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R for Windows server

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R for Windows server

Marco Geraci
Hi,
  I need to run a burdensome simulation. I'm using a Dell PowerEdge 2850, 3.8 Ghz CPU, 2 Gb RAM, Windows server 2003, 32 bit. The task manager indicates that Rgui.exe is using 25% of the CPU speed. There is no other process that is slowing down R.
  Does anyone know if it's a limitation of R? If so, can I set up the program for the CPU usage like I do for the memory usage? Is there a version of R for servers?
  Thank you in advance,
  Marco Geraci

                       
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Re: R for Windows server

Prof Brian Ripley
Is hyperthreading on?  In that case the maximum is 50% ....
Are there two processors?  In that case the maximum is 25% ....

On Wed, 14 Dec 2005, Marco Geraci wrote:

>  I need to run a burdensome simulation. I'm using a Dell PowerEdge 2850,
> 3.8 Ghz CPU, 2 Gb RAM, Windows server 2003, 32 bit. The task manager
> indicates that Rgui.exe is using 25% of the CPU speed.

Don't believe the task manager, especially on a machine with
hyperthreading.

> There is no other
> process that is slowing down R.

>  Does anyone know if it's a limitation of R? If so, can I set up the
> program for the CPU usage like I do for the memory usage? Is there a
> version of R for servers?

No, R runs at close to 100% of possible on properly configured Windows
machines.

--
Brian D. Ripley,                  [hidden email]
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Re: R for Windows server

Philippe Grosjean
In reply to this post by Marco Geraci
Hello,

You don't tell us much info (what processor(s) are exactly in your
server?). You must know the following:

1) Windows server prioritizes client accesses over local running
programs (but you say there is no other process slowing down R... is it
deconnected from the network?),

2) Rgui uses only one processor (at least, if you did not customized the
default installation). Take care that, for instance, with an Intel
HyperThreading (HT) Pentium IV processor, the system is working as if it
was a bi-processor config with a single processor... and the task
manager will not report more than 50% of CPU use for RGui.exe. Thus, I
can imagine that, if you have a bi-processor hyperthreading config, it
could report only 25% of CPU use.
Best,

Philippe Grosjean

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Marco Geraci wrote:

> Hi,
>   I need to run a burdensome simulation. I'm using a Dell PowerEdge 2850, 3.8 Ghz CPU, 2 Gb RAM, Windows server 2003, 32 bit. The task manager indicates that Rgui.exe is using 25% of the CPU speed. There is no other process that is slowing down R.
>   Does anyone know if it's a limitation of R? If so, can I set up the program for the CPU usage like I do for the memory usage? Is there a version of R for servers?
>   Thank you in advance,
>   Marco Geraci
>
>
> ---------------------------------
>
>
> [[alternative HTML version deleted]]
>
> ______________________________________________
> [hidden email] mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
>
>

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