[Beowulf] evaluating FLOPS capacity of our cluster

Ashley Pittman ashley at pittman.co.uk
Mon May 11 18:06:59 EDT 2009


On Mon, 2009-05-11 at 15:09 -0400, Gus Correa wrote:
> Mark Hahn wrote:

> I haven't checked the Top500 list in detail,
> but I think you are right about 80% being fairly high.
> (For big clusters perhaps?).

Other way around, maintaining a high efficiency rating at large node
counts is a very difficult problem so larger clusters tend to have
smaller values.

> In the original email I mentioned that Roadrunner (top500 1st),
> has Rmax/Rpeak ~= 76%.
> 
> However, without any particular expertise or too much effort,
> I got 83.4% Rmax here. :)
> I was happy with that number,
> until somebody in the OpenMPI list told me that
> "anything below 85%" needs improvement.  :(

At 24 nodes that's probably a reasonable statement.

Ashley,

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