[Beowulf] Slection from processor choices; Requesting Giudence

[Geoff Jacobs]

laytonjb at charter.net wrote:
<snip>
> - The network/MPI combination is fairly critical to good performance and to
> price/performance. I have done some benchmarks where the right MPI library
> on GigE produces faster results than a bad MPI library on Myrinet. Seems
> counter-intuitive, but I've seen it.
> - The MPI is pretty important to good performance particularly on GigE. One
> benchmark I did showed over a 2X in performance on LAM compared to
> MPICH1. I know MPICH1 is really old and we have a shiny new MPICH2, but
> you would be suprised how many people start with MPICH1 and how many
> people stick with it.
Do you have some anecdotal numbers for different MPI libraries over GigE?

> So, I'm not picking on Mark but I wanted to throw out some random observations
> I've made over the years. Not that I'm an expert but I've got a few CFD/cluster
> bruises and thought I would show people why I got them :)
> 
> Jeff
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-- 
Geoffrey D. Jacobs

Go to the Chinese Restaurant,
Order the Special