int
SCOTCH_dgraphHalo (
SCOTCH_Dgraph * const grafptr,
void * const datatab,
const MPI_Datatype typeval)
{
return (dgraphHaloSync ((Dgraph *) grafptr, (byte *) datatab, typeval));
}
int
bdgraphBipartSq (
Bdgraph * const dgrfptr, /*+ Distributed graph +*/
const BdgraphBipartSqParam * const paraptr) /*+ Method parameters +*/
{
Bgraph cgrfdat; /* Centralized bipartitioned graph structure */
Gnum reduloctab[6]; /* Local array for best bipartition data (7 for Bcast) */
Gnum reduglbtab[6]; /* Global array for best bipartition data */
MPI_Datatype besttypedat; /* Data type for finding best bipartition */
MPI_Op bestoperdat; /* Handle of MPI operator for finding best bipartition */
int bestprocnum; /* Rank of process holding best partition */
Gnum * restrict vnumloctax;
Gnum vertlocnum;
Gnum complocsize1;
Gnum complocload1;
Gnum fronlocnbr;
int o;
if ((MPI_Type_contiguous (6, GNUM_MPI, &besttypedat) != MPI_SUCCESS) ||
(MPI_Type_commit (&besttypedat) != MPI_SUCCESS) ||
(MPI_Op_create ((MPI_User_function *) bdgraphBipartSqOpBest, 1, &bestoperdat) != MPI_SUCCESS)) {
errorPrint ("bdgraphBipartSq: communication error (1)");
return (1);
}
reduloctab[0] = /* In case of error, maximum communication load */
reduloctab[1] = GNUMMAX; /* And maximum load imbalance */
reduloctab[2] = dgrfptr->s.proclocnum;
reduloctab[3] = /* Assume sequential bipartioning went fine */
reduloctab[4] = 0;
reduloctab[5] = 0; /* Assume no errors */
vnumloctax = dgrfptr->s.vnumloctax; /* No need for vertex number array when centralizing graph */
dgrfptr->s.vnumloctax = NULL;
o = bdgraphGatherAll (dgrfptr, &cgrfdat);
dgrfptr->s.vnumloctax = vnumloctax; /* Restore vertex number array */
if (o != 0) {
errorPrint ("bdgraphBipartSq: cannot build centralized graph");
return (1);
}
if (bgraphBipartSt (&cgrfdat, paraptr->strat) != 0) { /* Bipartition centralized graph */
errorPrint ("bdgraphBipartSq: cannot bipartition centralized graph");
reduloctab[3] =
reduloctab[4] = 1;
}
else { /* Fill local array with local bipartition data */
reduloctab[0] = ((cgrfdat.fronnbr != 0) || ((cgrfdat.compsize0 != 0) && ((cgrfdat.s.vertnbr - cgrfdat.compsize0) != 0)))
? cgrfdat.commload
: GNUMMAX; /* Partitions with empty bipartitions unwanted if they are completely unbalanced */
reduloctab[1] = cgrfdat.compload0dlt;
}
if (dgrfptr->partgsttax == NULL) {
if (dgraphGhst (&dgrfptr->s) != 0) { /* Compute ghost edge array if not already present, before copying graph fields */
errorPrint ("bdgraphBipartSq: cannot compute ghost edge array");
reduloctab[5] = 1;
}
else {
if ((dgrfptr->partgsttax = (GraphPart *) memAlloc (dgrfptr->s.vertgstnbr * sizeof (GraphPart))) == NULL) {
errorPrint ("bdgraphBipartSq: out of memory (1)");
reduloctab[5] = 1; /* Allocated data will be freed along with graph structure */
}
dgrfptr->partgsttax -= dgrfptr->s.baseval;
}
if ((dgrfptr->fronloctab = (Gnum *) memAlloc (dgrfptr->s.vertlocnbr * sizeof (Gnum))) == NULL) {
errorPrint ("bdgraphBipartSq: out of memory (2)");
reduloctab[5] = 1;
}
}
if (MPI_Allreduce (reduloctab, reduglbtab, 1, besttypedat, bestoperdat, dgrfptr->s.proccomm) != MPI_SUCCESS) {
errorPrint ("bdgraphBipartSq: communication error (2)");
