[Symphony] Symphony Size limitation?

[Menal Guzelsoy]

Stuart,

I am not sure, but it might be related to the memory limit of your machine.
Depending on the density of the matrix, it might be consuming all available
memory and hence, gets killed. If possible, can you send me a sample file?
Also, can you try the stable/5.2 version? It might help.

Menal Guzelsoy
Ph.D. Candidate
Industrial and Systems Engineering Dept.
Lehigh University
1610 4620455

On Fri, Mar 6, 2009 at 12:22 PM, Rundlett, Stuart (Stuart) <
srundlett1 at ofsoptics.com> wrote:

>  Hi,
>
> I have been using Symphony (5.1.10) successfully, with a GMPL model (GLPK
> 4.31) on Sun Solaris 5.8. But when I scale up the size of the problem (more
> integer variables, more constraints) beyond a certain level, Synphony
> terminates before getting very far, with a core dump (no error message). Are
> there any inherent size limitations that I need to be aware of? I did try
> increasing the max_size parameter, but this did not seem to have any effect.
>
> The problem may be associated with cut generation, but I'm not sure. The
> last message before the core dump is "2 Gomory cuts added". When running the
> same model, smaller size, it generates other types of cuts (flow cover,
> 2-MIR), but no Gomory cuts. So maybe the larger size problem requires the
> Gomory cuts, and there's a problem with that routine. Or maybe the problem
> is the problem size itself. There are about 8000 binary variables in the
> model I'm running, to give an idea of the size.
>
> Any ideas on how to troubleshoot or work around this issue would be
> appreciated.
>
> Thanks.
>
> Stu Rundlett
>
> _______________________________________________
> Symphony mailing list
> Symphony at list.coin-or.org
> http://list.coin-or.org/mailman/listinfo/symphony
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/symphony/attachments/20090306/a7c383d2/attachment.html>