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List:       beowulf
Subject:    Re: [Beowulf] Strange Opteron 2350 performance: Gaussian-03
From:       "Li, Bo" <libo () buaa ! edu ! cn>
Date:       2008-06-28 16:07:07
Message-ID: 000a01c8d939$091b5a90$6300a8c0 () LIBO
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Hello,
I am afraid there must be something wrong with your experiment.
How did you get the performance? Was your DFT codes running in parallel? Any \
optimization involved? In most of my test, K8L or K10 can beat old opteron at the \
same frequency with about 20% improvement. Regards,
Li, Bo
----- Original Message ----- 
From: "Mikhail Kuzminsky" <kus@free.net>
To: <beowulf@beowulf.org>
Sent: Saturday, June 28, 2008 11:48 PM
Subject: [Beowulf] Strange Opteron 2350 performance: Gaussian-03


> I'm runnung a set of quad-core Opteron 2350 benchmarks, in particular 
> using Gaussian-03 (binary version from Gaussian, Inc, i.e. translated 
> by more old - than current - pgf77 version, for Opteron target).
> 
> I compare in particular *one core* of Opteron 2350 w/Opteron 246 
> having the same 2 Ghz frequency and the same amount of cache per core 
> (512K L2 + 0.25*2 MB L3 for Opteron 2350 is just 1 MB L2 for Opteron 
> 246). Opteron 246 has even more fast DDR2-667 RAM.
> 
> The Gaussian-03 performance in some cases is close for both Opteron's 
> (I remember that compilation didn't know about Barcelona !), but for 
> very popular DFT method Opteron 2350 cores looks as slow: one job 
> gives 33% more bad (than Opteron 246) performance. 
> 
> But on standard Gaussian-03 test397.com DFT/B3LYP test: *one* (1) 
> Opteron 2350 core run 15667 sec. (both startstop and cpu) vs 8709 sec. 
> on (one) Opteron 246 !! 
> 
> There is no powersaved daemon, so the frequnecy of Opteron 2350 is 
> fixed to 2 Ghz. I reproduced this result twice on Opteron 2350, in 
> particular one time using forced good numactl behaviour. I'm 
> reproducing it on Opteron 246 again :-) but I have indirect 
> confirmation of this timings (based on 2-cpus Opteron 246 parallel 
> test).
> 
> Yes, AFAIK DFT method is cache-friendly, and more slow L3 cache in 
> Opteron 2350 may give more bad performance. But in 1.8 times ??
> 
> Any your comments are welcome.
> 
> Mikhail Kuzminsky
> Computer Assistance to Chemical Research Center
> Zelinsky Institute of Organic Chemistry
> Moscow
> 
> 
> 
> 
> 
> 
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