return (1);
}
if ((reduloctab[4] != 0) && (reduloctab[4] != dgrfptr->s.procglbnbr)) {
errorPrint ("bdgraphBipartSq: internal error");
return (1);
}
if ((MPI_Op_free (&bestoperdat) != MPI_SUCCESS) ||
(MPI_Type_free (&besttypedat) != MPI_SUCCESS)) {
errorPrint ("bdgraphBipartSq: communication error (3)");
return (1);
}
if (reduglbtab[3] != 0) { /* If none of the sequential methods succeeded */
bgraphExit (&cgrfdat);
return (1);
}
bestprocnum = (int) reduglbtab[2];
if (dgrfptr->s.proclocnum == bestprocnum) { /* If process holds best partition */
reduloctab[0] = cgrfdat.compload0; /* Global values to share */
reduloctab[1] = cgrfdat.compsize0;
reduloctab[2] = cgrfdat.commload;
reduloctab[3] = cgrfdat.commgainextn;
reduloctab[4] = cgrfdat.fronnbr;
}
if (MPI_Bcast (reduloctab, 5, GNUM_MPI, bestprocnum, dgrfptr->s.proccomm) != MPI_SUCCESS) {
errorPrint ("bdgraphBipartSq: communication error (4)");
return (1);
}
dgrfptr->compglbload0 = reduloctab[0];
dgrfptr->compglbload0dlt = reduloctab[0] - dgrfptr->compglbload0avg;
dgrfptr->compglbsize0 = reduloctab[1];
dgrfptr->commglbload = reduloctab[2];
dgrfptr->commglbgainextn = reduloctab[3];
dgrfptr->fronglbnbr = reduloctab[4];
if (commScatterv (cgrfdat.parttax, dgrfptr->s.proccnttab, dgrfptr->s.procdsptab, GRAPHPART_MPI, /* No base for sending as procdsptab holds based values */
dgrfptr->partgsttax + dgrfptr->s.baseval, dgrfptr->s.vertlocnbr, GRAPHPART_MPI,
bestprocnum, dgrfptr->s.proccomm) != MPI_SUCCESS) {
errorPrint ("bdgraphBipartSq: communication error (5)");
return (1);
}
if (dgraphHaloSync (&dgrfptr->s, (byte *) (dgrfptr->partgsttax + dgrfptr->s.baseval), GRAPHPART_MPI) != 0) {
errorPrint ("bdgraphBipartSq: cannot perform halo exchange");
return (1);
}
complocsize1 =
complocload1 = 0;
for (vertlocnum = dgrfptr->s.baseval, fronlocnbr = 0;
vertlocnum < dgrfptr->s.vertlocnnd; vertlocnum ++) {
int partval;
Gnum partval1;
Gnum commcut;
Gnum edgelocnum;
partval = dgrfptr->partgsttax[vertlocnum];
partval1 = partval & 1;
complocsize1 += partval1; /* Superscalar update */
if (dgrfptr->s.veloloctax != NULL) {
Gnum veloval;
veloval = dgrfptr->s.veloloctax[vertlocnum];
complocload1 += (-partval1) & veloval; /* Superscalar update */
}
for (edgelocnum = dgrfptr->s.vertloctax[vertlocnum], commcut = 0;
edgelocnum < dgrfptr->s.vendloctax[vertlocnum]; edgelocnum ++) { /* Build local frontier */
int partend;
int partdlt;
partend = dgrfptr->partgsttax[dgrfptr->s.edgegsttax[edgelocnum]];
partdlt = partval ^ partend;
commcut |= partdlt;
}
if (commcut != 0)
dgrfptr->fronloctab[fronlocnbr ++] = vertlocnum;
}
dgrfptr->fronlocnbr = fronlocnbr;
dgrfptr->complocsize0 = dgrfptr->s.vertlocnbr - complocsize1;
dgrfptr->complocload0 = (dgrfptr->s.veloloctax != NULL) ? (dgrfptr->s.velolocsum - complocload1) : dgrfptr->complocsize0;
bgraphExit (&cgrfdat);
#ifdef SCOTCH_DEBUG_BDGRAPH2
if (bdgraphCheck (dgrfptr) != 0) {
errorPrint ("bdgraphBipartSq: inconsistent graph data");
return (1);
}
#endif /* SCOTCH_DEBUG_BDGRAPH2 */
return (0);
}
int
bdgraphBipartDf (
Bdgraph * const grafptr, /*+ Distributed graph +*/
const BdgraphBipartDfParam * const paraptr) /*+ Method parameters +*/
