On 13 Mar 2004, Peter Dalgaard wrote: > [EMAIL PROTECTED] (A.J. Rossini) writes: > > > > 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. > > > > SSE1 vs SSE2 is PIII vs PIV (so depends if your xeons are p3 or p4 (? > > not sure if there is such a thing) based. > > Sure? I have > > turmalin:/usr/local/src/ATLAS/>ls CONFIG/ARCHS/ > 21164.tgz ConfDump.log Makefile PIIISSE1.tgz PPCG4AltiVec.tgz > 21164GOTO.tgz CreateDef.sh P4SSE1.tgz POWER.tgz PPRO.tgz > 21264.tgz CreateDirs.sh P4SSE2 POWER2Thin.tgz SGIIP28.tgz > 21264GOTO.tgz CreateTar.sh P4SSE2.tgz POWER3.tgz SGIIP30.tgz > ATHLON.tgz HP9735.tgz P5MMX.tgz PPC604.tgz SunUS2.tgz > ATHLON3DNow2.tgz IA64Itan.tgz PII.tgz PPC604e.tgz SunUS5.tgz > ATHLONSSE1.tgz KillDirs.sh PIII.tgz PPCG4.tgz negflt.c > > so it would seem that there's both P4SSE1 and PIIISSE1. However,
That's because ATLAS did not always support SSE2, and it might be faster not to use it on some systems. >From Intel's Xeon FAQ http://www.intel.com/cd/ids/developer/asmo-na/eng/19250.htm We had XMM on Pentium� III. What is the difference on Intel Xeon? Intel Xeon offers SSE2 technology. In addition to the features of SSE, SSE2 provides support for additional simultaneous 128-bit integer and double-precision floating point calculations. which seems the definitive answer re Xeons. (I am 99% sure all P4s have the same instructions set which includes SSE2. The main Xeon differences are that multi-processor systems are allowed and the caches are usually larger than contemporaneous P4s.) -- 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
