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<p class="MsoNormal"><span style="color:#1F497D">John,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">yes, the bug goes away. Valgrind keeps quiet, too. Except that I used „= {}“ instead of „= {0}“. I changed that in my copy of Cbc as a workaround until a fixed version is released.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">In case the real bug is hiding in the following if-else statements it may not be sufficient and someone else may trigger it again.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Tobias<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="color:windowtext;mso-fareast-language:DE">Von:</span></b><span style="color:windowtext;mso-fareast-language:DE"> John Forrest [mailto:john.forrest@fastercoin.com]
<br>
<b>Gesendet:</b> Mittwoch, 18. Mai 2016 17:54<br>
<b>An:</b> Tobias Stengel <Tobias.Stengel@locom.de><br>
<b>Betreff:</b> Re: [Cbc] defining a custom cut generator<o:p></o:p></span></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Tobias,<br>
<br>
If you set switches and accuracyFlag to 0, does the bug go away? Anyway it would obviously be more elegant to have<br>
<br>
int switches[30]={0};<br>
int accuracyFlag[30]={0};<br>
char doAtEnd[30]={0};<br>
<br>
John Forrest<br>
On 17/05/16 09:19, Tobias Stengel wrote:<span style="font-size:12.0pt;mso-fareast-language:DE"><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="color:#1F497D">Hello John,</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">I did some printf+valgrind debugging and found the following (for gcc+linux):</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="color:#1F497D">If (and only if) the custom cut generator is added, an uninitialised value is passed to the „TwoMirCuts“ CbcCutGenerator::</span><span style="font-size:9.5pt;font-family:Consolas;background:white;mso-highlight:white;mso-fareast-language:DE">setInaccuracy</span><o:p></o:p></p>
<p class="MsoListParagraph" style="text-indent:-18.0pt;mso-list:l0 level1 lfo2"><![if !supportLists]><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span><![endif]><span style="font-size:9.5pt;font-family:Consolas;mso-fareast-language:DE">This value originates from CbcSolver.cpp, line 4880. I have no idea whether just a „= {}“ is missing or if something goes wrong in the following if-else statements.</span><o:p></o:p></p>
<p class="MsoListParagraph"><span style="color:#1F497D"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D">For Visual C++, with the „</span><span style="font-size:9.5pt;font-family:Consolas;color:blue;background:white;mso-highlight:white;mso-fareast-language:DE">int</span><span style="font-size:9.5pt;font-family:Consolas;background:white;mso-highlight:white;mso-fareast-language:DE">
accuracyFlag[30] = {};</span><span style="color:#1F497D">“ the assert is still triggered with TwoMirCuts.</span><span style="font-size:9.5pt;font-family:Consolas;background:white;mso-highlight:white;mso-fareast-language:DE">switchOffIfLessThan</span><span style="font-size:9.5pt;font-family:Consolas;mso-fareast-language:DE">()
== 858993460. If the the switches array in CbcSolver, line 4879 is also initialised with „ = {}“, everything works fine.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;mso-fareast-language:DE"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;mso-fareast-language:DE">As the arrays live on the stack, this could explain why
<span style="background:white;mso-highlight:white">switchOffIfLessThan</span>() is reproducible 858993460 and why the behaviour depends on the compiler/compilerflags.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;mso-fareast-language:DE"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;mso-fareast-language:DE">Nevertheless looks very strange to me that adding a custom cut generator changes the values passed to the TwoMirCuts generator.</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;mso-fareast-language:DE"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;mso-fareast-language:DE">Tobias</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#1F497D"> </span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="color:windowtext;mso-fareast-language:DE">Von:</span></b><span style="color:windowtext;mso-fareast-language:DE"> Cbc [<a href="mailto:cbc-bounces@coin-or.org">mailto:cbc-bounces@coin-or.org</a>]
<b>Im Auftrag von </b>John Forrest<br>
<b>Gesendet:</b> Dienstag, 10. Mai 2016 14:57<br>
<b>An:</b> <a href="mailto:cbc@list.coin-or.org">cbc@list.coin-or.org</a><br>
<b>Betreff:</b> Re: [Cbc] defining a custom cut generator</span><o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">Tobias,<br>
<br>
Odd. By default the variable switchOffIfLessThan_ in a CbcCutGenerator is zero. This means that you would not get to 9401 as it would fail test -<br>
<br>
if (generator_[i]->switchOffIfLessThan() < 0) {<br>
<br>
at line 9398.<br>
<br>
What value is switchOffIfLessThan_ when assert happens? You do not reference CbcCutGenerator so how is the generator being added to CbcModel?<br>
<br>
John Forrest<br>
<br>
On 10/05/16 13:02, Tobias Stengel wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi all,<o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal">I am trying to define my on cut generator. My test problem is noswot problem from miplib 3. When I add the following generator (reduced from my generator) to my model, the assert „<span style="font-size:9.5pt;font-family:Consolas;color:#6F008A;background:white;mso-highlight:white">assert</span><span style="font-size:9.5pt;font-family:Consolas;background:white;mso-highlight:white">
(iSwitch >= 0 && iSwitch < 2);</span><span style="font-size:9.5pt;font-family:Consolas">“ in CbcModel.cpp, line 9401 fails. If compiled in release mode (turning asserts off), the correct solution is found.</span><o:p></o:p></p>
<p class="MsoNormal"> <o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;background:white;mso-highlight:white">I am using Cbc 2.9.8 and Microsoft visual C++ 2013.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;background:white;mso-highlight:white"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;background:white;mso-highlight:white"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;background:white;mso-highlight:white">Thanks</span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.5pt;font-family:Consolas;color:#2B91AF;background:white;mso-highlight:white">Tobias</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:12.0pt"><br>
<br>
<br>
<br>
</span><o:p></o:p></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Cbc mailing list<o:p></o:p></pre>
<pre><a href="mailto:Cbc@list.coin-or.org">Cbc@list.coin-or.org</a><o:p></o:p></pre>
<pre><a href="http://list.coin-or.org/mailman/listinfo/cbc">http://list.coin-or.org/mailman/listinfo/cbc</a><o:p></o:p></pre>
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<p class="MsoNormal"><span style="font-size:12.0pt"> </span><o:p></o:p></p>
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<br>
<br>
<o:p></o:p></span></p>
<pre>_______________________________________________<o:p></o:p></pre>
<pre>Cbc mailing list<o:p></o:p></pre>
<pre><a href="mailto:Cbc@list.coin-or.org">Cbc@list.coin-or.org</a><o:p></o:p></pre>
<pre><a href="http://list.coin-or.org/mailman/listinfo/cbc">http://list.coin-or.org/mailman/listinfo/cbc</a><o:p></o:p></pre>
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<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif;mso-fareast-language:DE"><o:p> </o:p></span></p>
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