{
float * restrict ielsloctax; /* Inverse of degree array */
float * restrict veexloctax; /* Veexval over domdist */
float * restrict difogsttax; /* Old diffusion value array */
float * restrict difngsttax; /* New diffusion value array */
const Gnum * restrict edgegsttax;
Gnum fronlocnum;
Gnum veexlocnbr;
float vanclocval[2];
float valolocval[2]; /* Fraction of load to remove from anchor vertices at each step */
Gnum vanclocnnd;
Gnum vertlocnum;
const Gnum * restrict velolocbax;
Gnum velolocmsk;
const Gnum * restrict edlolocbax;
Gnum edlolocmsk;
Gnum complocload1;
Gnum complocsize1;
Gnum commlocloadintn;
Gnum commlocloadextn;
Gnum commlocgainextn;
Gnum reduloctab[6];
Gnum reduglbtab[6];
Gnum passnum;
float cdifval;
float cremval;
int ovflval; /* Overflow flag value */
if (dgraphGhst (&grafptr->s) != 0) { /* Compute ghost edge array if not already present */
errorPrint ("bdgraphBipartDf: cannot compute ghost edge array");
return (1);
}
reduloctab[0] = grafptr->s.vendloctax[grafptr->s.vertlocnnd - 2] - grafptr->s.vertloctax[grafptr->s.vertlocnnd - 2] - (grafptr->s.procglbnbr - 1); /* Local degree of both anchor vertices, minus edges to other anchors */
reduloctab[1] = grafptr->s.vendloctax[grafptr->s.vertlocnnd - 1] - grafptr->s.vertloctax[grafptr->s.vertlocnnd - 1] - (grafptr->s.procglbnbr - 1); /* Anchor edges have load 1 even for weighted graphs */
if (grafptr->s.veloloctax == NULL)
reduloctab[2] = /* Weights of anchors */
reduloctab[3] = 1;
else {
reduloctab[2] = grafptr->s.veloloctax[grafptr->s.vertlocnnd - 2];
reduloctab[3] = grafptr->s.veloloctax[grafptr->s.vertlocnnd - 1];
}
veexlocnbr = (grafptr->veexloctax != NULL) ? grafptr->s.vertlocnbr : 0;
if (memAllocGroup ((void **) (void *)
&ielsloctax, (size_t) (grafptr->s.vertlocnbr * sizeof (float)),
&veexloctax, (size_t) (veexlocnbr * sizeof (float)),
&difogsttax, (size_t) (grafptr->s.vertgstnbr * sizeof (float)),
&difngsttax, (size_t) (grafptr->s.vertgstnbr * sizeof (float)), NULL) == NULL) {
errorPrint ("bdgraphBipartDf: out of memory");
reduloctab[0] = -1;
}
ielsloctax -= grafptr->s.baseval;
difogsttax -= grafptr->s.baseval;
difngsttax -= grafptr->s.baseval;
veexloctax = (grafptr->veexloctax != NULL) ? (veexloctax - grafptr->s.baseval) : NULL;
if (MPI_Allreduce (reduloctab, reduglbtab, 4, GNUM_MPI, MPI_SUM, grafptr->s.proccomm) != MPI_SUCCESS) {
errorPrint ("bdgraphBipartDf: communication error (1)");
return (1);
}
if (reduglbtab[0] < 0) {
if (ielsloctax != NULL)
memFree (ielsloctax + grafptr->s.baseval); /* Free group leader */
return (1);
}
if ((reduglbtab[0] == 0) || /* If graph is too small to have any usable anchors, leave partition as is */
(reduglbtab[1] == 0)) {
memFree (ielsloctax + grafptr->s.baseval);
if (dgraphHaloSync (&grafptr->s, (byte *) (void *) (grafptr->partgsttax + grafptr->s.baseval), GRAPHPART_MPI) != 0) {
errorPrint ("bdgraphBipartDf: cannot propagate part data (1)");
return (1);
}
return (0);
}
vanclocval[0] = (float) ((paraptr->typeval == BDGRAPHBIPARTDFTYPEBAL) /* If balanced parts wanted */
? grafptr->compglbload0avg /* Target is average */
