[Cbc] Cbc segfault after many hours of CPU time

[John Forrest]

I will take a look at it. Trunk stable ??

John Forrest

On 08/03/13 20:45, acw at ascent.com wrote:
> I have a model which I have been trying to solve thus:
>
> > ./cbc -threads 4 -import trouble.mps -solve -quit
>
> As you can see, the only even slightly exotic thing I'm doing is 
> enabling multithreading, which has worked fine for me with 
> less-challenging models.
>
> Cbc works on this for several hours and then segfaults.  I tried it 
> three times.  On two occasions, it did about 5.5 M nodes before dying 
> (taking about half a CPU-day, but only three or four hours of 
> wallclock time).  On the third occasion, it managed more than 27 M 
> nodes and 2.5 CPU-days (but only overnight by the wall clock).
>
> On all occasions, the number of nodes on the tree rises rapidly to 
> about 93 K, then remains approximately constant (within a few hundred) 
> for the rest of the ill-fated run.
>
> Has anyone else had similar experiences?
>
> I have not yet tried running the model without multithreading, for 
> obvious practical reasons: it would probably take twelve hours if I 
> was lucky, and might take sixty.
>
> I'll be glad to share the MPS file (about a quarter of a meg 
> uncompressed) with anybody who wants to try this.
>
>
> _______________________________________________
> Cbc mailing list
> Cbc at list.coin-or.org
> http://list.coin-or.org/mailman/listinfo/cbc

-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/cbc/attachments/20130308/bd441701/attachment.html>