[R-SIG-Mac] ATLAS BLAS

[Steven McKinney]

Dear Simon,

None of it is vague anymore.
Thank you very much!

Steven McKinney

________________________________________
From: Simon Urbanek [simon.urbanek at r-project.org]
Sent: October 20, 2010 6:39 PM
To: Steven McKinney
Cc: R-SIG-Mac at stat.math.ethz.ch
Subject: Re: [R-SIG-Mac] ATLAS BLAS

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
>
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