From 69f2911e04ffb1b19eef1fafb8c040af271f656e Mon Sep 17 00:00:00 2001
From: Tor Aamodt <aamodt@ece.ubc.ca>
Date: Thu, 15 Jul 2010 18:09:46 -0800
Subject: creating branch for adding support for CUDA 3.x and Fermi

[git-p4: depot-paths = "//depot/gpgpu_sim_research/fermi/distribution/": change = 6829]
---
 .../DG/3rdParty/ParMetis-3.1/METISLib/mbalance.c   | 260 +++++++++++++++++++++
 1 file changed, 260 insertions(+)
 create mode 100644 benchmarks/CUDA/DG/3rdParty/ParMetis-3.1/METISLib/mbalance.c

(limited to 'benchmarks/CUDA/DG/3rdParty/ParMetis-3.1/METISLib/mbalance.c')

diff --git a/benchmarks/CUDA/DG/3rdParty/ParMetis-3.1/METISLib/mbalance.c b/benchmarks/CUDA/DG/3rdParty/ParMetis-3.1/METISLib/mbalance.c
new file mode 100644
index 0000000..65e9961
--- /dev/null
+++ b/benchmarks/CUDA/DG/3rdParty/ParMetis-3.1/METISLib/mbalance.c
@@ -0,0 +1,260 @@
+/*
+ * Copyright 1997, Regents of the University of Minnesota
+ *
+ * mbalance.c
+ *
+ * This file contains code that is used to forcefully balance either
+ * bisections or k-sections
+ *
+ * Started 7/29/97
+ * George
+ *
+ * $Id: mbalance.c,v 1.1 2003/07/16 15:55:07 karypis Exp $
+ *
+ */
+
+#include <metis.h>
+
+
+/*************************************************************************
+* This function is the entry point of the bisection balancing algorithms.
+**************************************************************************/
+void MocBalance2Way(CtrlType *ctrl, GraphType *graph, float *tpwgts, float lbfactor)
+{
+
+  if (Compute2WayHLoadImbalance(graph->ncon, graph->npwgts, tpwgts) < lbfactor)
+    return;
+
+  MocGeneral2WayBalance(ctrl, graph, tpwgts, lbfactor);
+
+}
+
+
+/*************************************************************************
+* This function performs an edge-based FM refinement
+**************************************************************************/
+void MocGeneral2WayBalance(CtrlType *ctrl, GraphType *graph, float *tpwgts, float lbfactor)
+{
+  int i, ii, j, k, l, kwgt, nvtxs, ncon, nbnd, nswaps, from, to, pass, me, limit, tmp, cnum;
+  idxtype *xadj, *adjncy, *adjwgt, *where, *id, *ed, *bndptr, *bndind;
+  idxtype *moved, *swaps, *perm, *qnum;
+  float *nvwgt, *npwgts, mindiff[MAXNCON], origbal, minbal, newbal;
+  PQueueType parts[MAXNCON][2];
+  int higain, oldgain, mincut, newcut, mincutorder;
+  int qsizes[MAXNCON][2];
+
+  nvtxs = graph->nvtxs;
+  ncon = graph->ncon;
+  xadj = graph->xadj;
+  nvwgt = graph->nvwgt;
+  adjncy = graph->adjncy;
+  adjwgt = graph->adjwgt;
+  where = graph->where;
+  id = graph->id;
+  ed = graph->ed;
+  npwgts = graph->npwgts;
+  bndptr = graph->bndptr;
+  bndind = graph->bndind;
+
+  moved = idxwspacemalloc(ctrl, nvtxs);
+  swaps = idxwspacemalloc(ctrl, nvtxs);
+  perm = idxwspacemalloc(ctrl, nvtxs);
+  qnum = idxwspacemalloc(ctrl, nvtxs);
+
+  limit = amin(amax(0.01*nvtxs, 15), 100);
+
+  /* Initialize the queues */
+  for (i=0; i<ncon; i++) {
+    PQueueInit(ctrl, &parts[i][0], nvtxs, PLUS_GAINSPAN+1);
+    PQueueInit(ctrl, &parts[i][1], nvtxs, PLUS_GAINSPAN+1);
+    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]]++;
+  }
+
+/*
+  printf("Weight Distribution:    \t");
+  for (i=0; i<ncon; i++) 
+    printf(" [%d %d]", qsizes[i][0], qsizes[i][1]); 
+  printf("\n");
+*/
+
+  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;
+          }
+        }
+      }
+    }
+  }
+
+/*
+  printf("Weight Distribution (after):\t ");
+  for (i=0; i<ncon; i++) 
