[Beowulf] choosing a high-speed interconnect
cnsidero at syr.edu
Tue Oct 12 14:13:46 PDT 2004
On Tue, 2004-10-12 at 16:48, Joe Landman wrote:
> First questions first:
> Why do you think you need a faster network, and what aspect of fast do
> you think you need? Low latency? High bandwidth?
To tell you the truth I can't answer that with more than, "I have a
gut feeling". I am in the process of profiling the performance of our
current cluster with our programs. Any suggestions ???
> What codes are you running? Across how many CPUS? Have you done a
> performance analysis on your system to observe "slow" runs in progress,
> and are you convinced that the network is the issue?
We run exclusively computation fluid dynamics on it. One program is
Fluent the other is an in-house turbo-machinery code. My experiences so
far have led me to believe Fluent is much more sensitive to the
network's performance than the in-house program. Thus my inquiry into a
higher performance network.
> We have done lots of tuning bits for customers where the issues wound up
> being something else than what they had thought. It is worth at least
> looking into for your code/problems, and identifying the bottleneck (if
> you haven't already done so).
Do you have more information on this 'tuning for customers'. I am
interested in your results. Again any suggestions on how to go about
this are welcomed.
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