[Symphony] Symphony Size limitation?

[Rundlett, Stuart (Stuart)]

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
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