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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).<div><br></div><div>Kind regards<br><br><div><div id="SkyDrivePlaceholder"></div><hr id="stopSpelling">To: ted@lehigh.edu<br>From: acw@ascent.com<br>Date: Thu, 26 Apr 2012 09:20:40 -0400<br>CC: cbc@list.coin-or.org<br>Subject: Re: [Cbc] Cbc speedup over the last two years?<br><br><font size="2" face="sans-serif">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.</font>
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<td><font size="1" color="#5f5f5f" face="sans-serif">From:</font>
</td><td><font size="1" face="sans-serif">Ted Ralphs <ted@Lehigh.EDU></font>
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<td><font size="1" color="#5f5f5f" face="sans-serif">To:</font>
</td><td><font size="1" face="sans-serif">acw@ascent.com</font>
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<td valign="top"><font size="1" color="#5f5f5f" face="sans-serif">Cc:</font>
</td><td><font size="1" face="sans-serif">"cbc@list.coin-or.org" <cbc@list.coin-or.org></font>
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<td><font size="1" color="#5f5f5f" face="sans-serif">Date:</font>
</td><td><font size="1" face="sans-serif">04/25/2012 10:18 PM</font>
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<td><font size="1" color="#5f5f5f" face="sans-serif">Subject:</font>
</td><td><font size="1" face="sans-serif">Re: [Cbc] Cbc speedup over the last
two years?</font></td></tr></tbody></table>
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<br><font size="3">What specific version of Cbc were you using previously?</font>
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<br><font size="3">Ted<br>
</font>
<br><font size="3">On Wed, Apr 25, 2012 at 2:38 PM, <</font><a href="mailto:acw@ascent.com"><font size="3" color="blue"><u>acw@ascent.com</u></font></a><font size="3">>
wrote:</font>
<br><font size="3" face="sans-serif">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.</font><font size="3"> <br>
</font><font size="3" face="sans-serif"><br>
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.</font><font size="3">
<br>
</font><font size="3" face="sans-serif"><br>
Have other COIN/Cbc users and developers experienced such a marked improvement?
Should we be ecstatic ... or suspicious?</font><font size="3"><br>
_______________________________________________<br>
Cbc mailing list</font><font size="3" color="blue"><u><br>
</u></font><a href="mailto:Cbc@list.coin-or.org"><font size="3" color="blue"><u>Cbc@list.coin-or.org</u></font></a><font size="3" color="blue"><u><br>
</u></font><a href="http://list.coin-or.org/mailman/listinfo/cbc" target="_blank"><font size="3" color="blue"><u>http://list.coin-or.org/mailman/listinfo/cbc</u></font></a><font size="3"><br>
</font>
<br><font size="3"><br>
</font>
<br>
<br><font size="3">-- <br>
Dr. Ted Ralphs<br>
Associate Professor, Lehigh University<br>
(610) 628-1280<br>
ted 'at' lehigh 'dot' edu</font><font size="3" color="blue"><u><br>
</u></font><a href="http://coral.ie.lehigh.edu/~ted" target="_blank"><font size="3" color="blue"><u>coral.ie.lehigh.edu/~ted</u></font></a><font size="3"><br>
</font>
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