Decision Optimization

Decision Optimization

Delivers prescriptive analytics capabilities and decision intelligence to improve decision-making.


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  • 1.  Thread-problem with CPLEX 12.7.1

    Posted 12/08/17 06:34 AM

    Originally posted by: trebron


    Hi,

    we encountered a strange problem with CPLEX 12.7.1.
    Running CPLEX with 2 threads it manages to solve the MIP to optimality within a few minutes.
    Running CPLEX with just 1 thread with a time-limit of two hours it got stuck in preprocessing and does not find any solution (neither primal nor dual).

    Are there any known issues related to that problem?

    Are there any work-arounds for 1 thread?

    Both runs can be solved  with CPLEX 12.6.2.

    Please find the log-files enclosed.

    Cheers
        Norbert


    #CPLEXOptimizers
    #DecisionOptimization


  • 2.  Re: Like Thread-problem with CPLEX 12.7.1

    Posted 12/08/17 06:43 AM

    Hi Norbert,

    no known issues come to mind that could be related to this. Comparing the logs it seems as if in the single-threaded run CPLEX may be stuck in probing. Can you try to disable probing in case you have only one thread? Can you share the model (maybe by email to daniel(dot)junglas(at)de(dot)ibm(dot)com) so that we can investigate further?


    #CPLEXOptimizers
    #DecisionOptimization


  • 3.  Re: Like Thread-problem with CPLEX 12.7.1

    Posted 12/08/17 06:49 AM

    Originally posted by: trebron


    Hi Daniel,

    I tried to switch off probing with no success.

    I'll mail you the sav-file.

    Cheers

       Norbert


    #CPLEXOptimizers
    #DecisionOptimization


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