Originally posted by: Kagan
I have the new CPLEX Optimization Studio version 12.2.0.2 -b13 running on Windows 7 Professional x64, with 6GB of RAM. I am trying to run the attached .mod file, which runs fine in version 12.1 (OPL version 6.3), but I am getting the following engine log,
Tried aggregator 2 times.
MIP Presolve eliminated 85 rows and 1 columns.
MIP Presolve modified 10 coefficients.
Aggregator did 17 substitutions.
Reduced MIP has 1831 rows, 1356 columns, and 13700 nonzeros.
Reduced MIP has 615 binaries, 0 generals, 0 SOSs, and 0 indicators.
Probing fixed 0 vars, tightened 12 bounds.
Probing time = 0.03 sec.
Tried aggregator 1 time.
Presolve time = 0.06 sec.
Probing time = 0.00 sec.
Clique table members: 2506.
MIP emphasis: balance optimality and feasibility.
MIP search method: dynamic search.
Parallel mode: deterministic, using up to 4 threads.
Root relaxation solution time = 0.09 sec.
Nodes Cuts/
Node Left Objective IInf Best Integer Best Node ItCnt Gap
0+ 0 0.0000 1485 ---
0 0 1.7544 118 0.0000 1.7544 1485 ---
0 0 1.7544 93 0.0000 Cuts: 47 1587 ---
0 0 1.7544 155 0.0000 Cuts: 111 1801 ---
0 0 1.7544 123 0.0000 Cuts: 10 1901 ---
0 0 1.7544 109 0.0000 Cuts: 38 1975 ---
0 0 1.7544 135 0.0000 Cuts: 54 2051 ---
0 2 1.7544 123 0.0000 1.7544 2051 ---
Elapsed real time = 1.45 sec. (tree size = 0.01 MB, solutions = 1)
30 32 1.5383 65 0.0000 1.7544 8642 ---
76 76 1.5998 70 0.0000 1.7544 13754 ---
240 194 1.7544 117 0.0000 1.7544 25345 ---
353 266 1.7543 112 0.0000 1.7544 31730 ---
543 426 0.8887 73 0.0000 1.7544 39061 ---
548 431 1.7544 135 0.0000 1.7544 61046 ---
551 432 1.7544 154 0.0000 1.7544 61904 ---
557 436 1.7544 251 0.0000 1.7544 68526 ---
561 439 1.7544 333 0.0000 1.7544 73363 ---
570 418 1.7544 247 0.0000 1.7544 81920 ---
Elapsed real time = 29.98 sec. (tree size = 8.41 MB, solutions = 1)
631 274 1.7544 261 0.0000 1.7544 90532 ---
732 216 1.7544 247 0.0000 1.7544 103177 ---
782 202 1.7544 261 0.0000 1.7544 113983 ---
850 198 1.7544 283 0.0000 1.7544 134723 ---
913 204 1.7544 280 0.0000 1.7544 145253 ---
1030 284 1.7544 298 0.0000 1.7544 167275 ---
1132 358 1.7544 224 0.0000 1.7544 186906 ---
1281 505 1.7544 289 0.0000 1.7544 198000 ---
1441 615 1.7544 281 0.0000 1.7544 218525 ---
1690 823 1.7544 286 0.0000 1.7544 242802 ---
Elapsed real time = 71.84 sec. (tree size = 2.43 MB, solutions = 36)
2113 1220 1.7544 241 0.0000 1.7544 283954 ---
2178 1271 1.7544 240 0.0000 1.7544 321718 ---
2225 1316 1.7544 245 0.0000 1.7544 341253 ---
2347 1421 1.7544 255 0.0000 1.7544 375297 ---
2633 1699 1.7544 289 0.0000 1.7544 413471 ---
2837 1891 1.7544 259 0.0000 1.7544 430832 ---
2841 1895 1.7544 260 0.0000 1.7544 438507 ---
3193 2209 1.7544 242 0.0000 1.7544 477581 ---
3313 2317 1.7544 237 0.0000 1.7544 504852 ---
There may be further error information in the clone logs.
Clique cuts applied: 32
Implied bound cuts applied: 189
Flow cuts applied: 8
Mixed integer rounding cuts applied: 20
Gomory fractional cuts applied: 11
Root node processing (before b&c):
Real time = 1.39
Parallel b&c, 4 threads:
Real time = 100.70
Sync time (average) = 14.11
Wait time (average) = 0.00
Total (root+branch&cut) = 102.09 sec.
with the following problem.
Description Resource Path Location Type
fl in EPeriods; dvar float+ finNodes; dvar float+ foutNodesPeriods; dvar float+ qNodesPeriods; dvar float+ m; maximize m-0.000001*sum(i in Nodes, t in Periods) q[i][t]; subject to { sum(i in Nodes)y[i]==1; forall (l in E,t in Periods) linkcapacity: f[l][t] <=l.c/T*x[l][t]; forall (i in Nodes) inputtraffic: fin[i]==p[i]*m/T; forall(i in Nodes, t in Periods) outputlimit: fout[i][t]<=a/T*y[i]; forall(i in Nodes,t in 2..T) flowbalance: q[i]t-1fin[i] sum(<s,i,c> in E) f<s,i,c>[t]==fout[i][t]+sum(<i,d,c> in E) f<i,d,c>[t]+q[i][t]; forall(i in Nodes) flowbalanceend: q[i][T]+fin[i]+ sum(<s,i,c> in E) f<s,i,c>[1]==fout[i][1]+sum(<i,d,c> in E) f<i,d,c>[1]+q[i][1]; forall(i in Nodes, t in Periods) queuecapacity: q[i][t]<=beta[i]; forall(i in Nodes) singleroute: sum(<i,d,c> in E) z<i,d,c>== 1-y[i]; forall(t in Periods, l in E) singleroute2: x[l][t]<=z[l]; forall (i in Nodes, t in Periods) singletask: sum(<s,i,c> in E) x<s,i,c>[t]+sum(<i,d, WMN3 Unknown OPL Problem Marker
)
Is there a fix for this problem?
#DecisionOptimization#OPLusingCPLEXOptimizer