[R] Multithreading

[Liaw, Andy]

> From: Peter Dalgaard BSA [mailto:p.dalgaard at biostat.ku.dk]
> 
> Lennart.Araskoug at astrazeneca.com writes:
> 
> > Hi !
> > 
> > I wonder if the R application is capable of utilizing more 
> than one CPU. I
> > need to know since we run it on a SunFire 3800 with 8 750 
> USIII cpu:s and on
> > a E420R with 4 USII cpu:s and we don't feel like we get the 
> performance we
> > could expect.
> > 
> > I've seen some old discussions claiming that it isn't.
> 
> It isn't ... yet. Duncan and Luke hope to get it going for 1.6.0.
> 
> You can in principle link against a threaded ATLAS library (although
> there are known signal handling problems with that) and get multi-CPU
> numerics performance. And of course run multiple instances of R.

When I was fooling with ATLAS and MKL a while ago, I found that when I use
the threaded ATLAS, the elapsed time is actually longer than ATLAS w/o
threads.  MKL, OTOH, did provide the almost doubled speed expected on the
dual CPU box.  (Mandrake 7.1/R1.4.1/P3-866 Xeon).

Andy

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