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George March 25, 2005 06:54

cluster - parallel speedup

I'm looking for experience of somebody who is using Fluent on a cluster made of PCs, connected by fast Ethernet. Can you say what is the lower limiting size of problem in terms of speedup when splitting a simulation between nodes?

On a 64-bit computing server with shared memory one has almost linear increase in computing speed when the simulation is split among processors. But on a cluster, when the size of the problem is relatively small, the network traffic would soon become a bottleneck of further speedup if splitting the simulation on more processors.

Have you this experience and can you tell us what's the limit in your system?



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