luke at stat.umn.edu
Tue Apr 16 14:12:00 CEST 2002
On Tue, Apr 16, 2002 at 08:00:17AM -0400, Liaw, Andy wrote:
> > 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).
As I recall I did get about double speed with threaded ATLAS on a dual
P3 processor with the one or two examples I tread. (SuSE
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