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Subject: Re: [OMPI users] profile the performance of a MPI code: how much traffic is being generated?
From: Eugene Loh (Eugene.Loh_at_[hidden])
Date: 2009-09-29 11:40:30


If MPE and Vampir represent the class of tools you're interested in,
there is a performance-tool FAQ at
http://www.open-mpi.org/faq/?category=perftools listing some other tools
in this class.

Note that these are really postmortem tools. That is, you typically run
the code first and then look at results later. In certain cases, you
can start looking at results while the job is still running, but mostly
these tools are built to do postmortem analysis.

That may still work for you. E.g., Sun Studio Analyzer (which happens
to be the only one of the tools I know well) allows you to look at
in-flight messages or bytes -- either in general or for a specific
connection.

But I'm guessing these are indirect ways of looking at what you really
want to know. It sounds like you want to be able to watch some %
utilization of a hardware interface as the program is running. I
*think* these tools (the ones on the FAQ, including MPE, Vampir, and Sun
Studio) are not of that class.

But maybe the indirect, postmortem methods suffice. You decide.

Matthieu Brucher wrote:

>You can try MPE (free) or Vampir (not free, but can be integrated
>inside OpenMPI).
>
>2009/9/29 Rahul Nabar <rpnabar_at_[hidden]>:
>
>
>>I have a code that seems to run about 40% faster when I bond together
>>twin eth interfaces. The question, of course, arises: is it really
>>producing so much traffic to keep twin 1 Gig eth interfaces busy? I
>>don't really believe this but need a way to check.
>>
>>What are good tools to monitior the MPI performance of a running job.
>>Basically what throughput loads is it imposing on the eth interfaces.
>>Any suggestions?
>>
>>The code does not seem to produce much of disk I/O as profiled via
>>strace (if at all NFS I/O is a bottleneck).
>>
>>