R help - Jul 2012 - CPU usage while running R code

I am currently running an R program on a computer with 16 Gb memory (Windows7,
64 bit). When I look at the task manager, I see that only 4 out of the 8 CPUs
are being used. Is this due to some missing in the R code, or should I change
something to the settings of the computer?


Laurent Franckx, PhD
Expert
VITO NV
Boeretang 200, 2400 MOL, Belgium
Tel. + 32 14 33 58 22
Skype: laurent.franckx
laurent.franckx at vito.be
Visit our website: www.vito.be/english and http://www.vito.be/transport







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Dear Laurent,

An R proces uses only one core. It is possible to use multiple cores. Have a
look at he Hig-Performance and Parallel Computing task view
(http://cran.freestatistics.org/web/views/HighPerformanceComputing.html)

Best regards,

Thierry

ir. Thierry Onkelinx
Instituut voor natuur- en bosonderzoek / Research Institute for Nature and
Forest
team Biometrie & Kwaliteitszorg / team Biometrics & Quality Assurance
Kliniekstraat 25
1070 Anderlecht
Belgium
+ 32 2 525 02 51
+ 32 54 43 61 85
Thierry.Onkelinx at inbo.be
www.inbo.be

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asking him to perform a post-mortem examination: he may be able to say what the
experiment died of.
~ Sir Ronald Aylmer Fisher

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~ Roger Brinner

The combination of some data and an aching desire for an answer does not ensure
that a reasonable answer can be extracted from a given body of data.
~ John Tukey

-----Oorspronkelijk bericht-----
Van: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
Namens Franckx Laurent
Verzonden: woensdag 4 juli 2012 10:29
Aan: 'r-help at r-project.org'
Onderwerp: [R] CPU usage while running R code

I am currently running an R program on a computer with 16 Gb memory (Windows7,
64 bit). When I look at the task manager, I see that only 4 out of the 8 CPUs
are being used. Is this due to some missing in the R code, or should I change
something to the settings of the computer?


Laurent Franckx, PhD
Expert
VITO NV
Boeretang 200, 2400 MOL, Belgium
Tel. + 32 14 33 58 22
Skype: laurent.franckx
laurent.franckx at vito.be
Visit our website: www.vito.be/english and http://www.vito.be/transport







http://www.vito.be/e-maildisclaimer

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R does not parallelize its operation automatically... you have to use R code
that splits the work you give it into multiple tasks.

See ?parallel
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Franckx Laurent <laurent.franckx at vito.be> wrote:
>I am currently running an R program on a computer with 16 Gb memory
>(Windows7, 64 bit). When I look at the task manager, I see that only 4
>out of the 8 CPUs are being used. Is this due to some missing in the R
>code, or should I change something to the settings of the computer?
>
>
>Laurent Franckx, PhD
>Expert
>VITO NV
>Boeretang 200, 2400 MOL, Belgium
>Tel. + 32 14 33 58 22
>Skype: laurent.franckx
>laurent.franckx at vito.be
>Visit our website: www.vito.be/english and http://www.vito.be/transport
>
>
>
>
>
>
>
>http://www.vito.be/e-maildisclaimer
>
>______________________________________________
>R-help at r-project.org mailing list
>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.