[Wrf-users] Use or not use HyperThreading

[Κώστας Μυρωνάκης]

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 Área de Modelación 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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