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Re: [ESPResSo] Espresso performance with gcc 4.3

From: Mehmet Sayar
Subject: Re: [ESPResSo] Espresso performance with gcc 4.3
Date: Mon, 17 Aug 2009 15:26:47 +0300
User-agent: Thunderbird (X11/20090608)

Hi Axel,

That is quite bad.

What ever the problem is, it is not platform specific either.
Now I reproduced the same poor results on an Dual core AMD Opteron machine (the other was a Xeon 8-core).


Axel Arnold wrote:
On Monday 17 August 2009 12:57, Mehmet Sayar wrote:
Hi everybody,

I am having some trouble with performance of Espresso which is compiled
with gcc 4.3. At least that is my best guess regarding the origin of the

I have a couple of 8-core machines with Suse 10.2 installed. I recently
updated one of them to Suse 11.1. The machines have exactly the same
architecture. Under Suse 11.1 Espresso's performance is more than 10 times

Gromacs displays the same problem.

When I look at the common libraries between Espresso and Gromacs, I suspect
either the gcc or the lamd installations as the source of the problem.

However I tested the performance of Espresso with mpi-fake. And the
performance is still terrible under Suse 11.1. That leaves gcc as the only


gcc 4.3 or actually OpenSuSE 11.1 should also not be the problem, because I have a machine with it where Espresso works fine. So, seems more like a problem with OpenSuSE 11.1 on your hardware... It could be some problem with the NUMA e.g. . However, I cannot really tell how you can check that.


Mehmet Sayar - Assist. Prof.  Koc University
Email:address@hidden        Dept. Mechanical Eng.
Phone:+90-212-338-1840        Rumelifeneri Yolu, Sariyer
Fax:  +90-212-338-1548        34450 Istanbul, Turkey

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