<div dir="ltr">Yapping,<div><br></div><div>When you already compiled using an MPI you should not simply use ./real.exe you should also indicate how many processors you are using and the command should be "mpirun -np 12 ./real.exe". I do not know why you are using without indicating the number of processors you like to use.</div><div><br></div><div>Openmpi is not a requirement and you can use any open source api lis MPICH2 etc.</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sat, Sep 3, 2016 at 4:08 AM, <span dir="ltr"><<a href="mailto:wrf-users-request@ucar.edu" target="_blank">wrf-users-request@ucar.edu</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Send Wrf-users mailing list submissions to<br>
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Today's Topics:<br>
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1. Re: What is a reasonable speed for WRF / how to increase it?<br>
(Wang, Yaoping)<br>
<br>
<br>
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<br>
Message: 1<br>
Date: Fri, 2 Sep 2016 22:33:30 +0000<br>
From: "Wang, Yaoping" <<a href="mailto:wang.3866@buckeyemail.osu.edu">wang.3866@buckeyemail.osu.edu</a><wbr>><br>
Subject: Re: [Wrf-users] What is a reasonable speed for WRF / how to<br>
increase it?<br>
To: Mike Dvorak <<a href="mailto:mike@sailtactics.com">mike@sailtactics.com</a>>, "<a href="mailto:wrf-users@ucar.edu">wrf-users@ucar.edu</a>"<br>
<<a href="mailto:wrf-users@ucar.edu">wrf-users@ucar.edu</a>>, "<a href="mailto:cf.ross@gmail.com">cf.ross@gmail.com</a>" <<a href="mailto:cf.ross@gmail.com">cf.ross@gmail.com</a>><br>
Message-ID:<br>
<<a href="mailto:CY4PR01MB2822D7E68D45A748E49217D9B2E50@CY4PR01MB2822.prod.exchangelabs.com">CY4PR01MB2822D7E68D45A748E492<wbr>17D9B2E50@CY4PR01MB2822.prod.<wbr>exchangelabs.com</a>><br>
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Hi,<br>
<br>
<br>
Could you explain more 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?<br>
<br>
<br>
I am compiling MPI using the intel compiler. But here is another problem. OpenMP 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, but the segfault was the same. Do you know what else I might do? I attached my "configure.wrf" and "configure.wps" files.<br>
<br>
<br>
I also tested 44 cores with no luck. Increasing the number of nodes from 4 to 6 only increased the throughput marginally.<br>
<br>
<br>
Thank you,<br>
<br>
Yaoping<br>
<br>
______________________________<wbr>__<br>
From: <a href="mailto:wrf-users-bounces@ucar.edu">wrf-users-bounces@ucar.edu</a> <<a href="mailto:wrf-users-bounces@ucar.edu">wrf-users-bounces@ucar.edu</a>> on behalf of Mike Dvorak <<a href="mailto:mike@sailtactics.com">mike@sailtactics.com</a>><br>
Sent: Thursday, September 1, 2016 5:05:28 PM<br>
To: <a href="mailto:wrf-users@ucar.edu">wrf-users@ucar.edu</a><br>
Subject: Re: [Wrf-users] What is a reasonable speed for WRF / how to increase it?<br>
<br>
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>
On 09/01/2016 03:15 PM, Carlos Ross wrote:<br>
I think it should be faster, Xeon x5650 CPUs are 6 cores and 12 threads, so you maybe using 2 process in one core and that is slowing it down.<br>
<br>
2016-08-31 18:36 GMT-03:00 Wang, Yaoping <<a href="mailto:wang.3866@buckeyemail.osu.edu">wang.3866@buckeyemail.osu.edu</a><wbr><mailto:<a href="mailto:wang.3866@buckeyemail.osu.edu">wang.3866@buckeyemail.<wbr>osu.edu</a>>>:<br>
<br>
Hi All,<br>
<br>
<br>
I am running WRF on a ~6km resolution, 91 x 121 domain in the eastern United States. I am using an adaptive time step which makes it mostly 72 sec increments. There are 34 vertical levels. I use 4 x 12 cores on a Intel Xeon x5650 CPUs machine. The throughput is about 1.2 hour wall time per 24 hours model time.<br>
<br>
<br>
Is this a reasonable speed? I found some information here (<a href="http://www.ecmwf.int/sites/default/files/elibrary/2014/13662-performance-analysis-operational-implementaion-wrf.pdf" rel="noreferrer" 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 is there anyway I could figure how to make the model run faster?<br>
<br>
<br>
Thank you,<br>
<br>
Yaoping Wang<br>
<br>
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