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Subject: Re: [OMPI users] scaling problem with openmpi
From: Peter Kjellstrom (cap_at_[hidden])
Date: 2009-05-20 14:39:44


On Wednesday 20 May 2009, Roman Martonak wrote:
> I tried to run with the first dynamic rules file that Pavel proposed
> and it works, the time per one MD step on 48 cores decreased from 2.8
> s to 1.8 s as expected. It was clearly the basic linear algorithm that
> was causing the problem. I will check the performance of bruck and
> pairwise on my HW. It would be nice if it could be tuned further.

I'm guessing you'll see even better performance if you change 8192 to 131072
in that config file. That moves up the cross over point between "bruck"
and "pair wise".

/Peter

> Thanks
>
> Roman