge] ? adjwgt[j] : -adjwgt[j]);
INC_DEC(id[edge], ed[edge], tmp);
if (myqueue[edge] != -1) {
newgain = ipc_factor*(float)(ed[edge]-id[edge]);
if (home[edge] == me || home[edge] == you) {
if (where[edge] == home[edge])
newgain -= redist_factor*(float)vsize[edge];
else
newgain += redist_factor*(float)vsize[edge];
}
FPQueueUpdate(queues+hval[edge]+(nqueues*myqueue[edge]),
map[edge]-ptr[hval[edge]], oldgain, newgain);
}
}
}
/****************************/
/* now go back to best flow */
/****************************/
nswaps -= nchanges;
nmoves -= nchanges;
for (i=0; i<nchanges; i++) {
vtx = changes[i];
from = where[vtx];
where[vtx] = to = (from == me) ? you : me;
SWAP(id[vtx], ed[vtx], tmp);
for (j=xadj[vtx]; j<xadj[vtx+1]; j++) {
edge = adjncy[j];
tmp = (to == where[edge] ? adjwgt[j] : -adjwgt[j]);
INC_DEC(id[edge], ed[edge], tmp);
}
}
for (i=0; i<nqueues; i++) {
if (nvpq[i] > 0) {
FPQueueReset(queues+i);
FPQueueReset(queues+i+nqueues);
}
}
if (nmoves == 0)
break;
}
/***************************/
/* compute 2-way imbalance */
/***************************/
sset(ncon, 0.0, my_wgt);
for (i=0; i<nvtxs; i++)
if (where[i] == me)
for (h=0; h<ncon; h++)
my_wgt[h] += nvwgt[i*ncon+h];
for (i=0; i<ncon; i++) {
ftmp = (pwgts[i]+pwgts[ncon+i])/2.0;
if (ftmp != 0.0)
lbvec[i] = fabs(my_wgt[i]-tpwgts[i]) / ftmp;
else
lbvec[i] = 0.0;
}
lbavg = savg(ncon, lbvec);
*diff_lbavg = lbavg;
/****************/
/* compute cost */
/****************/
cut = totalv = 0;
for (i=0; i<nvtxs; i++) {
if (where[i] != home[i])
totalv += vsize[i];
for (j=xadj[i]; j<xadj[i+1]; j++)
if (where[adjncy[j]] != where[i])
cut += adjwgt[j];
}
cut /= 2;
mycost = cut*ipc_factor + totalv*redist_factor;
*diff_cost = mycost;
/* free memory */
for (i=0; i<nqueues; i++)
if (nvpq[i] > 0) {
FPQueueFree(queues+i);
FPQueueFree(queues+i+nqueues);
}
GKfree((void **)&hval, (void **)&nvpq, (void **)&ptr, (void **)&inq, (void **)&queues, LTERM);
return nswaps;
}
