[Beowulf] Measuring port to port latency

[Kozin, I (Igor)]

Hi Carsten,
Netpipe is a good tool. It can give you raw latency i.e. without the MPI
overhead (you can use it with MPI as well). As for the MPI latency there
are many programs which can measure it. For example, Intel MPI Benchmark
(former PMB) has PingPong test
http://www.intel.com/cd/software/products/asmo-na/eng/cluster/clustertoo
lkit/219848.htm
The Network-Based Computing Laboratory at the Ohio State University used
to host a number of benchmarking programs including the latency test.
Unfortunately I do not have the link. I found that PathScale's link
checker (derived from an OSU benchmark) is very handy. Perhaps you can
find the link in the archive. Also check the archive on the issues with
measuring latency.
Best,
Igor 

-----Original Message-----
From: beowulf-bounces at beowulf.org [mailto:beowulf-bounces at beowulf.org]
On Behalf Of Carsten Aulbert
Sent: 20 September 2007 12:12
To: Beowulf Mailing List
Subject: [Beowulf] Measuring port to port latency

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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