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<p class="MsoNormal">Hi everyone,<o:p></o:p></p>
<p class="MsoNormal">in my project I currently use GLPK as the underlying solver, but for various reasons I’m evaluating possible alternatives, so I’ve just begun studying Symphony 5.4.7, among other packages.<o:p></o:p></p>
<p class="MsoNormal">I was testing its performance in some known instances of mine and in one it crashes almost instantly after beginning pre-processing.<o:p></o:p></p>
<p class="MsoNormal">The same model is correctly solved to optimality by both GLPK 4.47 and CBC 2.7.8, so I was thinking maybe there is a bug somewhere and someone in the mailing list can find it.<o:p></o:p></p>
<p class="MsoNormal">Symphony was passed the model in CPLEX format, but I am attaching the GMPL format instead, since the .LP file is 36 mb big! I converted it using GLPK and its “--check --wlp <filename>” option.<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">NOTE:<o:p></o:p></p>
<p class="MsoNormal">I am using the command-line interface; maybe the APIs don’t show the same behaviour, but for now this is way easier, since I don’t know C.<o:p></o:p></p>
<p class="MsoNormal">I did not set any advanced parameter, just loaded the model and ran.<o:p></o:p></p>
<p class="MsoNormal">My environment is Win 7, 64-bit, 8 GB RAM. I downloaded the source code from
<a href="http://www.coin-or.org/download/source/SYMPHONY">http://www.coin-or.org/download/source/SYMPHONY</a>, built the VS solution with
<u>Visual Studio 2012 Ultimate</u> (it did not say it was supported but I could upgrade and build it without problem), and used the generated MSVisualStudio\v10\Win32\symphony.exe file.<i><o:p></o:p></i></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Thank you,<o:p></o:p></p>
<p class="MsoNormal">Pietro<o:p></o:p></p>
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