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</o:shapelayout></xml><![endif]--></head><body lang=EN-US link="#0563C1" vlink="#954F72"><div class=WordSection1><p class=MsoNormal>Dear All,<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Below is a typical(?) output from CBC.<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Are there any smart ways to utilize this information in order to improve solution speed, for instance by adjusting search parameters? Or is the algorithm self-adjusting in a good (enough) way?<o:p></o:p></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>For instance, from the text <br> <i>Knapsack was tried 10 times and created 0 cuts of which 0 were active after adding rounds of cuts (0.016 seconds)<br></i>I read that CBC quickly finds out that Knapsack is not working well for the MIP at hand, and therefore quits using Knapsack.<o:p></o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'><i>Cbc0001I Search completed - best objective -1028466.29607, took 314404 iterations and 13770 nodes (68.88 seconds)<br>Cbc0032I Strong branching done 26424 times (318894 iterations), fathomed 921 nodes and fixed 3737 variables<br>Cbc0035I Maximum depth 55, 126998 variables fixed on reduced cost<br>Cuts at root node changed objective from -1.06505e+006 to -1.03849e+006<br>Probing was tried 2999 times and created 5690 cuts of which 0 were active after adding rounds of cuts (0.371 seconds)<br>Gomory was tried 2937 times and created 826 cuts of which 0 were active after adding rounds of cuts (2.090 seconds)<br>Knapsack was tried 10 times and created 0 cuts of which 0 were active after adding rounds of cuts (0.016 seconds)<br>Clique was tried 10 times and created 0 cuts of which 0 were active after adding rounds of cuts (0.000 seconds)<br>MixedIntegerRounding2 was tried 2943 times and created 2272 cuts of which 0 were active after adding rounds of cuts (2.308 seconds)<br>FlowCover was tried 2943 times and created 1781 cuts of which 0 were active after adding rounds of cuts (2.138 seconds)<br>TwoMirCuts was tried 10 times and created 14 cuts of which 0 were active after adding rounds of cuts (0.036 seconds)<br>ImplicationCuts was tried 215 times and created 12 cuts of which 0 were active after adding rounds of cuts (0.004 seconds)<o:p></o:p></i></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal>Best regards,<o:p></o:p></p><p class=MsoNormal>Bjorn<span style='font-size:12.0pt;font-family:"Times New Roman",serif;color:black'><o:p></o:p></span></p><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Times New Roman",serif;color:black'><o:p> </o:p></span></p><p class=MsoNormal><span lang=NO-BOK><o:p> </o:p></span></p></div></body></html>