[Cbc] Cbc speedup over the last two years?

[David Ibarra Gómez]

Yes we also build our tool around 2009, nevertheless we used GAMS so the version could be older. Futhermore, sometimes when the time for solving a MIP expired it did not return the best feasible solution. Now It works much better (2.7.5).
Kind regards

To: ted at lehigh.edu
From: acw at ascent.com
Date: Thu, 26 Apr 2012 09:20:40 -0400
CC: cbc at list.coin-or.org
Subject: Re: [Cbc] Cbc speedup over the last two years?

It's from before CbcSolver politely announced
its build date with every solve.  Circumstantial evidence indicates
a version from late 2008, so it's older than I thought when I wrote my
initial message.








From:
Ted Ralphs <ted at Lehigh.EDU>

To:
acw at ascent.com

Cc:
"cbc at list.coin-or.org" <cbc at list.coin-or.org>

Date:
04/25/2012 10:18 PM

Subject:
Re: [Cbc] Cbc speedup over the last
two years?








What specific version of Cbc were you using previously?



Ted



On Wed, Apr 25, 2012 at 2:38 PM, <acw at ascent.com>
wrote:

After procrastinating for months, we
finally got around to rebuilding our application on the most recent stable
version of the COIN/Cbc sources.  Our last update was around two years
ago. 



We were very pleasantly surprised to find a dramatic speedup in solving
our typical problem mix.  Problems that used to run out of time (with
a timeout set to 1800 CPU seconds) now complete in just a few seconds.




Have other COIN/Cbc users and developers experienced such a marked improvement?
 Should we be ecstatic ... or suspicious?

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-- 

Dr. Ted Ralphs

Associate Professor, Lehigh University

(610) 628-1280

ted 'at' lehigh 'dot' edu

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