<html dir="ltr">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
<style>
<!--
@font-face
{font-family:"Cambria Math"}
@font-face
{font-family:Calibri}
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0cm;
margin-bottom:.0001pt;
font-size:11.0pt;
font-family:"Calibri",sans-serif}
a:link, span.MsoHyperlink
{color:#0563C1;
text-decoration:underline}
a:visited, span.MsoHyperlinkFollowed
{color:#954F72;
text-decoration:underline}
span.E-MailFormatvorlage17
{font-family:"Calibri",sans-serif;
color:windowtext}
@page WordSection1
{margin:70.85pt 70.85pt 2.0cm 70.85pt}
-->
</style><style type="text/css" id="owaParaStyle"></style>
</head>
<body fpstyle="1" ocsi="0" vlink="#954F72" link="#0563C1" lang="DE">
<div style="direction: ltr;font-family: Tahoma;color: #000000;font-size: 10pt;">
<div>Are you sure that CBC is already branching when look for the CPU utilization?</div>
<div>Processing of the root node i.e. solving the root relaxation is single threaded and can take quite some time depending on the model.</div>
<div><br>
</div>
<div><br>
</div>
<div style="font-family: Times New Roman; color: #000000; font-size: 16px">
<hr tabindex="-1">
<div id="divRpF313588" style="direction: ltr;"><font size="2" face="Tahoma" color="#000000"><b>Von:</b> Cbc [cbc-bounces@coin-or.org]" im Auftrag von ""Büsing, Henrik" [h.buesing@fz-juelich.de]<br>
<b>Gesendet:</b> Donnerstag, 19. September 2019 11:21<br>
<b>An:</b> cbc@list.coin-or.org<br>
<b>Betreff:</b> [Cbc] Parllel computations with CBC<br>
</font><br>
</div>
<div></div>
<div>
<div class="WordSection1">
<p class="MsoNormal">Dear all, </p>
<p class="MsoNormal"> </p>
<p class="MsoNormal"><span lang="EN-US">I am trying to run CBC in parallel. I did a
</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">../coinbrew fetch Cbc</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">../coinbrew build Cbc --enable-cbc-parallel --prefix=/work/user/METIS/Cbc/build/build_parallel/ --test</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">and then run</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">cbc -threads 16 -import model.mps –solve</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Cbc responds with </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">“threads was changed from 0 to 16”</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">but I do not see any CPU utilization on more than one core.
</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US">Any ideas on how I could check, I did everything right?
<br>
<br>
Thank you for your help!<br>
Henrik Büsing</span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">-- </span>
</p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">Dipl.-Math. Henrik Büsing</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">Jülich Supercomputing Centre</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Institute for Advanced Simulation</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New""> </span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Forschungszentrum Jülich</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Wilhelm-Johnen-Straße</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">52425 Jülich, Germany</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US"> </span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">Phone: +49-2461-61-9884</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">Fax: +49-2461-61-6656</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">E-Mail: H.Buesing@fz-juelich.de</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"" lang="EN-US">WWW: http://www.fz-juelich.de/ias/jsc</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">-------------------------------------------------------------------------------------</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">-------------------------------------------------------------------------------------</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Forschungszentrum Juelich GmbH</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">52425 Juelich</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Sitz der Gesellschaft: Juelich</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Eingetragen im Handelsregister des Amtsgerichts Dueren Nr. HR B 3498</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Vorsitzender des Aufsichtsrats: MinDir Volker Rieke</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Geschaeftsfuehrung: Prof. Dr.-Ing. Wolfgang Marquardt (Vorsitzender),</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Karsten Beneke (stellv. Vorsitzender), Prof. Dr.-Ing. Harald Bolt,</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">Prof. Dr. Sebastian M. Schmidt</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">-------------------------------------------------------------------------------------</span></p>
<p class="MsoNormal"><span style="font-family:"Courier New"">-------------------------------------------------------------------------------------</span></p>
<p class="MsoNormal"> </p>
</div>
</div>
</div>
</div>
</body>
</html>