[Cbc] Need advices for properly using CBC

[John Forrest]

Karl,

After a quick look at the three models, it looks to me as if you want to 
make preprocessing more lightweight.  Also for the two models with zero 
objective function, the feasibility pump heuristic takes time and does 
not help (I don't know whether that is true for other zero objective 
models).

I attach log files using stable/2.8 - 4.lp 12.5 seconds, 21.lp 4.4 and 
50.lp 1.96.  Given the sizes the times look reasonable.

I presume the 300 cases have to be solved sequentially so 420 seconds 
looks tight - if can be done in parallel then easy.

John Forrest
On 08/05/14 13:39, Karl St-Cyr wrote:
>
> Hi,
>
> I'm trying to use CBC to solve my linear problem. After implementing a 
> version of BigM I manage to find a better solution but the time to 
> solve it is a bit too high for my needs. This is my first time using 
> CBC and I want to make sure I'm not doing something wrong or missing a 
> way to speed it up.
>
> You'll find 3 dump examples I have problems with in the link bellow 
> (take note that 1 problem can be composed of 300+ of theses dumps and 
> would need to execute all of them in more or less 7 min, some of the 
> dumps are also taking close to no time).
>
>
> https://www.dropbox.com/sh/dff6h98qxhf7svy/AAC60y10SORx3b25P7bT2bAOa
>
> Thank you for your help
> Karl
>
>
>
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