Decision Optimization

Decision Optimization

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threads parameter and actual number of CPUs

  • 1.  threads parameter and actual number of CPUs

    Posted Tue July 30, 2013 03:58 PM

    Originally posted by: NSopt


    Hi.

    I read the CPLEX manual and learned that the number of threads is the actually available number of CPUs.

    We set thread parameter to 0 (i.e., default) and observe that it use up to 24 threads for Parallel mode.

    Does this mean that we actually use 24 thread or CPUs over the run? If so, how this can happen if we only have fewer number of CPUs? 

    Thank you.

    Best,

    NS

     


    #CPLEXOptimizers
    #DecisionOptimization


  • 2.  Re: threads parameter and actual number of CPUs

    Posted Wed July 31, 2013 01:35 AM

    If the thread parameter is set to 0 then CPLEX queries the number of cores available from the operating system. It seems like your OS reports 24 here.

    What machine/OS do you run? How many CPUs/cores does that machine have? Is hyperthreading or something similar enabled?


    #CPLEXOptimizers
    #DecisionOptimization


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