<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=Windows-1252">
</head>
<body bgcolor="#FFFFFF" text="#000000">
<style type="text/css" style="display:none;"><!-- P {margin-top:0;margin-bottom:0;} --></style>
<div id="divtagdefaultwrapper" style="font-size:10pt;color:#000000;background-color:#FFFFFF;font-family:Mangal,Sans-Serif;">
<p>Hi, </p>
<p><br>
</p>
<p><span>Could you explain more <span>about the "using 2 process in one core" and how to find out/address it? I am not very familiar with the technical aspect of supercomputing. I thought one core in supercomputing means one CPU, but did you mean that each
CPU is further made up of multiple "little-cores" themselves, or 2 cores can be on the same CPU?</span></span></p>
<p><br>
</p>
<p><span><span>I am compiling MPI using the intel compiler</span></span><span style="font-size: 10pt;">. But here is another problem. OpenMP</span><span style="font-size: 10pt;"> does not work at all on my system. The compiler finishes successfully, but then,
when I run "./real.exe", it segfaults without even creating an rsl file. I tried using "./configure -d", and updating my WRF version from 3.8 to 3.8.1, </span><span style="font-size: 10pt;">but the segfault was the same.
</span><span style="font-size: 10pt;">Do you </span><span style="font-size: 10pt;">know</span><span style="font-size: 10pt;">
</span><span style="font-size: 10pt;">what else</span><span style="font-size: 10pt;"> I might </span><span style="font-size: 10pt;">do</span><span style="font-size: 10pt;">? I attached my "configure.wrf" and "configure.wps" files. </span></p>
<p><span style="font-size: 10pt;"></span></p>
<p><br>
</p>
<p><span><span>I also tested 44 cores with no luck. Increasing the number of nodes from 4 to 6 only increased the throughput marginally. </span></span></p>
<p><span><span><br>
</span></span></p>
<p><span><span>Thank you, </span></span></p>
<p><span><span>Yaoping</span></span></p>
</div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> wrf-users-bounces@ucar.edu <wrf-users-bounces@ucar.edu> on behalf of Mike Dvorak <mike@sailtactics.com><br>
<b>Sent:</b> Thursday, September 1, 2016 5:05:28 PM<br>
<b>To:</b> wrf-users@ucar.edu<br>
<b>Subject:</b> Re: [Wrf-users] What is a reasonable speed for WRF / how to increase it?</font>
<div> </div>
</div>
<div>Hi Yaoping,<br>
<br>
What parallelization option did you compile WRF with (e.g. MPI only)? Also, I've found the Intel compilers to be 3 times faster than the GNU compilers on some WRF configurations (unfortunately). What compiler did you use?<br>
<br>
You may also want to experiment using less than the number of total cores on the machine. For example, you could try using 44 cores instead of 48. I think WRF EMS is set to do this by default. I've verified on some of my multi-core machines that this does indeed
reduce the runtime.<br>
<br>
Cheers,<br>
Mike<br>
<br>
<br>
<div class="moz-cite-prefix">On 09/01/2016 03:15 PM, Carlos Ross wrote:<br>
</div>
<blockquote cite="mid:CAMCa-Quf8n9EDb7ZpxtRU_RD9ABquyrdpTquW0sD8LfB=n-_ng@mail.gmail.com" type="cite">
<div dir="ltr">I think it should be faster, <span style="color:rgb(0,0,0);font-family:mangal,sans-serif;font-size:13.3333px">Xeon x5650 CPUs are 6 cores and 12 threads, so you maybe using 2 process in one core and that is slowing it down.</span></div>
<div class="gmail_extra"><br>
<div class="gmail_quote">2016-08-31 18:36 GMT-03:00 Wang, Yaoping <span dir="ltr">
<<a moz-do-not-send="true" href="mailto:wang.3866@buckeyemail.osu.edu" target="_blank">wang.3866@buckeyemail.osu.edu</a>></span>:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">
<div dir="ltr">
<div style="font-size:10pt;color:#000000;background-color:#ffffff;font-family:Mangal,Sans-Serif">
<p>Hi All, </p>
<p><br>
</p>
<p>I am running WRF on a ~6km resolution, <span style="font-size:10pt">91 x 121 domain in the eastern United States. I am using an adaptive time step which makes it mostly 72 sec increments. </span><span style="font-size:10pt">There are 34 vertical levels. I
use 4 x 12 cores on a Intel Xeon x5650 CPUs machine. </span><span style="font-size:10pt">The throughput is about 1.2 hour wall time per 24 hours model time. </span></p>
<p><span style="font-size:10pt"></span></p>
<p><span style="font-size:10pt"><br>
</span></p>
<p><span style="font-size:10pt">Is this a reasonable speed? I found some information here (<a moz-do-not-send="true" href="http://www.ecmwf.int/sites/default/files/elibrary/2014/13662-performance-analysis-operational-implementaion-wrf.pdf" target="_blank">http://www.ecmwf.int/sites/<wbr>default/files/elibrary/2014/<wbr>13662-performance-analysis-<wbr>operational-implementaion-wrf.<wbr>pdf</a>)
and after considering the domain difference, my run still seems a touch slow. And i</span><span style="font-size:10pt">s there anyway I could figure how to make the model run faster?</span></p>
<p><span style="font-size:10pt"><br>
</span></p>
<p><span style="font-size:10pt">Thank you, </span></p>
<span class="HOEnZb"><font color="#888888">
<p><span style="font-size:10pt">Yaoping Wang</span></p>
</font></span></div>
</div>
<br>
______________________________<wbr>_________________<br>
Wrf-users mailing list<br>
<a moz-do-not-send="true" href="mailto:Wrf-users@ucar.edu">Wrf-users@ucar.edu</a><br>
<a moz-do-not-send="true" href="http://mailman.ucar.edu/mailman/listinfo/wrf-users" rel="noreferrer" target="_blank">http://mailman.ucar.edu/<wbr>mailman/listinfo/wrf-users</a><br>
<br>
</blockquote>
</div>
<br>
</div>
<br>
<fieldset class="mimeAttachmentHeader"></fieldset> <br>
<pre wrap="">_______________________________________________
Wrf-users mailing list
<a class="moz-txt-link-abbreviated" href="mailto:Wrf-users@ucar.edu">Wrf-users@ucar.edu</a>
<a class="moz-txt-link-freetext" href="http://mailman.ucar.edu/mailman/listinfo/wrf-users">http://mailman.ucar.edu/mailman/listinfo/wrf-users</a>
</pre>
</blockquote>
<br>
<div class="moz-signature">-- <br>
<table border="0" cellpadding="2" cellspacing="2" height="126" width="15%">
<tbody>
<tr>
<td valign="center"><img alt="Sail Tactics logo" height="118" width="90" src="cid:part5.FD4A0143.10B55550@sailtactics.com"><br>
</td>
<td valign="top">Mike Dvorak, PhD<br>
Founder<br>
Sail Tactics, LLC<br>
Corpus Christi, TX<br>
+1 650-454-5243<br>
<a href="http://sailtactics.com">http://sailtactics.com</a><br>
</td>
</tr>
</tbody>
</table>
</div>
</div>
</body>
</html>