[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.

Jim


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