Subject: summary :g03c 64bits vs 32 bits for opteron/athlon 64

From: Bertrand Illien <Bertrand.Illien{at}univ-nantes.fr>
Date: Fri, 22 Oct 2004 17:15:49 +0200

FIRST MESSAGE

>>
>> we would like to buy a new computer for use with G03/linux.
>> have you got few benchs time results of  g03revC. test files ( 
>> test397 is fine)
>> with 1/ g03 64bits compiled for opteron  (or/and  athlon 64)
>>        2/ g03 32 bits (compiled for pentium 4) on  the same opteron 
>> (or/and athlon 64)
>>   
>
>> does the 64bits compilation vs 32 bits improve performances ?
>>
>> does the new intel xeon with EM 64  perform better  than  P4 (1MB in 
>> L2)  with G03 32 bits program ?
>> thanks for your help.
>> sincerely yours
>>
>> Bertrand
>
SUMMARY

timing for test397.com  :
2Ghz  AMD64 (3200+, L2:1MB, socket 754) running Fedora Core 2 .  Codes 
compiled using portland 5.1
<>   - 32 bits: 10678.677u
   - 64 bits: 10459.699u
<>

Negligibly faster in 64 bits, but with advantage of large scratch files
(>16 Gb) and more than 2Gb memory handling for large jobs.

END SUMMARY

We also take an interest in test397 timings for others CPU :

opteron 248 or 250 

xeon 3.0 Or 3.2GHz (FSB 533, L2=512KB, L3=1MB) 

Thanks in advance

Bertrand

______________________________________________________________________
Bertrand ILLIEN
Laboratoire de Spectrochimie et Modilisation
EA 1149 - FR CNRS 2465
Faculti des Sciences et Techniques
2, rue de la Houssinihre BP 92208
44322 Nantes Cedex 3 FRANCE
Tel :(+33)(0)2 51 12 55 65 - Fax : 55 67
http://www.sciences.univ-nantes.fr/spectro