[Pw_forum] Seeking Advice on Small Hardware Platforms for PWscf Implementation

[Paul M. Grant]

Thanks for the feedback.  The two dual Xeon boards I have were originally
chosen to host my website.  I long suspected that there was "thrashing"
between the two processors when performing numerically intensive
calculations.  I assume the same would occur within the cores of a single
processor as well?  However, my understanding was this approach was supposed
to better implement matrix manipulation for gaming applications.  If so, one
would assume improved performance for the fft operations at the "core" of
pw.x.

Paul M. Grant, PhD
Principal, W2AGZ Technologies
Visiting Scholar, Applied Physics, Stanford University
EPRI Science Fellow (Retired)
IBM Research Staff Member Emeritus
w2agz at pacbell.net
http://www.w2agz.com
 
 

-----Original Message-----
From: pw_forum-bounces at pwscf.org [mailto:pw_forum-bounces at pwscf.org] On
Behalf Of Alexander Shaposhnikov
Sent: Tuesday, November 20, 2007 1:02 AM
To: PWSCF Forum
Subject: Re: [Pw_forum] Seeking Advice on Small Hardware Platforms for PWscf
Implementation

Actually newer  Woodcrest/Clovertown Xeon platform  have dual independent 
FSBs, but this does not help much. Memory bandwidth available on each FSB is

very limited - between  1/2 and 1/3  of what is available to modern desktop 
CPUs.

There is no good "server" computational platform today,  unfortunately  . 
AMD's CPUs have  weak FPU  and Intel's have weak memory subsystem. Intel- 
based desktop single-socket platform is the best choice for now.

On Tuesday 20 November 2007 14:33, Paolo Giannozzi wrote:
> On Nov 20, 2007, at 4:07 , Paul M. Grant wrote:
> >  Currently, I use two machines with dual Xeon processors
>
> dual Xeon? very bad choice. They have a single memory
> bus, so if you run two processes on the same motherboard,
> they spend most of the time waiting for access to memory.
>
> P.
> ---
> Paolo Giannozzi, Dept of Physics, University of Udine
> via delle Scienze 208, 33100 Udine, Italy
> Phone +39-0432-558216, fax +39-0432-558222
>
>
>
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