[R-SIG-Mac] ATLAS BLAS

[Simon Urbanek]

On Oct 20, 2010, at 10:53 PM, huang min wrote:

> Does this binary of ATLAS also work on a Core 2 Duo cpu? Thanks.
> 

It does, but it's optimized for a 16-thread machine, so it will spawn way too many threads for a core 2 duo. Still, I'm surprised that even that can be faster than vecLib (although not by much - 15.7s vs 20.7s on the tcrossprod test). Note that the vecLib bug only affects Mac Pros (AFAICT) so with other machines you can still stick with vecLib.

Cheers,
Simon


> Huang
> 
> On Thu, Oct 21, 2010 at 9:39 AM, Simon Urbanek <simon.urbanek at r-project.org> wrote:
> On Oct 20, 2010, at 7:35 PM, Steven McKinney wrote:
> 
> > I have R 2.11.1 installed (soon will update to R 2.12) and I appear to have a Nehalem-based Mac Pro.
> >
> > I'm trying to find documentation about how to set up R on my Mac so I'm using the ATLAS BLAS.
> >
> 
> Well, you have to get it [=ATLAS] first. Then it's as easy as pointing the libRblas.dylib symlink to it.
> 
> 
> I have a binary of ATLAS that you can use if you have Mac OS X 10.6 (Snow Leopard) it's at
> http://r.research.att.com/libatlas-MacPro.dylib
> 
> So the copy/paste steps (you have to be admin) are:
> 
> cd /Library/Frameworks/R.framework/Resources/lib
> curl -O http://r.research.att.com/libatlas-MacPro.dylib
> chmod a+x libatlas-MacPro.dylib
> ln -sfn libatlas-MacPro.dylib libRblas.dylib
> 
> 
> ## if you want to go back to vecLib
> cd /Library/Frameworks/R.framework/Resources/lib
> ln -sfn libRblas.vecLib.dylib libRblas.dylib
> 
> ## if you want to use R's BLAS (not as fast but more reliable)
> cd /Library/Frameworks/R.framework/Resources/lib
> ln -sfn libRblas.0.dylib libRblas.dylib
> 
> 
> > I installed this version of R using the Mac installer R-2.11.1.pkg.
> > Does this installer set up R that uses the ATLAS BLAS, or are there
> > additional steps I need to take to have R use the ATLAS BLAS?
> >
> > Once R is up and running, can anyone tell me how I can determine
> > which BLAS R is using?
> >
> 
> Indirectly, just look at the output of
> ls -l /Library/Frameworks/R.framework/Resources/lib/libRblas.dylib
> 
> Cheers,
> Simon
> 
> 
> 
> > Any info appreciated.
> >
> >
> >
> >> sessionInfo()
> > R version 2.11.1 (2010-05-31)
> > x86_64-apple-darwin9.8.0
> >
> > locale:
> > [1] en_CA.UTF-8/en_CA.UTF-8/C/C/en_CA.UTF-8/en_CA.UTF-8
> >
> > attached base packages:
> > [1] stats     graphics  grDevices utils     datasets  methods   base
> >
> > loaded via a namespace (and not attached):
> > [1] tools_2.11.1
> >
> >
> >
> >
> > Steven McKinney
> >
> > _______________________________________________
> > R-SIG-Mac mailing list
> > R-SIG-Mac at stat.math.ethz.ch
> > https://stat.ethz.ch/mailman/listinfo/r-sig-mac
> >
> >
> 
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