: ( (grafptr->compglbload0 < grafptr->compglbload0min) ? grafptr->compglbload0min : /* Else keep load if not off balance */
((grafptr->compglbload0 > grafptr->compglbload0max) ? grafptr->compglbload0max : grafptr->compglbload0)));
vanclocval[1] = (float) grafptr->s.veloglbsum - vanclocval[0];
vanclocval[0] = - vanclocval[0]; /* Part 0 holds negative values */
valolocval[0] = (float) reduglbtab[2]; /* Compute values to remove from anchor vertices */
valolocval[1] = (float) reduglbtab[3] - BDGRAPHBIPARTDFEPSILON; /* Slightly tilt value to add to part 1 */
vanclocnnd = grafptr->s.vertlocnnd - 2; /* Do not account for anchor vertices in diffusion computations */
if (grafptr->s.edloloctax != NULL) {
for (vertlocnum = grafptr->s.baseval; vertlocnum < vanclocnnd; vertlocnum ++) {
Gnum edgelocnum;
Gnum edgelocnnd;
Gnum edlolocsum;
#ifdef SCOTCH_DEBUG_BDGRAPH2
if ((grafptr->s.vendloctax[vertlocnum] - grafptr->s.vertloctax[vertlocnum]) == 0) {
errorPrint ("bdgraphBipartDf: internal error (1)");
return (1);
}
#endif /* SCOTCH_DEBUG_BDGRAPH2 */
difogsttax[vertlocnum] = 0.0F;
for (edgelocnum = grafptr->s.vertloctax[vertlocnum], edgelocnnd = grafptr->s.vendloctax[vertlocnum], edlolocsum = 0;
edgelocnum < edgelocnnd; edgelocnum ++)
edlolocsum += grafptr->s.edloloctax[edgelocnum];
ielsloctax[vertlocnum] = 1.0F / (float) edlolocsum;
}
}
else { /* Graph has no edge loads */
for (vertlocnum = grafptr->s.baseval; vertlocnum < vanclocnnd; vertlocnum ++) {
#ifdef SCOTCH_DEBUG_BDGRAPH2
if ((grafptr->s.vendloctax[vertlocnum] - grafptr->s.vertloctax[vertlocnum]) == 0) {
errorPrint ("bdgraphBipartDf: internal error (2)");
return (1);
}
#endif /* SCOTCH_DEBUG_BDGRAPH2 */
ielsloctax[vertlocnum] = 1.0F / (float) (grafptr->s.vendloctax[vertlocnum] - grafptr->s.vertloctax[vertlocnum]);
difogsttax[vertlocnum] = 0.0F;
}
}
ielsloctax[vanclocnnd] = 1.0F / (float) reduglbtab[0];
ielsloctax[vanclocnnd + 1] = 1.0F / (float) reduglbtab[1];
difogsttax[vanclocnnd] = vanclocval[0] * ielsloctax[vanclocnnd]; /* Load anchor vertices for first pass */
difogsttax[vanclocnnd + 1] = vanclocval[1] * ielsloctax[vanclocnnd + 1];
difngsttax[vanclocnnd] = /* In case of isolated anchors, do not risk overflow because of NaN */
difngsttax[vanclocnnd + 1] = 0.0F;
if (dgraphHaloSync (&grafptr->s, (byte *) (void *) (difogsttax + grafptr->s.baseval), MPI_FLOAT) != 0) { /* Perform initial diffusion (and build communication structures) */
errorPrint ("bdgraphBipartDf: cannot propagate diffusion data (1)");
memFree (ielsloctax + grafptr->s.baseval); /* Free group leader */
return (1);
}
ovflval = 0;
cdifval = paraptr->cdifval;
cremval = paraptr->cremval;
edgegsttax = grafptr->s.edgegsttax;
for (passnum = 0; ; ) { /* For all passes */
if (ovflval == 0) { /* If no overflow occured */
float * diftgsttax; /* Temporary swap value */
Gnum vertlocnum;
float veloval;
veloval = 1.0F; /* Assume no vertex loads */
for (vertlocnum = grafptr->s.baseval; vertlocnum < vanclocnnd; vertlocnum ++) {
Gnum edgelocnum;
Gnum edgelocnnd;
float diffval;
diffval = 0.0F;
edgelocnum = grafptr->s.vertloctax[vertlocnum];
edgelocnnd = grafptr->s.vendloctax[vertlocnum];
if (grafptr->s.edloloctax != NULL)
