Re: Debugging stochastic programs

On 23 Jan 2006 02:39:21 -0800, AN O'Nymous <a_n_onymous80@xxxxxxxxxxx>
wrote in <1138012761.297101.280680@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>:
> Hello. I have a stochastic program that crashes with a sigsev (in
> Linux) after running for about a day. The exact part of the
> optimisation process the program crashes in is variable (surprising,
> considering that all RNG calls are actually deterministic).

But are you starting with the same seeeding each time?

> Any ideas on what might be causing it, or how I can find the bug?

Turn on bounds checking, and look very carefully for mismatched
sub-program parameters (esp. if sections are compiled separately).

> I have not been able to reproduce the error with shorter optimisation
> runs.

Are you overflowing an accumulated sum (tho' that's not likely to
directly cause a sigsegv, I think)?

--
Ivan Reid, Electronic & Computer Engineering, ___ CMS Collaboration,
Brunel University. Ivan.Reid@[brunel.ac.uk|cern.ch] Room 40-1-B12, CERN
KotPT -- "for stupidity above and beyond the call of duty".
.