Originally posted by: Helia

Hello everyone,

I am solving multiple instances of a large problem by OPL. To save time, I have tried various settings such as:

1. Applying RINS heuristic at 20

2. Set the tolerated MIP gap to 10%

3. Ask for solution polishing at 20% gap 

4. Providing initial solution 

But it seems like only for some problems these settings work. I would like to know how I can tune the settings in order to solve a problem in an acceptable time (at most 1 day for my case). 

Also, I find it is bizarre that solving a very large problem with the setting above, the CPU usage of the computer is in average 20% ! I was expecting this percentage to be much higher. So. I m thinking maybe the settings that I select wastes a lot of time and doesn't really direct the efforts of the solver to best usage of the computer capacity? Any thoughts?

Thank you.

Best,

Helia

Hi

have you tried the tuning tool within the IDE ?

regards

Originally posted by: Helia

Thanks a lot for your advice. It worked very well!

Best,

Helia