[Beowulf] How to configure a cluster network

Greg Lindahl lindahl at pbm.com
Thu Jul 24 20:18:38 EDT 2008


On Thu, Jul 24, 2008 at 08:14:43PM +0200, Jan Heichler wrote:

> 1) most applications are latency driven - not bandwidth driven.

As a guy who's a big fan of low latency, I had to say that this is not
a good generalization. Some apps become latency or message-rate
sensitive if you scale to enough nodes at a fixed problem size. But
most of the time, if you're running an app that is scaling really well
on your network, it's neither bandwidth or latency bound. It's cpu
bound.

As another by the way (not directed at you, Jan), fat trees and Clos
networks are not the same.

-- greg


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