[R] CPU Usage with R 2.1.0 in Windows

Prof Brian Ripley ripley at stats.ox.ac.uk
Wed Jul 20 10:12:07 CEST 2005

It probably is not a problem to leave hyperthreading on: we found little 
performance difference on a P4 either way.

The Windows task manager is misleading, as `50%' is about as much as a 
P4-class processor with hyperthreading can actually deliver.

On Tue, 19 Jul 2005, Lukasz Komsta wrote:

> Dnia 2005-07-19 20:28, Uÿÿytkownik Greene, Michael napisaÿÿ:
>> 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.
> If you have hyperthreading, R catches only one virtual processor (fromtwo available), being not able to exceed half of total power (100% ofone only). If you want to use full power, you should turn hyperthreadingoff, if your BIOS supports such option.
> Regards,
> -- Lukasz KomstaDepartment of Medicinal ChemistryMedical University of Lublin6 Chodzki, 20-093 Lublin, PolandFax +48 81 7425165
> ______________________________________________R-help at stat.math.ethz.ch mailing listhttps://stat.ethz.ch/mailman/listinfo/r-helpPLEASE do read the posting guide! http://www.R-project.org/posting-guide.html

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)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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