[Wrf-users] HyperThreading

Κώστας Μυρωνάκης kmironakis at gmail.com
Wed Mar 30 23:21:51 MDT 2016 

Hi,
please try again the difference is double and if they can do these persons
you must try.

1.Prossesor  2.cores 3.chips 4.core/chip 5.copies 6.results
Intel Xeon E7-4807, 1.87 GHz   12  2   6   24   251
Intel Xeon E7-4807, 1.87 GHz   24  4   12  48   499

the 1st  system has 2 chip and the second 4 chip both of them placed at
PowerEdge R910 Dell.

Maybe this can help you, configuration of the first and the second system.

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


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





2016-03-30 16:03 GMT+03:00 HEDDE Thierry 137147 <thierry.hedde at cea.fr>:

> Hi,
> My computer server is based on :
> model name      : Intel(R) Xeon(R) CPU E7- 4807  @ 1.87GHz
> with 24 physical processors
>
> 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.
>
> best regards
> T HEDDE
>
> -----Message d'origine-----
> De : wrf-users-bounces at ucar.edu [mailto:wrf-users-bounces at ucar.edu] De la
> part de wrf-users-request at ucar.edu
> Envoyé : lundi 28 mars 2016 20:00
> À : wrf-users at ucar.edu
> Objet : Wrf-users Digest, Vol 139, Issue 32
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> Today's Topics:
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>    1. Re: Use or not use HyperThreading (?????? ?????????)
>
>
> ----------------------------------------------------------------------
>
> Message: 1
> Date: Mon, 28 Mar 2016 10:30:29 +0300
> From: ?????? ?????????  <kmironakis at gmail.com>
> Subject: Re: [Wrf-users] Use or not use HyperThreading
> To: Julio Castro <jcastro at gac.cl>
> Cc: wrf-users at ucar.edu
> Message-ID:
>         <
> CAJtVLmNWqOmDwWhjRKS6HvqVytmwztHMoGZxZs1aRtXfa9XEDw at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
>
> Hello,
> of course, but this job make the operating system of your PC (Linux, Unix).
> We need it because the HyperThreading used one arithmetic unit and two
> logical units in each core of the processor.
> When running the WRF most of the calculations of the program is not the
> numerical but the logical.
> In practice the HyperThreading has double performance.
>
> In Centos OS (Linux)
> if i used the top command i see something like this
>
> ...
>
>   PID USER      PR  NI  VIRT  RES  SHR S   %CPU %MEM    TIME+
> COMMAND
> 11828 user1       20   0  8860 1192  844 R       786     50.0      10:00.02
> wrf
>
> ...
>
> which mean that the WRF in a 4 core machine with HyperThreading used the
> ~786% (800% max) of the power and not 400%.
> Again, this job make automatic the linux or Unix and of course we enable
> the -omp option in the makefiles of WRF.
>
>
> Efstathios Konstantinos Mironakis
> http://www.forecastmaps.eu
>
>
>
> 2016-03-21 21:49 GMT+02:00 Julio Castro <jcastro at gac.cl>:
>
> > Dear Users,
> >
> >
> >
> > Question, use or not use HyperThreading when running WRF on a single
> > machine?
> >
> >
> >
> > Many thanks
> >
> >
> >
> > *Julio Castro M.*
> >
> > Ingeniero Civil, MSc., PhD.
> >
> > Jefe del ?rea de Modelaci?n y Calidad del Aire
> >
> > [image: cid:83969B68-5B60-49B4-AE8A-CFDE16B1D669]
> >
> > Padre Mariano 103, Of. 307
> > Providencia, Santiago
> > Fono: +56 2 27195 610
> > Fax: +56 2 22351 100
> > www.gac.cl
> >
> >
> >
> >
> >
> > _______________________________________________
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