[MITgcm-support] MITgcm on AS4, kernel 2.6

[Stefano Querin]

Hi Hezi,
I'm running on a Sun Opteron 64 Cluster with Rocks OS (Linux kernel 2.6).
After the upgrade (from kernel 2.4 to 2.6) I hoped to obtain better 
performances in terms of CPU time (people in Trieste achieved a 30% 
improvement running some of their own codes): on the contrary, the 
computation time was a bit higher than before and the scalability was not 
that good (but I encountered this latter problem also with the old kernel). 
I didn't check if the results of the same executable were different (I took 
it for granted...), I will do it as soon as possible.

Cheers,

Stefano


----- Original Message ----- 
From: "Hezi Gildor" <hezi.gildor at weizmann.ac.il>
To: <mitgcm-support at mitgcm.org>
Cc: <jerry.Mersel at weizmann.ac.il>
Sent: Thursday, October 06, 2005 3:50 PM
Subject: [MITgcm-support] MITgcm on AS4, kernel 2.6


>
> Dear all,
>
> did anyone used the MITgcm on Opteron cluster running AS4 or 4.1 (Linux 
> Kernel 2.6)?
>
> we tried on on a local machine and encounter strange behavior. e.g., 
> running the same executable twice gives somewhat different results. On 
> Linux kernel 2.4 it seems to work ok.
>
> thanks, hezi.
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