[Beowulf] Measuring port to port latency

[Douglas Eadline]

The benchmarks mentioned in the other responses are a
good place to start. However, these single port numbers
don't tell the whole story with multi-core where you may
have eight cores on a node all talking to other nodes at
the same time.

Multi-core requires thinking differently about performance.
Talking about single application performance in a multi-core
environment is like believing that all you need is a good
quarterback to have a winning football team (apologies to
all the non-US football fans)

 --
 Doug


> Hi,
>
> since the rush of emails seems to be over right now, I would like to
> start another thread. How are you measuring port to port latency in your
> network easily?
>
> So far, I have found a small MPI-pingpong code at
>
> http://cluster.fisica.unam.mx/curso/mpi_intro/para_pingpong.html
>
> as well as netpipe at
>
> http://www.scl.ameslab.gov/Projects/Netpipe/
>
> They look fine on their own, but since I'm just starting, any opinions?
>
> Cheers
>
> Carsten
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--
Doug