[Beowulf] Mutiple IB networks in one cluster

Lux, Jim (337C) james.p.lux at jpl.nasa.gov
Fri Jan 31 09:12:49 PST 2014

On Thu, Jan 30, 2014 at 5:33 PM, Prentice Bisbal <prentice.bisbal at rutgers.edu> wrote:
> IB has more than enough bandwidth for
> message-passing and I/O.

Bandwidth is not the only measure for performance. Latency and number of messages per unit of time that can be handled are others.
Especially the latter was the subject of a heated debate a few years ago on this list.


You mean a Beowulf cluster composed of machines scattered around the city with trucks carrying boxes of 1 TB disk drives between processor nodes may not be an optimum architecture for fine grained parallelism? This configuration has very, very high data rate and bandwidth, but latency isn't so hot.


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