[Wrf-users] Wrf-users Digest, Vol 145, Issue 3

Fri Sep 2 18:30:50 MDT 2016

Yapping,

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.

Openmpi is not a requirement and you can use any open source api lis MPICH2
etc.

On Sat, Sep 3, 2016 at 4:08 AM, <wrf-users-request at ucar.edu> wrote:

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> Today's Topics:
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>    1. Re: What is a reasonable speed for WRF / how to increase it?
>       (Wang, Yaoping)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Fri, 2 Sep 2016 22:33:30 +0000
> From: "Wang, Yaoping" <wang.3866 at buckeyemail.osu.edu>
> Subject: Re: [Wrf-users] What is a reasonable speed for WRF / how to
>         increase it?
> To: Mike Dvorak <mike at sailtactics.com>, "wrf-users at ucar.edu"
>         <wrf-users at ucar.edu>, "cf.ross at gmail.com" <cf.ross at gmail.com>
> Message-ID:
>         <CY4PR01MB2822D7E68D45A748E49217D9B2E50 at CY4PR01MB2822.prod.
> exchangelabs.com>
>
> Content-Type: text/plain; charset="windows-1252"
>
> 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
>
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> --
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