<div dir="ltr">Yeah I saw they were close, just didn't know if the wallclock was maybe checked on a different frequency or perhaps on a separate thread.<br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 22, 2018 at 8:59 PM, Matthew Galati <span dir="ltr"><<a href="mailto:matthew.galati@gmail.com" target="_blank">matthew.galati@gmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">Wall clock and cpu are pretty close here. I suspect CBC is just not checking maxtime often enough (inside some expensive operation). <div><br><div id="m_-1602836837881015AppleMailSignature">Sent from my iPhone</div><div><div class="h5"><div><br>On Jan 22, 2018, at 9:48 PM, Andrew Wald <<a href="mailto:andrewjohnwald@gmail.com" target="_blank">andrewjohnwald@gmail.com</a>> wrote:<br><br></div><blockquote type="cite"><div><div dir="ltr"><div><div>Hi Matthew,<br></div><div><br></div><div>It seems like your problem is pretty large and spent a lot of time pre-processing... <br></div><div><br></div><div>Not sure if this will help since I don't have your files to test, but this might be something to try. What about constraining by the wall clock like this when you call it up:</div><div> cbc -solve -quit -seconds 1300 -timeMode elapsed<br></div><div><br></div>- Andrew<br></div><br></div><div class="gmail_extra"><br><div class="gmail_quote">On Mon, Jan 22, 2018 at 8:06 PM, Matthew Galati <span dir="ltr"><<a href="mailto:Matthew.Galati@sas.com" target="_blank">Matthew.Galati@sas.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
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<p class="MsoNormal">Two minor issues. This is through the C++ CBCModel API using the latest CBC.<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<ol style="margin-top:0in" start="1" type="1">
<li class="m_-1602836837881015m_-9031498779656191996MsoListParagraph" style="margin-left:0in">I set max time (1300 seconds), but CBC did not stop until after 19,900 seconds.<u></u><u></u></li><li class="m_-1602836837881015m_-9031498779656191996MsoListParagraph" style="margin-left:0in">This is a maximization problem, but the final summary states “Lower bound” for the bound. It might be cleaner to just say “bound” – to avoid confusion.<u></u><u></u></li></ol>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">command line - cbc -solve -quit -seconds 1300 (default strategy 1)<u></u><u></u></p>
<p class="MsoNormal">Continuous objective value is 1.88508e+09 - 855.75 seconds<u></u><u></u></p>
<p class="MsoNormal">Cgl0005I 998000 SOS with 13941976 members<u></u><u></u></p>
<p class="MsoNormal">Cgl0004I processed model has 999000 rows, 13941976 columns (13941976 integer (13 <wbr> <wbr> 9419<wbr>76 of which binary)) and 26887952 elements<u></u><u></u></p>
<p class="MsoNormal">Cutoff increment increased from 1e-05 to 0.9999<u></u><u></u></p>
<p class="MsoNormal">Cbc0020I Exiting on maximum time<u></u><u></u></p>
<p class="MsoNormal">Cbc0005I Partial search - best objective 1e+50 (best possible -1.885078e+09), to <wbr> <wbr> ok 0 iterations and 0 nodes (19624.31 seconds)<u></u><u></u></p>
<p class="MsoNormal">Cbc0035I Maximum depth 0, 0 variables fixed on reduced cost<u></u><u></u></p>
<p class="MsoNormal">Cuts at root node changed objective from -1.88508e+09 to -1.88508e+09<u></u><u></u></p>
<p class="MsoNormal">Probing was tried 0 times and created 0 cuts of which 0 were active after adding <wbr> <wbr> <wbr> rounds of cuts (0.000 seconds)<u></u><u></u></p>
<p class="MsoNormal">Gomory was tried 0 times and created 0 cuts of which 0 were active after adding <wbr> <wbr> <wbr> rounds of cuts (0.000 seconds)<u></u><u></u></p>
<p class="MsoNormal">Knapsack was tried 0 times and created 0 cuts of which 0 were active after addin <wbr> <wbr> g rounds of cuts (0.000 seconds)<u></u><u></u></p>
<p class="MsoNormal">Clique was tried 0 times and created 0 cuts of which 0 were active after adding <wbr> <wbr> <wbr> rounds of cuts (0.000 seconds)<u></u><u></u></p>
<p class="MsoNormal">MixedIntegerRounding2 was tried 0 times and created 0 cuts of which 0 were activ <wbr> <wbr> <wbr> e after adding rounds of cuts (0.000 seconds)<u></u><u></u></p>
<p class="MsoNormal">FlowCover was tried 0 times and created 0 cuts of which 0 were active after addi <wbr> <wbr> <wbr> ng rounds of cuts (0.000 seconds)<u></u><u></u></p>
<p class="MsoNormal">TwoMirCuts was tried 0 times and created 0 cuts of which 0 were active after add <wbr> <wbr> <wbr> ing rounds of cuts (0.000 seconds)<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Result - Stopped on time limit<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">No feasible solution found<u></u><u></u></p>
<p class="MsoNormal">Lower bound: 1885078031.000<u></u><u></u></p>
<p class="MsoNormal">Enumerated nodes: 0<u></u><u></u></p>
<p class="MsoNormal">Total iterations: 0<u></u><u></u></p>
<p class="MsoNormal">Time (CPU seconds): 19928.34<u></u><u></u></p>
<p class="MsoNormal">Time (Wallclock seconds): 19973.07<u></u><u></u></p>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal">Total time (CPU seconds): 19930.87 (Wallclock seconds): 19975.64<u></u><u></u></p>
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