+    printf(" [%d %d]", qsizes[i][0], qsizes[i][1]); 
+  printf("\n");
+*/
+
+
+
+  for (i=0; i<ncon; i++) 
+    mindiff[i] = fabs(tpwgts[0]-npwgts[i]);
+  minbal = origbal = Compute2WayHLoadImbalance(ncon, npwgts, tpwgts);
+  newcut = mincut = graph->mincut;
+  mincutorder = -1;
+
+  if (ctrl->dbglvl&DBG_REFINE) {
+    printf("Parts: [");
+    for (l=0; l<ncon; l++)
+      printf("(%.3f, %.3f) ", npwgts[l], npwgts[ncon+l]);
+    printf("] T[%.3f %.3f], Nv-Nb[%5d, %5d]. ICut: %6d, LB: %.3f [B]\n", tpwgts[0], tpwgts[1], graph->nvtxs, graph->nbnd, graph->mincut, origbal);
+  }
+
+  idxset(nvtxs, -1, moved);
+
+  ASSERT(ComputeCut(graph, where) == graph->mincut);
+  ASSERT(CheckBnd(graph));
+
+  /* Insert all nodes in the priority queues */
+  nbnd = graph->nbnd;
+  RandomPermute(nvtxs, perm, 1);
+  for (ii=0; ii<nvtxs; ii++) {
+    i = perm[ii];
+    PQueueInsert(&parts[qnum[i]][where[i]], i, ed[i]-id[i]);
+  }
+
+  for (nswaps=0; nswaps<nvtxs; nswaps++) {
+    if (minbal < lbfactor)
+      break;
+
+    SelectQueue(ncon, npwgts, tpwgts, &from, &cnum, parts);
+    to = (from+1)%2;
+
+    if (from == -1 || (higain = PQueueGetMax(&parts[cnum][from])) == -1)
+      break;
+
+    saxpy(ncon, 1.0, nvwgt+higain*ncon, 1, npwgts+to*ncon, 1);
+    saxpy(ncon, -1.0, nvwgt+higain*ncon, 1, npwgts+from*ncon, 1);
+    newcut -= (ed[higain]-id[higain]);
+    newbal = Compute2WayHLoadImbalance(ncon, npwgts, tpwgts);
+
+    if (newbal < minbal || (newbal == minbal && 
+        (newcut < mincut || (newcut == mincut && BetterBalance(ncon, npwgts, tpwgts, mindiff))))) {
+      mincut = newcut;
+      minbal = newbal;
+      mincutorder = nswaps;
+      for (i=0; i<ncon; i++)
+        mindiff[i] = fabs(tpwgts[0]-npwgts[i]);
+    }
+    else if (nswaps-mincutorder > limit) { /* We hit the limit, undo last move */
+      newcut += (ed[higain]-id[higain]);
+      saxpy(ncon, 1.0, nvwgt+higain*ncon, 1, npwgts+from*ncon, 1);
+      saxpy(ncon, -1.0, nvwgt+higain*ncon, 1, npwgts+to*ncon, 1);
+      break;
+    }
+
+    where[higain] = to;
+    moved[higain] = nswaps;
+    swaps[nswaps] = higain;
+
+    if (ctrl->dbglvl&DBG_MOVEINFO) {
+      printf("Moved %6d from %d(%d). Gain: %5d, Cut: %5d, NPwgts: ", higain, from, cnum, ed[higain]-id[higain], newcut);
+      for (l=0; l<ncon; l++) 
+        printf("(%.3f, %.3f) ", npwgts[l], npwgts[ncon+l]);
+      printf(", %.3f LB: %.3f\n", minbal, newbal);
+    }
+
+
+    /**************************************************************
+    * 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)
+        PQueueUpdate(&parts[qnum[k]][where[k]], k, oldgain, 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);
+
+    saxpy(ncon, 1.0, nvwgt+higain*ncon, 1, npwgts+to*ncon, 1);
+    saxpy(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);
+    }
+  }
+
+  if (ctrl->dbglvl&DBG_REFINE) {
+    printf("\tMincut: %6d at %5d, NBND: %6d, NPwgts: [", mincut, mincutorder, nbnd);
+    for (l=0; l<ncon; l++)
+      printf("(%.3f, %.3f) ", npwgts[l], npwgts[ncon+l]);
+    printf("], LB: %.3f\n", Compute2WayHLoadImbalance(ncon, npwgts, tpwgts));
+  }
+
+  graph->mincut = mincut;
+  graph->nbnd = nbnd;
+
+
+  for (i=0; i<ncon; i++) {
+    PQueueFree(ctrl, &parts[i][0]);
+    PQueueFree(ctrl, &parts[i][1]);
+  }
+
+  idxwspacefree(ctrl, nvtxs);
+  idxwspacefree(ctrl, nvtxs);
+  idxwspacefree(ctrl, nvtxs);
+  idxwspacefree(ctrl, nvtxs);
+
+}
+
-- 
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