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<p class="MsoNormal">Hi Gerald,<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">I’m using SCIP 6.0.2. I see the display frequency was hiding some information about cuts. (Text attached.)<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Marcus<o:p></o:p></p>
<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal"><b><span style="font-size:12.0pt;color:black">From: </span></b><span style="font-size:12.0pt;color:black">Gerald Gamrath <gamrath@zib.de><br>
<b>Date: </b>Monday, January 27, 2020 at 11:56 AM<br>
<b>To: </b>Marcus Daniels <marcus@snoutfarm.com>, "scip@zib.de" <scip@zib.de><br>
<b>Subject: </b>Re: [SCIP] small gaps<o:p></o:p></span></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">Dear Marcus,<br>
<br>
which SCIP version are you using?<br>
<br>
There is probably some branching and cuts going on, but SCIP does not print information for every node. But it seems indeed very slow here. If you interrupt using CTRL-C or set a time limit of say, one hour, and then print the statistics via "display statistics"
you should be able to identify where all the time is spent. Alternatively, you could also "set display frequency 1" to print a line for every node. But in the end, the statistics should be most interesting.<br>
<br>
Best,<br>
Gerald<o:p></o:p></p>
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<p class="MsoNormal">On 27.01.20 18:59, Marcus Daniels wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Hi,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">I have a set of relaxed problems that find feasibility, run for a few seconds, and then get stuck as below. There's no further branching and no further cuts, not even after an hour. Depending
on the problem the gap might be 0.01% or 0.80%. Any suggestions on how to debug this or tune it to get to a zero gap? I tried doing less frequent LP solves, but that also runs forever.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Thanks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Marcus<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New";color:black"> time | node | left |LP iter|LP it/n| mem |mdpt |frac |vars |cons |cols |rows |cuts |confs|strbr| dualbound | primalbound | gap</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New";color:black"> 97.1s| 1 | 0 | 1247 | - | 156M| 0 | 2 |5502 |3048 |5502 |3067 | 20 | 0 | 0 | 1.524548e-02 | 1.528577e-02 | 0.26%</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:8.0pt;font-family:"Courier New";color:black"> 97.1s| 1 | 2 | 1247 | - | 157M| 0 | 2 |5502 |3048 |5502 |3067 | 20 | 0 | 2 | 1.524548e-02 | 1.528577e-02 | 0.26%</span><span style="font-size:12.0pt;color:black"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><br>
<br>
<o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Scip mailing list<o:p></o:p></pre>
<pre><a href="mailto:Scip@zib.de">Scip@zib.de</a><o:p></o:p></pre>
<pre><a href="https://listserv.zib.de/mailman/listinfo/scip">https://listserv.zib.de/mailman/listinfo/scip</a><o:p></o:p></pre>
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<br>
<o:p></o:p></p>
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