On 17/05/2006, at 8:00 PM, Simon Urbanek <[EMAIL PROTECTED] project.org> wrote: > > 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. >
A posting from the Scitech mailing list may be of interest. Date: Thu, 4 May 2006 13:14:35 -0700 From: Ian Ollmann <[EMAIL PROTECTED]> Subject: Re: No Accelerate.framework threading on Intel To: [EMAIL PROTECTED] Message-ID: <[EMAIL PROTECTED]> Content-Type: text/plain; charset=US-ASCII; delsp=yes; format=flowed Accelerate's BLAS is currently not threaded on Intel. The version that is currently out was tuned for the developer preview machines -- Pentium 4, uniprocessor. On those machines, threading just got mapped to hyperthreading which didn't do much but slow it down. The other parts of Accelerate.framework should generally be in much better shape. We're working hard to patch up the remaining holes. _______________________________________________ R-SIG-Mac mailing list R-SIG-Mac@stat.math.ethz.ch https://stat.ethz.ch/mailman/listinfo/r-sig-mac
