[R] Dismal R performance of Athlon moble CPU?

Prof Brian Ripley ripley at stats.ox.ac.uk
Thu Jul 24 09:14:38 CEST 2003

R is not supported under Cygwin, so that won't help, and is in any case 

However, under Windows you can make use of ATLAS, and that is fully
documented: we even provide versions of Rblas.dll for common chips. Part
of my point was that a mobile Athlon will very likely need different
tuning from your Athlon XP.

The R developers have gone to considerable trouble to make ATLAS-tuned 
versions possible under Windows, so why ignore their efforts, Mr Borasky?

On Wed, 23 Jul 2003, M. Edward Borasky wrote:

> I haven't gotten around to assembling the toolset required to build R on
> Windows, since most of what I do is smallish interactive problems. However,
> another possibility would be to load CygWin/XFree86 on your laptop (which
> I've done), then download Atlas 3.5.7 from SourceForge (which I've done),
> then build Atlas with CygWin(which I've done) and then build a second
> version of R under CygWin using Atlas, and use the CygWin/Atlas R for the
> heavy number-crunching jobs. This last I haven't done, so I can't say
> whether there are any gotchas, but everything else I've done with
> CygWin/XFree86 has worked. My laptop is a Compaq Presario with a 1.67 GHz
> Athlon XP. Atlas screams on it; the Atlas folks were grinning when I sent
> them the log. Atlas has an assembly language kernel for Athlons (and P4s as
> well IIRC).
> Oh, yeah ... If you do try my scheme, make sure you don't have spaces in the
> paths ... Atlas still isn't immune to that sort of thing under CygWin.

Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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