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Subject: Re: [OMPI users] kernel 2.6.23 vs 2.6.24 - communication/wait times
From: Rainer Keller (keller_at_[hidden])
Date: 2010-04-01 13:49:23


Hello,

On Thursday 01 April 2010 12:16:25 pm Oliver Geisler wrote:
> Does anyone know a benchmark program, I could use for testing?
There's an abundance of benchmarks (IMB, netpipe, SkaMPI...) and performance
analysis tools (Scalasca, Vampir, Paraver, Opt, Jumpshot).

However, reading through your initial description on Tuesday, none of these
fit: You want to actually measure the kernel time on TCP communication costs.

So, have You tried attaching "strace -c -f -p PID" to the actual application
processes?

As a starter You may invoke the benchmark using:
   mpirun -np 4 strace -c -f ./benchmark
(which however includes initialization and all other system calls)...

Hope this helps.

Best regards,
Rainer

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Rainer Keller, PhD                  Tel: +1 (865) 241-6293
Oak Ridge National Lab          Fax: +1 (865) 241-4811
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