[Scip] SCIP 3.1 is slower than 3.0?

[Alessia Violin]

Hello,

I just passed to the new version of SCIP and tried to make a couple of 
tests, the new version seems to be significantly slower compared to the 
3.0.1.

I am using Cplex as the lp solver, and I had to compile with the tags 
ZIMP=false READLINE=false ZLIB=false GMP=false (exactly as the previous 
version, except for GMP).

I have a Branch-and-Price code, with quite a few more features (pricer, 
branching rule, heuristics, cuts). To make my code working I just needed 
to change the functions SCIP_DECL_PRICERREDCOST() and SCIPaddCut() 
adding the new parameters. All the rest is exactly the same. The number 
of nodes and columns generated is much bigger, and the dual bound is 
converging very slowly. The time goes from less than a second to some 
few hundred seconds.

Do you have any insight of this behaviour? or anything in particular I 
should check that is behaving differently in the new version?

Thanks in advance!

best,

Alessia


-- 
Alessia Violin
Service Graphes et Optimisation Mathématique (G.O.M.)
Université Libre de Bruxelles
C.P. 210/01
Boulevard du Triomphe
B-1050 BRUXELLES
Tel: 02 650 58 80 - Fax: 02 650 59 70
Email: aviolin at ulb.ac.be
Webpage: http://homepages.ulb.ac.be/~aviolin/

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