[R-SIG-Mac] How to Speed up R on the G5

Michael Redmond redmond at cs.wisc.edu
Tue Feb 8 00:33:10 CET 2005

What settings did you change in the compiler lines? I assume this was on 
gcc and g77?
Mike Redmond

Simon Urbanek wrote:
> On Feb 7, 2005, at 10:47 AM, Thomas Lumley wrote:
>>> My second question is whether there are ways other than using
>>> --with-blas="-framework vecLib", to take advantage of what I thought
>>> was the power of the G5 (or dual G5s in my case).
>> I haven't found anything very impressive yet (this is on an iMac G5, 
>> so with much lower bus speed).
> Just enabling G5 optimizations without any other aggressive flags gave 
> me 30% boost on the code I was testing (on a dual G5 - btw: just in case 
> someone didn't know - for computations one R process uses only one 
> processor). But I think vecLib should be pretty well optimized by Apple 
> already, so I don't know of any much faster BLAS implementation for OS X 
> ...
> Cheers,
> Simon
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