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

Mike Saunders mike_saunders at umenfa.maine.edu
Mon Aug 7 14:40:16 CEST 2006


My guess is that you have either a dual-core or a hyperthreaded processor. 
Hyperthreading caps the CPU usage for any process at 50%.  It can be shut 
off by going through the BIOS setup for your machine.  For the dual-core, I 
am not sure if you can configure the BIOS to use both processors for one 
particular task (I don't have a dual core).


Mike R. Saunders
Forest Biometrician
Cooperative Forest Research Unit
University of Maine
5755 Nutting Hall
Orono, ME  04469-5755

207-581-2763 (O)
207-581-2833 (F)

----- Original Message ----- 
From: "Markus Preisetanz" <Markus.Preisetanz at clientvela.com>
To: <R-help at stat.math.ethz.ch>
Sent: Monday, August 07, 2006 8:31 AM
Subject: Re: [R] CPU Usage with R 2.1.0 in Windows (and with R 2.3.1)

... 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 

Has anybody an idea? Is there a setting a can change?

Sincerely, Markus
Markus Preisetanz

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From: Doran, Harold <HDoran_at_air.org 
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 

-----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


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?


Michael Greene

Product Management
Plymouth Rock Assurance Corp

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