[Cbc] CBC significant different running times with the same instance and executable

[Rita Portugal]

Hi,

My name is Rita Portugal

I've been working with CBC "inside" C++ language in Visual Studio framework.

I'm having some strange behavior that I'm hopping you could help me on 
understanding it.

I read the input data, create a linear integer model than call 
branchAndBound.

I started by testing a very small example to understand running time 
behavior but, while running the same instance and the same solver 
configuration several different times (in the same machine) I'm keep 
having different time results for getting the same optimal solution 
(between 5 minutes to 25).

When reading the user guide I understand that CBC has random components 
during is running process that can be desactivate by the 
setRandomSeed(7777) comand. But even doing that the behavior is still 
the same.

Can you please advise me about any other possible responsable components 
for having such a different behavior between runnings?

Thank you in advance

-- 
SISCOG - Sistemas Cognitivos, SA

Rita Portugal
Software Engineer

*SISCOG - Sistemas Cognitivos, SA*
Campo Grande, 378 - 3º, 1700-097 Lisboa • Portugal
Tel: +351 217 529 100 • Fax: +351 217 529 101


*www.siscog.pt* <http://www.siscog.pt>

*"Optimising the resources of the world"*



DISCLAIMER
This message may contain confidential information. You should not copy 
or address this message to third parties.
If you are not the appropriate recipient we kindly ask you to delete the 
message and notify the sender.
The contents of this message and its attachments are the sole 
responsibility of the sender and under no circumstances can SISCOG - 
Sistemas Cognitivos, SA be liable for any resulting consequences.

AVISO
Esta mensagem pode conter informação considerada confidencial, não 
devendo ser copiada ou endereçada a terceiros.
Se o receptor não for o destinatário apropriado, agradecemos que destrua 
a mensagem e informe o emissor do sucedido.
O conteúdo desta mensagem bem como dos respectivos anexos é da 
responsabilidade exclusiva do emissor, não podendo a SISCOG - Sistemas 
Cognitivos, SA ser responsabilizada por eventuais consequências.
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/cbc/attachments/20200127/d7b7bc2e/attachment.html>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://list.coin-or.org/pipermail/cbc/attachments/20200127/d7b7bc2e/attachment-0001.html>