for ( ; edgelocnum < edgelocnnd; edgelocnum ++)
diffval += difogsttax[edgegsttax[edgelocnum]] * (float) grafptr->s.edloloctax[edgelocnum];
else
for ( ; edgelocnum < edgelocnnd; edgelocnum ++)
diffval += difogsttax[edgegsttax[edgelocnum]];
diffval *= cdifval;
diffval += (difogsttax[vertlocnum] * cremval) / ielsloctax[vertlocnum];
if (grafptr->s.veloloctax != NULL)
veloval = (float) grafptr->s.veloloctax[vertlocnum];
if (diffval >= 0.0F) {
diffval = (diffval - veloval) * ielsloctax[vertlocnum];
if (diffval <= 0.0F)
diffval = +BDGRAPHBIPARTDFEPSILON;
}
else {
diffval = (diffval + veloval) * ielsloctax[vertlocnum];
if (diffval >= 0.0F)
diffval = -BDGRAPHBIPARTDFEPSILON;
}
if (isnan (diffval)) { /* If overflow occured */
ovflval = 1; /* We are in state of overflow */
goto abort; /* Exit this loop without swapping arrays */
}
difngsttax[vertlocnum] = diffval;
}
for ( ; vertlocnum < grafptr->s.vertlocnnd; vertlocnum ++) { /* For the two local anchor vertices */
Gnum edgelocnum;
Gnum edgelocnnd;
float diffval;
diffval = 0.0F;
edgelocnum = grafptr->s.vertloctax[vertlocnum] + grafptr->s.procglbnbr - 1; /* Skip links to other anchors */
edgelocnnd = grafptr->s.vendloctax[vertlocnum];
if (edgelocnum == edgelocnnd) /* If isolated anchor */
continue; /* Barrel is empty */
for ( ; edgelocnum < edgelocnnd; edgelocnum ++) /* Anchor edges have load 1 even for weighted graphs */
diffval += difogsttax[edgegsttax[edgelocnum]];
diffval *= cdifval;
diffval += vanclocval[vertlocnum - vanclocnnd] + (difogsttax[vertlocnum] * cremval) / ielsloctax[vertlocnum];
if (diffval >= 0.0F) {
diffval = (diffval - valolocval[vertlocnum - vanclocnnd]) * ielsloctax[vertlocnum];
if (diffval <= 0.0F)
diffval = +BDGRAPHBIPARTDFEPSILON;
}
else {
diffval = (diffval + valolocval[vertlocnum - vanclocnnd]) * ielsloctax[vertlocnum];
if (diffval >= 0.0F)
diffval = -BDGRAPHBIPARTDFEPSILON;
}
if (isnan (diffval)) { /* If overflow occured */
ovflval = 1; /* We are in state of overflow */
goto abort; /* Exit this loop without swapping arrays */
}
difngsttax[vertlocnum] = diffval;
}
diftgsttax = (float *) difngsttax; /* Swap old and new diffusion arrays */
difngsttax = (float *) difogsttax; /* Casts to prevent IBM compiler from yelling */
difogsttax = (float *) diftgsttax;
}
abort : /* If overflow occured, resume here */
if (++ passnum >= paraptr->passnbr) /* If maximum number of passes reached */
break; /* Exit main loop */
if (dgraphHaloSync (&grafptr->s, (byte *) (void *) (difogsttax + grafptr->s.baseval), MPI_FLOAT) != 0) {
errorPrint ("bdgraphBipartDf: cannot propagate diffusion data (2)");
memFree (ielsloctax + grafptr->s.baseval); /* Free group leader */
return (1);
}
}
for (vertlocnum = grafptr->s.baseval; vertlocnum < vanclocnnd; vertlocnum ++) /* Set new part distribution */
grafptr->partgsttax[vertlocnum] = (difogsttax[vertlocnum] <= 0.0F) ? 0 : 1;
grafptr->partgsttax[vanclocnnd] = 0; /* Set up parts in case anchors are isolated */
grafptr->partgsttax[vanclocnnd + 1] = 1;
if (grafptr->s.veloloctax != NULL) {
velolocbax = grafptr->s.veloloctax;
velolocmsk = ~((Gnum) 0);
}
else {
velolocbax = &bdgraphbipartdfloadone;
velolocmsk = 0;
}
