[R] Is R on Windows multi-threaded

[Luke Tierney]

I hope to get a new version of snow released in a couple of weeks that
will work on Windows using a Windows Rmpi version or, at least on a
local machine, a socket interface.

luke

On Sat, 12 Jan 2008, Prof Brian Ripley wrote:

> On Fri, 11 Jan 2008, Greg Snow wrote:
>
>> Someone else suggested the snow package, but I don't think it is available 
>> for windows.
>
> It is.  From http://cran.r-project.org/bin/windows/contrib/2.6/ReadMe
>
>  Although the packages
>    ROracle, and snow
>  pass make check, it seems to be dangerous to distribute them:
>  I do not have the software available these packages depend on.
>
> It compiles from the sources, and using snow alone you can run socket 
> clusters on Windows (by default it expects ssh to be running, and Windows 
> machines rarely run an ssh daemon so as to accept incoming ssh).  The caution 
> is that the packages runs no tests so needs manual intervention to test it, 
> and in particular most people will want to run snow over Rmpi which does not 
> compile on Windows without more software (and some effort).
>
> It might be worth modifying snow to more easily run multiple processes on a 
> single machine.
>
>
>> I have been able to get the nws package to work on a duel core machine 
>> using windows and it did speed up my tests (and was fairly straight forward 
>> to use).
>
> Dueling cores can be apt ....
>
>> ________________________________
>> 
>> From: r-help-bounces at r-project.org on behalf of Rees, David
>> Sent: Fri 1/11/2008 7:28 AM
>> To: r-help at r-project.org
>> Subject: [R] Is R on Windows multi-threaded
>> 
>> 
>> 
>> Hi,
>> 
>> A previous thread suggests that R on Windows is multi-threaded
>> 
>> http://tolstoy.newcastle.edu.au/R/help/03b/6946.html
>> 
>> When I'm running R 2.5.1 on a dual core pc I get Rgui.exe uses up to 50%
>> of the available cpu and the rest is not used. i.e. it only uses one
>> cpu. I'm soon going to get a nice shiny new 8 cpu machine which it would
>> be very nice to fully utilize.
>> 
>> Is there any way to get R to use all the cpus - should this happen
>> automatically?
>> 
>> Many thanks,
>> 
>> Regards,
>> David
>> 
>>
>>        [[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.
>> 
>> 
>>
>> 	[[alternative HTML version deleted]]
>> 
>> ______________________________________________
>> 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.
>> 
>
>

-- 
Luke Tierney
Chair, Statistics and Actuarial Science
Ralph E. Wareham Professor of Mathematical Sciences
University of Iowa                  Phone:             319-335-3386
Department of Statistics and        Fax:               319-335-3017
    Actuarial Science
241 Schaeffer Hall                  email:      luke at stat.uiowa.edu
Iowa City, IA 52242                 WWW:  http://www.stat.uiowa.edu