[R-SIG-Mac] Performance Issues.

Simon Urbanek simon.urbanek at r-project.org
Wed May 17 04:55:25 CEST 2006


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

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.


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