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,

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

------------------------------
Kartik-
------------------------------

Hi Thierry,

Are you looking for solve log?

Hello Kartik,

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

Best rgards,

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

------------------------------
Kartik-
------------------------------

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,

Are you looking for solve log?

Hello Kartik,

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

Best rgards,

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

------------------------------
Kartik-
------------------------------