Decision Optimization

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Strange (different) solution finding when using solution pool

  • 1.  Strange (different) solution finding when using solution pool

    Posted 07/23/10 07:43 AM

    Originally posted by: robi13


    Dears,

    I experienced the following odd behavior of OPL CPLEX when running a MIP problem instance:

    When running the problem (with the EPgap set to 10%), CPLEX does not find a feasible solution for hours, if I activate the solution pool leaving all other settings unchanged, CPLEX finds a solution within minutes and starts improving it. At some point with EP gap far from the set 10% it switches over to the populate solution pool routine and after some minutes stops (again EP gap far from initially set 10%).

    I have no idea why this happens. The solutions obtained are far from optimal.

    I wonder why the solver finds 1) a feasible solution very fast if I turn on the solution pool and 2) why CPLEX ignores the EP gap setting.

    Does somebody experience similar behaviors?

    Thanks
    Robert
    #DecisionOptimization
    #OPLusingCPLEXOptimizer