[R] CPU Usage with R 2.1.0 in Windows (and with R 2.3.1)

[Prof Brian Ripley]

On Mon, 7 Aug 2006, Singu wrote:

> You could compile R using specific libraries if threading/dual core is
> the issue
> 
> Look eg here:
> http://tolstoy.newcastle.edu.au/R/devel/05/12/3355.html

Hmm, quoting me.  None of those libraries for Windows is multithreaded, 
nor does it say anthing about threads for Windows.

> and in R Administration Guide Section A.(2.2)
> .
> And probably you are better of with Linux if you rely on speed:
> http://www.r-project.org/useR-2006/Slides/IacusEtAl.pdf
> 
> Stefan
> 
> PS For Windows the precompiled Atlas  Rblas.dll seems to be
> single-threaded. I use it on my P4 3Ghz HT Processor and CPU usage is at
> 50% as well.

Yes, as Windows does not have pthreads which is what ATLAS would use.


> Markus Preisetanz schrieb:
> > ... I have exactly the same issue with R 2.3.1 . The Question is: Why is R unable to take more CPU space to make the calculation process go faster?
> >  
> > In my case no hardisk nor any network device is involved (data in RAM, 600 of 1024 MB filled) - and the CPU usage of the rgui-process does not exceed 50%.
> >  
> > Has anybody an idea? Is there a setting a can change?
> >  
> > Sincerely, Markus
> > ____________________________
> > Markus Preisetanz
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> >
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> > xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> > From: Doran, Harold <HDoran_at_air.org <mailto:HDoran_at_air.org?Subject=Re:%20%5BR%5D%20CPU%20Usage%20with%20R%202.1.0%20in%20Windows> > 
> > Date: Wed 20 Jul 2005 - 04:59:34 EST
> >
> >
> >
> > Dear Michael: 
> >
> > Why is it a problem that R is not using more CPU space than it seems to need? 
> >
> > -----Original Message----- 
> > From: r-help-bounces at stat.math.ethz.ch 
> > [mailto:r-help-bounces at stat.math.ethz.ch] On Behalf Of Greene, Michael Sent: Tuesday, July 19, 2005 2:29 PM 
> > To: 'R-help at lists.R-project.org' 
> > Subject: [R] CPU Usage with R 2.1.0 in Windows 
> >
> > Hi, 
> >
> > I'm using a fairly simple HP Compaq desktop PC running Windows 2K. When running a large process in R, the process "RGUI.exe" will never exceed 50% of the CPU usage. 
> >
> > The program used to be able to use more of the computer, but does not now. 
> > I don't believe this is a multiple processor machine. 
> >
> > Can anyone give any advice on how to solve the problem? 
> >
> > Thanks, 
> >
> > Michael Greene 
> >
> > Product Management 
> > Plymouth Rock Assurance Corp 
> > 617-951-1682 
> >
> >
> > 	[[alternative HTML version deleted]]
> >
> >   
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> >
> 
> ______________________________________________
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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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