I am using CPLEX Tuning tool in python for my solve. When I run the tuning tool it gives out parameters which are best for my solve: CPXPARAM_Simplex_DGradient 5

CPXPARAM_Read_DataCheck 1

and solve time after tuning is around ~100 secs But when I run the solve with same parameters but without tuning tool solve time is around ~ 600 secs which is weird as these are same parameter tuning tool suggested and used to solve the problem. I do notice that solver log is not showing presolve logs in normal solve though its there in tuning solve. I have tried specifying presolve parameter but of no help. Any suggestion why there could be a discrepancies in both solves?

I am solving lexicographic LP problem which is having 4 levels and CPLEX tuning run on each level and provide the optimal parameters and solution

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Kartik-
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Hello Kartik,

       It's difficult to answer you with just this description. Could you send me your model?

Best rgards,

Hi Thierry,

Are you looking for solve log?

Hello Kartik,

            I'm looking for the lp or sav file. You can use the following functions to export your model:

                ·        export_as_lp(path=None, basename=None, hide_user_names=False)

                ·        dump_as_lp(path=None, basename=None)

                ·        export_as_sav(path=None, basename=None)

                ·        dump_as_sav(path=None, basename=None)

Regards,

Hi Thierry,

Unfortunately I cannot provide the lp file as its a production model