[R-SIG-Mac] Performance Issues.

[Byron Ellis]

Ah, sorry. I blame the dissertation for me missing that :-)

BTW, the ridiculous fish link has some benchmarking for the Lea  
allocator.

On May 16, 2006, at 7:55 PM, Simon Urbanek wrote:

> Byron,
>
> On May 16, 2006, at 8:34 PM, Byron Ellis wrote:
>
>> Apparently somebody was having some performance issues
>>
>> http://sekhon.berkeley.edu/macosx/
>>
>> fortunately, it got dugg and someone fixed it for us
>>
>> http://ridiculousfish.com/blog/archives/2006/05/16/36/
>>
>> In an unsurprising turn of events it turns out to be malloc's fault.
>> It also looks like the build isn't against an optimized BLAS?
>>
>
> We had a discussion about this earlier, it started with
> https://stat.ethz.ch/pipermail/r-sig-mac/2006-March/002722.html
>
> What it boils down to is that ptATLAS can give you a good speed-up,
> but it can also screw you up by calling malloc/free all the time - it
> depends on the task. For single core CPUs it's definitely better to
> use R's own BLAS. For Core Duos it depends on the size of the problem
> - for bigger problems ptATLAS is better, for smaller problems
> internal BLAS may be better.
>
> In a quiet minute I'll try to run our benchmarks with Lea's allocator
> and see if it would make sense to use it for OS X.
>
> Thanks,
> Simon
>
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---
Byron Ellis (ellis at stat.harvard.edu)
"Oook" -- The Librarian