[Cbc] Performance issues

[Haroldo Gambini Santos]

Could you send us the LP file so that we can play with some parameters ?
Cheers,
Haroldo

Em 09/01/2017 06:21, Bernhard Dick escreveu:
> Hi,
>
> I have a MILP with ca 2000 variables, 400 of them being binary and 1300
> constraints. Currently I solve this using lpsolve but I also tried it using
> CBC, based on the sample5.cpp with CoinBuild. However I face some
> performance issues: On my test system lpsolve needs about 120msec to solve
> the problem, CBC needs ca 3-4secs is thus 30-40 times slower. I use a
> MID-GAP of 3% set by model.setAllowablePercentageGap(3).
> Another interesting fact is that If I save the problem to an lp oder mps
> file and reload the file in CBC solving gets about 1sec faster.
> Do you have any ideas how to improve the performance here, as in different
> benchmarks that I've found cbc performs much faster than lpsolve, so I'm a
> bit surprised by the results I see.
>
>    Regards
>      Bernhard Dick
>
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-- 
==================================================
Haroldo Gambini Santos
D.Sc, Computer Science
Universidade Federal de Ouro Preto
http://www.decom.ufop.br/haroldo/