[Wrf-users] What is a reasonable speed for WRF / how to increase it?

[Wang, Yaoping]

Hi,


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?


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.


I also tested 44 cores with no luck. Increasing the number of nodes from 4 to 6 only increased the throughput marginally.


Thank you,

Yaoping

________________________________
From: wrf-users-bounces at ucar.edu <wrf-users-bounces at ucar.edu> on behalf of Mike Dvorak <mike at sailtactics.com>
Sent: Thursday, September 1, 2016 5:05:28 PM
To: wrf-users at ucar.edu
Subject: Re: [Wrf-users] What is a reasonable speed for WRF / how to increase it?

Hi Yaoping,

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?

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.

Cheers,
Mike


On 09/01/2016 03:15 PM, Carlos Ross wrote:
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.

2016-08-31 18:36 GMT-03:00 Wang, Yaoping <wang.3866 at buckeyemail.osu.edu<mailto:wang.3866 at buckeyemail.osu.edu>>:

Hi All,


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.


Is this a reasonable speed? I found some information here (http://www.ecmwf.int/sites/default/files/elibrary/2014/13662-performance-analysis-operational-implementaion-wrf.pdf) 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?


Thank you,

Yaoping Wang

_______________________________________________
Wrf-users mailing list
Wrf-users at ucar.edu<mailto:Wrf-users at ucar.edu>
http://mailman.ucar.edu/mailman/listinfo/wrf-users





_______________________________________________
Wrf-users mailing list
Wrf-users at ucar.edu<mailto:Wrf-users at ucar.edu>
http://mailman.ucar.edu/mailman/listinfo/wrf-users


--
[Sail Tactics logo]
        Mike Dvorak, PhD
Founder
Sail Tactics, LLC
Corpus Christi, TX
+1 650-454-5243
http://sailtactics.com

-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ucar.edu/pipermail/wrf-users/attachments/20160902/b084de44/attachment-0001.html 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: logo.png
Type: image/png
Size: 5891 bytes
Desc: logo.png
Url : http://mailman.ucar.edu/pipermail/wrf-users/attachments/20160902/b084de44/attachment-0001.png 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: configure.wps
Type: application/vnd.ms-works
Size: 3328 bytes
Desc: configure.wps
Url : http://mailman.ucar.edu/pipermail/wrf-users/attachments/20160902/b084de44/attachment-0001.bin 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: configure.wrf
Type: application/octet-stream
Size: 26315 bytes
Desc: configure.wrf
Url : http://mailman.ucar.edu/pipermail/wrf-users/attachments/20160902/b084de44/attachment-0001.obj