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<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">>>>Will BLIS use normal BB when the cutStretagy is disabled?
</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Yes.
<o:p></o:p></span></p>
<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">>>>Or the efficiency difference between cut and normal BB are so large?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Cuts is a key factor of solving IP faster. For many instances, it is very effective. Cuts will cut off part of search space.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Auto option will use cuts.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">Hope this helps,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D">--Yan<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri","sans-serif";color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif"">From:</span></b><span style="font-size:10.0pt;font-family:"Tahoma","sans-serif""> chipps-bounces@list.coin-or.org [mailto:chipps-bounces@list.coin-or.org]
<b>On Behalf Of </b>???<br>
<b>Sent:</b> Saturday, December 17, 2011 4:22 AM<br>
<b>To:</b> chipps@list.coin-or.org<br>
<b>Cc:</b> geogrid@gmail.com<br>
<b>Subject:</b> [CHiPPS] Some Problem About Using Blis<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">Dear Sir</span><span lang="ZH-CN">，</span><o:p></o:p></p>
<blockquote style="margin-top:5.0pt;margin-right:0in;margin-bottom:5.0pt">
<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">I have two questions about BLIS.</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:21.75pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">First, I have used it to solve a IP problem successfully in about 30 seconds.</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">But when I disable the cutStretagy (setted in the par file) it cannot solve the same problem using best-first or best-estimate search strategy.</span><o:p></o:p></p>
<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">It will cause the MPI to abort saying
</span><span lang="ZH-CN">“</span><span style="font-family:"Times New Roman","serif"">one task is killed and other tasks is terminated.</span><span lang="ZH-CN">”</span><o:p></o:p></p>
<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">When using the depth-first, it reached the setted nodelimate 1 million</span><o:p></o:p></p>
<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">Will BLIS use normal BB when the cutStretagy is disabled?
</span><o:p></o:p></p>
<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">Or am I wrong to only disable the cutstretagy without changing other options?</span><o:p></o:p></p>
<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">Or the efficiency difference between cut and normal BB are so large?</span><o:p></o:p></p>
<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">Why it can not solve the IP problem?</span><o:p></o:p></p>
<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">Our IP model has 75861 rows, 115173 columns and 1417123 elements(MPS file)</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:21.75pt"> <o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">Second, the Blis_heurStrategy and Blis_cutStrategy have an auto option.</span><o:p></o:p></p>
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<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif"">If auto is on when will it do or not do heuristic or cut?</span><o:p></o:p></p>
</blockquote>
<p class="MsoNormal" style="text-indent:21.75pt"><span style="font-family:"Times New Roman","serif""> </span><o:p></o:p></p>
<p class="MsoNormal">Thank you very much. <o:p></o:p></p>
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