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/*
* pspases.c
*
* This file contains ordering routines that are to be used with the
* parallel Cholesky factorization code PSPASES
*
* Started 10/14/97
* George
*
* $Id: pspases.c 10535 2011-07-11 04:29:44Z karypis $
*
*/
#include <parmetislib.h>
/***********************************************************************************
* This function is the entry point of the serial ordering algorithm.
************************************************************************************/
int ParMETIS_SerialNodeND(idx_t *vtxdist, idx_t *xadj, idx_t *adjncy,
idx_t *numflag, idx_t *options, idx_t *order, idx_t *sizes,
MPI_Comm *comm)
{
idx_t i, npes, mype;
ctrl_t *ctrl=NULL;
graph_t *agraph=NULL;
idx_t *perm=NULL, *iperm=NULL;
idx_t *sendcount, *displs;
/* Setup the ctrl */
ctrl = SetupCtrl(PARMETIS_OP_OMETIS, options, 1, 1, NULL, NULL, *comm);
npes = ctrl->npes;
mype = ctrl->mype;
if (!ispow2(npes)) {
if (mype == 0)
printf("Error: The number of processors must be a power of 2!\n");
FreeCtrl(&ctrl);
return METIS_ERROR;
}
if (*numflag > 0)
ChangeNumbering(vtxdist, xadj, adjncy, order, npes, mype, 1);
STARTTIMER(ctrl, ctrl->TotalTmr);
STARTTIMER(ctrl, ctrl->MoveTmr);
agraph = AssembleEntireGraph(ctrl, vtxdist, xadj, adjncy);
STOPTIMER(ctrl, ctrl->MoveTmr);
if (mype == 0) {
perm = imalloc(agraph->nvtxs, "PAROMETISS: perm");
iperm = imalloc(agraph->nvtxs, "PAROMETISS: iperm");
METIS_NodeNDP(agraph->nvtxs, agraph->xadj, agraph->adjncy,
agraph->vwgt, npes, NULL, perm, iperm, sizes);
}
STARTTIMER(ctrl, ctrl->MoveTmr);
/* Broadcast the sizes array */
gkMPI_Bcast((void *)sizes, 2*npes, IDX_T, 0, ctrl->gcomm);
/* Scatter the iperm */
sendcount = imalloc(npes, "PAROMETISS: sendcount");
displs = imalloc(npes, "PAROMETISS: displs");
for (i=0; i<npes; i++) {
sendcount[i] = vtxdist[i+1]-vtxdist[i];
displs[i] = vtxdist[i];
}
gkMPI_Scatterv((void *)iperm, sendcount, displs, IDX_T, (void *)order,
vtxdist[mype+1]-vtxdist[mype], IDX_T, 0, ctrl->gcomm);
STOPTIMER(ctrl, ctrl->MoveTmr);
STOPTIMER(ctrl, ctrl->TotalTmr);
IFSET(ctrl->dbglvl, DBG_TIME, PrintTimingInfo(ctrl));
IFSET(ctrl->dbglvl, DBG_TIME, gkMPI_Barrier(ctrl->gcomm));
gk_free((void **)&agraph->xadj, &agraph->adjncy, &perm, &iperm,
&sendcount, &displs, &agraph, LTERM);
if (*numflag > 0)
ChangeNumbering(vtxdist, xadj, adjncy, order, npes, mype, 0);
goto DONE;
DONE:
FreeCtrl(&ctrl);
return METIS_OK;
}
/*************************************************************************
* This function assembles the graph into a single processor
**************************************************************************/
graph_t *AssembleEntireGraph(ctrl_t *ctrl, idx_t *vtxdist, idx_t *xadj, idx_t *adjncy)
{
idx_t i, gnvtxs, nvtxs, gnedges, nedges;
idx_t npes = ctrl->npes, mype = ctrl->mype;
idx_t *axadj, *aadjncy;
idx_t *recvcounts, *displs;
graph_t *agraph;
gnvtxs = vtxdist[npes];
nvtxs = vtxdist[mype+1]-vtxdist[mype];
nedges = xadj[nvtxs];
recvcounts = imalloc(npes, "AssembleGraph: recvcounts");
displs = imalloc(npes+1, "AssembleGraph: displs");
/* Gather all the xadj arrays first */
for (i=0; i<nvtxs; i++)
xadj[i] = xadj[i+1]-xadj[i];
axadj = imalloc(gnvtxs+1, "AssembleEntireGraph: axadj");
for (i=0; i<npes; i++) {
recvcounts[i] = vtxdist[i+1]-vtxdist[i];
displs[i] = vtxdist[i];
}
/* Assemble the xadj and then the adjncy */
gkMPI_Gatherv((void *)xadj, nvtxs, IDX_T, axadj, recvcounts, displs,
IDX_T, 0, ctrl->comm);
MAKECSR(i, nvtxs, xadj);
MAKECSR(i, gnvtxs, axadj);
/* Gather all the adjncy arrays next */
/* Determine the # of edges stored at each processor */
gkMPI_Allgather((void *)(&nedges), 1, IDX_T, (void *)recvcounts, 1, IDX_T, ctrl->comm);
displs[0] = 0;
for (i=1; i<npes+1; i++)
displs[i] = displs[i-1] + recvcounts[i-1];
gnedges = displs[npes];
aadjncy = imalloc(gnedges, "AssembleEntireGraph: aadjncy");
/* Assemble the xadj and then the adjncy */
gkMPI_Gatherv((void *)adjncy, nedges, IDX_T, aadjncy, recvcounts, displs, IDX_T, 0, ctrl->comm);
/* myprintf(ctrl, "Gnvtxs: %"PRIDX", Gnedges: %"PRIDX"\n", gnvtxs, gnedges); */
agraph = CreateGraph();
agraph->nvtxs = gnvtxs;
agraph->nedges = gnedges;
agraph->xadj = axadj;
agraph->adjncy = aadjncy;
return agraph;
}
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