[R] Programmaticly finding number of processors by R code

[Prof Brian Ripley]

Without knowing your OS, there is no way anyone can tell you.  And you 
probably want to know 'cores' rather than CPUs. And for some specific 
OSes, you will find answers in the archives.

Beware that this is not a well-defined question: are these 
physical or virtual cores?, and having them in the system and being 
allowed to use them are different questions.

Package 'multicore' is one that attempts to do this in its function 
detectCores (see the source code).  And on Sparc Solaris it is pretty 
useless as it gives virtual CPUs, 8x the number of real CPUs.

On Sun, 3 Oct 2010, Ajay Ohri wrote:

> Dear List
>
> Sorry if this question seems very basic.
>
> Is there a function to pro grammatically find number of processors in
> my system _ I want to pass this as a parameter to snow in some serial
> code to parallel code functions
>
> Regards
>
> Ajay
>
>
>
> Websites-
> http://decisionstats.com
> http://dudeofdata.com
>
>
> Linkedin- www.linkedin.com/in/ajayohri
>
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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