if (grafptr->s.edloloctax != NULL) {
edlolocbax = grafptr->s.edloloctax;
edlolocmsk = ~((Gnum) 0);
}
else {
edlolocbax = &bdgraphbipartdfloadone;
edlolocmsk = 0;
}
memFree (ielsloctax + grafptr->s.baseval); /* Free group leader */
if (dgraphHaloSync (&grafptr->s, (byte *) (void *) (grafptr->partgsttax + grafptr->s.baseval), GRAPHPART_MPI) != 0) {
errorPrint ("bdgraphBipartDf: cannot propagate part data (2)");
return (1);
}
commlocloadintn =
commlocloadextn =
commlocgainextn = 0;
for (vertlocnum = grafptr->s.baseval, fronlocnum = complocsize1 = complocload1 = 0;
vertlocnum < grafptr->s.vertlocnnd; vertlocnum ++) {
Gnum edgelocnum;
Gnum edgelocnnd;
Gnum veloval;
Gnum partval;
Gnum flagval;
#ifdef SCOTCH_DEBUG_BDGRAPH2
if (grafptr->partgsttax[vertlocnum] > 1) {
errorPrint ("bdgraphBipartDf: internal error (3)");
break; /* Do not break upcoming collective communications */
}
#endif /* SCOTCH_DEBUG_BDGRAPH2 */
partval = (Gnum) grafptr->partgsttax[vertlocnum];
veloval = velolocbax[vertlocnum & velolocmsk];
if (grafptr->veexloctax != NULL) {
commlocloadextn += grafptr->veexloctax[vertlocnum] * partval;
commlocgainextn += grafptr->veexloctax[vertlocnum] * (1 - partval * 2);
}
complocsize1 += partval;
complocload1 += partval * veloval;
flagval = 0;
for (edgelocnum = grafptr->s.vertloctax[vertlocnum], edgelocnnd = grafptr->s.vendloctax[vertlocnum];
edgelocnum < edgelocnnd; edgelocnum ++) {
Gnum edloval;
Gnum partend;
partend = (Gnum) grafptr->partgsttax[edgegsttax[edgelocnum]];
#ifdef SCOTCH_DEBUG_BDGRAPH2
if (partend > 1) {
errorPrint ("bdgraphBipartDf: internal error (4)");
vertlocnum = grafptr->s.vertlocnnd;
break; /* Do not break upcoming collective communications */
}
#endif /* SCOTCH_DEBUG_BDGRAPH2 */
edloval = edlolocbax[edgelocnum & edlolocmsk];
flagval |= partval ^ partend;
commlocloadintn += (partval ^ partend) * edloval; /* Internal load is accounted for twice */
}
if (flagval != 0) /* If vertex has neighbors in other part */
grafptr->fronloctab[fronlocnum ++] = vertlocnum; /* Record it as member of separator */
}
grafptr->complocload0 = grafptr->s.velolocsum - complocload1;
grafptr->complocsize0 = grafptr->s.vertlocnbr - complocsize1;
grafptr->fronlocnbr = fronlocnum;
reduloctab[0] = fronlocnum;
reduloctab[1] = grafptr->complocload0;
reduloctab[2] = grafptr->complocsize0;
reduloctab[3] = commlocloadintn; /* Twice the internal load; sum globally before dividing by two */
reduloctab[4] = commlocloadextn;
reduloctab[5] = commlocgainextn;
if (MPI_Allreduce (&reduloctab[0], &reduglbtab[0], 6, GNUM_MPI, MPI_SUM, grafptr->s.proccomm) != MPI_SUCCESS) {
errorPrint ("bdgraphBipartDf: communication error (2)");
return (1);
}
grafptr->fronglbnbr = reduglbtab[0];
grafptr->compglbload0 = reduglbtab[1];
grafptr->compglbload0dlt = grafptr->compglbload0 - grafptr->compglbload0avg;
grafptr->compglbsize0 = reduglbtab[2];
grafptr->commglbload = (reduglbtab[3] / 2) * grafptr->domdist + reduglbtab[4];
grafptr->commglbgainextn = reduglbtab[5];
#ifdef SCOTCH_DEBUG_BDGRAPH2
if (bdgraphCheck (grafptr) != 0) {
errorPrint ("bdgraphBipartDf: internal error (5)");
return (1);
}
#endif /* SCOTCH_DEBUG_BDGRAPH2 */
return (0);
}
