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

From: Duncan Murdoch <murdoch_at_stats.uwo.ca>
Date: Mon 07 Aug 2006 - 22:42:50 EST

Markus Preisetanz wrote:
> ... 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?
>
You are probably on a dual core or hyperthreaded machine. R does almost all of its work in one thread, so it will max out the usage on one cpu, but not more than one.

If you are on a hyperthreaded machine, you can disable hyperthreading and the report should show 100% usage, but that doesn't mean things will be going twice as fast. (I have heard that hyperthreading does slow down some computations, so turning it off might be a good idea, but I have never done the measurements myself.)

Duncan Murdoch
>
> Sincerely, Markus
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> 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@stat.math.ethz.ch
> [mailto:r-help-bounces@stat.math.ethz.ch] On Behalf Of Greene, Michael Sent: Tuesday, July 19, 2005 2:29 PM
> To: 'R-help@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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https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code. Received on Mon Aug 07 23:58:12 2006

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