<div dir="ltr"><div><div><div><div><div>Hi,<br></div>please try again the difference is double and if they can do these persons you must try.<br><br></div>1.Prossesor 2.cores 3.chips 4.core/chip 5.copies 6.results<br>Intel Xeon E7-4807, 1.87 GHz 12 2 6 24 251<br>Intel Xeon E7-4807, 1.87 GHz 24 4 12 48 499<br><br></div>the 1st system has 2 chip and the second 4 chip both of them placed at PowerEdge R910 Dell.<br><br></div>Maybe this can help you, configuration of the first and the second system.<br></div><br><div><div><pre>test_sponsor = Dell Inc.
hw_avail = Apr-2011
sw_avail = Apr-2011
tester = Dell Inc.
hw_cpu_name = Intel Xeon E7-4807
hw_cpu_mhz = 1867
hw_disk = 1 x 500 GB 7200 RPM SAS 6Gb
hw_fpu = Integrated
hw_memory000 = 256 GB (32 x 8 GB 4Rx8 PC3-8500R-7, ECC, running
hw_memory001 = at 800 MHz)
hw_model = PowerEdge R910 (Intel Xeon E7-4807, 1.87 GHz)
hw_ncpuorder = 2,4 chips
hw_ncores = 12
hw_nchips = 2
hw_ncoresperchip = 6
hw_nthreadspercore = 2
hw_other = None
hw_pcache = 32 KB I + 32 KB D on chip per core
hw_scache = 256 KB I+D on chip per core
hw_tcache = 18 MB I+D on chip per chip
hw_ocache = None
hw_vendor = Dell Inc.
prepared_by = Dell Inc.
sw_file = ext3
sw_os000 = SUSE Linux Enterprise Server 11 SP1 (x86_64),
sw_os001 = Kernel 2.6.32.12-0.7-default
</pre><br><pre>test_sponsor = Dell Inc.
hw_avail = Apr-2011
sw_avail = Apr-2011
tester = Dell Inc.
hw_cpu_name = Intel Xeon E7-4807
hw_cpu_char = None
hw_cpu_mhz = 1867
hw_disk = 1 x 500 GB 7200 RPM SAS 6Gb
hw_fpu = Integrated
hw_memory000 = 512 GB (64 x 8 GB 4Rx8 PC3-8500R-7, ECC, running
hw_memory001 = at 800 MHz)
hw_model = PowerEdge R910 (Intel Xeon E7-4807, 1.87 GHz)
hw_ncpuorder = 2,4 chips
hw_ncores = 24
hw_nchips = 4
hw_ncoresperchip = 6
hw_nthreadspercore = 2
hw_other = None
hw_pcache = 32 KB I + 32 KB D on chip per core
hw_scache = 256 KB I+D on chip per core
hw_tcache = 18 MB I+D on chip per chip
hw_ocache = None
hw_vendor = Dell Inc.
prepared_by = Dell Inc.
sw_file = ext3
sw_os000 = SUSE Linux Enterprise Server 11 SP1 (x86_64),
sw_os001 = Kernel 2.6.32.12-0.7-default
<br><br></pre><br><br><br></div></div></div><div class="gmail_extra"><br><div class="gmail_quote">2016-03-30 16:03 GMT+03:00 HEDDE Thierry 137147 <span dir="ltr"><<a href="mailto:thierry.hedde@cea.fr" target="_blank">thierry.hedde@cea.fr</a>></span>:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
My computer server is based on :<br>
model name : Intel(R) Xeon(R) CPU E7- 4807 @ 1.87GHz<br>
with 24 physical processors<br>
<br>
it used to have hyperthreading (HT) to double the processor number but it was not working at all with WRF : as soon as I was using more than 24 proc the server performances were collapsing. We've just reboot the server without HT.<br>
<br>
best regards<br>
T HEDDE<br>
<br>
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Today's Topics:<br>
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1. Re: Use or not use HyperThreading (?????? ?????????)<br>
<br>
<br>
----------------------------------------------------------------------<br>
<br>
Message: 1<br>
Date: Mon, 28 Mar 2016 10:30:29 +0300<br>
From: ?????? ????????? <<a href="mailto:kmironakis@gmail.com">kmironakis@gmail.com</a>><br>
Subject: Re: [Wrf-users] Use or not use HyperThreading<br>
To: Julio Castro <<a href="mailto:jcastro@gac.cl">jcastro@gac.cl</a>><br>
Cc: <a href="mailto:wrf-users@ucar.edu">wrf-users@ucar.edu</a><br>
Message-ID:<br>
<<a href="mailto:CAJtVLmNWqOmDwWhjRKS6HvqVytmwztHMoGZxZs1aRtXfa9XEDw@mail.gmail.com">CAJtVLmNWqOmDwWhjRKS6HvqVytmwztHMoGZxZs1aRtXfa9XEDw@mail.gmail.com</a>><br>
Content-Type: text/plain; charset="utf-8"<br>
<br>
Hello,<br>
of course, but this job make the operating system of your PC (Linux, Unix).<br>
We need it because the HyperThreading used one arithmetic unit and two logical units in each core of the processor.<br>
When running the WRF most of the calculations of the program is not the numerical but the logical.<br>
In practice the HyperThreading has double performance.<br>
<br>
In Centos OS (Linux)<br>
if i used the top command i see something like this<br>
<br>
...<br>
<br>
PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+<br>
COMMAND<br>
11828 user1 20 0 8860 1192 844 R 786 50.0 10:00.02<br>
wrf<br>
<br>
...<br>
<br>
which mean that the WRF in a 4 core machine with HyperThreading used the ~786% (800% max) of the power and not 400%.<br>
Again, this job make automatic the linux or Unix and of course we enable the -omp option in the makefiles of WRF.<br>
<br>
<br>
Efstathios Konstantinos Mironakis<br>
<a href="http://www.forecastmaps.eu" rel="noreferrer" target="_blank">http://www.forecastmaps.eu</a><br>
<br>
<br>
<br>
2016-03-21 21:49 GMT+02:00 Julio Castro <<a href="mailto:jcastro@gac.cl">jcastro@gac.cl</a>>:<br>
<br>
> Dear Users,<br>
><br>
><br>
><br>
> Question, use or not use HyperThreading when running WRF on a single<br>
> machine?<br>
><br>
><br>
><br>
> Many thanks<br>
><br>
><br>
><br>
> *Julio Castro M.*<br>
><br>
> Ingeniero Civil, MSc., PhD.<br>
><br>
> Jefe del ?rea de Modelaci?n y Calidad del Aire<br>
><br>
> [image: cid:83969B68-5B60-49B4-AE8A-CFDE16B1D669]<br>
><br>
> Padre Mariano 103, Of. 307<br>
> Providencia, Santiago<br>
> Fono: +56 2 27195 610<br>
> Fax: +56 2 22351 100<br>
> <a href="http://www.gac.cl" rel="noreferrer" target="_blank">www.gac.cl</a><br>
><br>
><br>
><br>
><br>
><br>
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