Decision Optimization

Decision Optimization

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  • 1.  Warning: MIP starts not constructed because of out-of-memory status.

    Posted Fri October 16, 2015 04:07 AM

    Originally posted by: Stoepsel


    Hello,

     

    I'm trying desperately to get my optimization running.

    After about two hours the IBM ILOG CPLEX Optimization Studio tells me it is out of memory.

    I've tried saving the node files to disk and setting the memory emphasis parameter to 1. Both adjustments make no difference.

    This is the engine log:

     

    Presolve has eliminated 212228 rows and 214787 columns...

    Aggregator has done 145301 substitutions...

    Aggregator has done 151401 substitutions...

    Aggregator has done 157501 substitutions...

    Aggregator has done 163601 substitutions...

    Aggregator has done 169701 substitutions...

    Aggregator has done 175801 substitutions...

    Aggregator has done 181901 substitutions...

    Aggregator has done 188001 substitutions...

    Aggregator has done 194101 substitutions...

    Aggregator has done 200201 substitutions...

    Aggregator has done 206301 substitutions...

    Aggregator has done 212401 substitutions...

    Aggregator has done 218501 substitutions...

    Aggregator has done 224601 substitutions...

    Aggregator has done 230701 substitutions...

    Aggregator has done 236801 substitutions...

    Aggregator has done 242901 substitutions...

    Tried aggregator 2 times.

    MIP Presolve eliminated 701301 rows and 423168 columns.

    MIP Presolve modified 34943 coefficients.

    Aggregator did 296919 substitutions.

    Reduced MIP has 1410483 rows, 1376542 columns, and 3483609 nonzeros.

    Reduced MIP has 905974 binaries, 0 generals, 0 SOSs, and 591472 indicators.

    Presolve time = 1160.39 sec. (638038.94 ticks)

    Warning: MIP starts not constructed because of out-of-memory status.

     

    Root node processing (before b&c):

      Real time             = 1168.52 sec. (638746.09 ticks)

    Parallel b&c, 4 threads:

      Real time             =    0.00 sec. (0.00 ticks)

      Sync time (average)   =    0.00 sec.

      Wait time (average)   =    0.00 sec.

                              ------------

    Total (root+branch&cut) = 1168.52 sec. (638746.09 ticks)

     

    Can anyone help me?

    I'm thankful for any advice :)

     

    Thanks

    Andy


    #CPLEXOptimizers
    #DecisionOptimization


  • 2.  Re: Warning: MIP starts not constructed because of out-of-memory status.

    Posted Fri October 16, 2015 08:50 AM

    You are running out of memory pretty early in the solution process. Any chance you can reduce the size of your model? Have you tried setting CPX_PARAM_THREADS to 1 and enable CPX_PARAM_MEMORYEMPHASIS? These settings may reduce memory consumption.


    #CPLEXOptimizers
    #DecisionOptimization


  • 3.  Re: Warning: MIP starts not constructed because of out-of-memory status.

    Posted Sun November 19, 2017 11:58 PM

    Originally posted by: Evandro Ferreira


    I am using the cplex 12.7 student version.
    I would like to know if 64-bit version is available for students because I saw in a publication that there is a difference in memory and my windowns are 64-bit (http://www-01.ibm.com/support/docview.wss?uid = swg21399920).


    #CPLEXOptimizers
    #DecisionOptimization


  • 4.  Re: Warning: MIP starts not constructed because of out-of-memory status.



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