EXCEPTION_VIOLATION_ERROR

[rsl.s...@gmail.com]

i am using cplex to solve my problem. it works in small data but if i use larger dataset this error shows: EXCEPTION_VIOLATION_ERROR

and shows me a dialogbox that says an internal error occured

this error occur when gap is 0.02%. is it relevant to engine settings???

this is the engine log:

Tried aggregator 1 time.

MIP Presolve eliminated 502266 rows and 536402 columns.

MIP Presolve modified 102630 coefficients.

Aggregator did 1043 substitutions.

Reduced MIP has 57433 rows, 57756 columns, and 536952 nonzeros.

Reduced MIP has 57756 binaries, 0 generals, 0 SOSs, and 0 indicators.

Presolve time =    3.11 sec.

Clique table members: 326282.

MIP emphasis: balance optimality and feasibility.

MIP search method: dynamic search.

Parallel mode: deterministic, using up to 4 threads.

Root relaxation solution time =   12.19 sec.

        Nodes                                         Cuts/

   Node  Left     Objective  IInf  Best Integer     Best Node    ItCnt     Gap

*     0+    0                            0.0000                  10079     --- 

      0     0  1.10638e+009  9140        0.0000  1.10638e+009    10079     --- 

      0     0  9.66648e+008 12784        0.0000   Cuts: 14563    32353     --- 

      0     0  8.90387e+008 15674        0.0000   Cuts: 14610    84345     --- 

      0     0  7.88595e+008 19273        0.0000   Cuts: 12926   153669     --- 

      0     0  7.18117e+008 21526        0.0000   Cuts: 14639   240858     --- 

      0     0  6.63355e+008 21554        0.0000   Cuts: 13336   344390     --- 

*     0+    0                      3.29341e+008  6.63355e+008   344390  101.42%

      0     0  6.20116e+008 23042  3.29341e+008   Cuts: 11256   432413   88.29%

      0     0  5.94210e+008 23574  3.29341e+008    Cuts: 9891   536374   80.42%

      0     0  5.76460e+008 19233  3.29341e+008    Cuts: 8471   622267   75.03%

      0     0  5.66112e+008 13794  3.29341e+008    Cuts: 4856   668143   71.89%

      0     0  5.59326e+008 21409  3.29341e+008    Cuts: 3060   735273   69.83%

      0     0  5.55223e+008 14064  3.29341e+008    Cuts: 2375   767468   68.59%

      0     0  5.52447e+008 14936  3.29341e+008    Cuts: 1102   793260   67.74%

*     0+    0                      5.48207e+008  5.52447e+008   793260    0.77%

      0     0  5.50857e+008 12591  5.48207e+008     Cuts: 607   809974    0.48%

*     0+    0                      5.48207e+008  5.50857e+008   809974    0.48%

      0     0  5.49937e+008 12320  5.48207e+008     Cuts: 253   820999    0.32%

      0     0  5.49372e+008 12535  5.48207e+008      Cuts: 90   827374    0.21%

      0     0  5.49022e+008 11873  5.48207e+008     Cuts: 139   834017    0.15%

      0     0  5.48863e+008 11602  5.48207e+008       Cuts: 8   836743    0.12%

      0     0  5.48795e+008 12106  5.48207e+008      Cuts: 26   838197    0.11%

      0     0  5.48762e+008 12541  5.48207e+008      Cuts: 17   838903    0.10%

*     0+    0                      5.48654e+008  5.48762e+008   838903    0.02%

[Robert Fourer]

This appears to be a crash in the CPLEX solver. So that we can better understand the problem, please provide the entire log listing, beginning with "CPLEX 12...." and running through the end of the listing including the error messages; note that some additional error messages may appear after you close the dialog box. After that we may need copies of your files, to reproduce the problem on our computers; if you can easily provide the files now, you may include them as attachments to your reply.

Bob Fourer
am...@googlegroups.com

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