[R] Xeon CPU and ATLAS

[Peter Dalgaard]

rossini at blindglobe.net (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,
"lannerfalk" (which you shared an office with for a while) is a P4,
with SSE2, and actually quite difficult to tell apart from the Xeon
chips in "turmalin":

CPU: L1 I cache: 12K, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Hyper-Threading is disabled
CPU:             Common caps: 3febfbff 00000000 00000000 00000000
CPU0: Intel(R) Pentium(R) 4 CPU 2.20GHz stepping 04

vs.

CPU: Trace cache: 12K uops, L1 D cache: 8K
CPU: L2 cache: 512K
CPU: Physical Processor ID: 0
Intel machine check reporting enabled on CPU#1.
CPU:     After generic, caps: bfebfbff 00000000 00000000 00000000
CPU:             Common caps: bfebfbff 00000000 00000000 00000000
CPU1: Intel(R) Xeon(TM) CPU 2.80GHz stepping 07

And their /proc/cpuinfo entries are also similar except for the clock
speed and number of siblings. So SSE2 is certainly not the difference
between P4 and Xeon - stepping number issue, perhaps?

-- 
   O__  ---- Peter Dalgaard             Blegdamsvej 3  
  c/ /'_ --- Dept. of Biostatistics     2200 Cph. N   
 (*) \(*) -- University of Copenhagen   Denmark      Ph: (+45) 35327918
~~~~~~~~~~ - (p.dalgaard at biostat.ku.dk)             FAX: (+45) 35327907