AFAIK all P4s are SSE2. He wants a Windows ATLAS build, and that is not hard, but you have to do that under Cygwin not MinGW.
We have a Xeon, but have found Athlons and now Opterons better value. I don't have access to Windows Xeon machine: anyone who does could contribute a Xeon version of Rblas.dll (to Uwe Ligges, please). Note that for 1.9.0 you can use Goto's BLAS and he as a P4 version that is faster than ATLAS (under Windows). So I would start with that. Although Thomas Lumley is right about cache sizes, using a P4 512kb ATLAS or Goto BLAS is pretty good on a Xeon (only tested by me under Linux). Using a BLAS for too large a cache is disastrous, but underestimating by a factor of 2 is not bad at all. (I think most Xeons are 1Mb cache, with Xeon MP being 4Mb.) On 12 Mar 2004, Peter Dalgaard wrote: > [EMAIL PROTECTED] writes: > > > I am about to get a new machine at work - an IBM Intellistation with the > > Xeon 2.8 GB processor. It will run Windows 2000. I would like to install > > the proper ATLAS dll for this machine, but I am not sure if Xeon is P4? > > Does anybody have any experience with Xeon? > > Yes, we have a dual 2.8 Xeon running Linux. Very nice machine. We've > had it for a bit more than a year and it's been of very good use. I > can see that I did two ATLAS builds in feb 2003, one is called > Linux_P4SSE2_2 and the other is Linux_Xeon_2. AFAIR (but it's been a > while), the former is the preconfigured thing that came out of a > quick-install and the other one is fully tuned version, and there was > no difference worth speaking of between the two. > > I think the difference between P4 and Xeon is the SSE1 vs SSE2 thing, > so you'd want the P4SSE2 DLL, but others may be able to speak more > authoritatively. > > -- Brian D. Ripley, [EMAIL PROTECTED] 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 ______________________________________________ [EMAIL PROTECTED] mailing list https://www.stat.math.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide! http://www.R-project.org/posting-guide.html
