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Subject: Re: [OMPI users] How to time data transfers?
From: Michael E. Thomadakis (miket7777_at_[hidden])
Date: 2010-10-13 16:52:02


  On 10/13/10 13:23, Eugene Loh wrote:
> Ed Peddycoart wrote:
>>
>> I need to do some performance tests on my mpi app. I simply want to
>> determine how long it takes for my sends from one process to be
>> received by another process.
>>
>> That should work once the code is corrected. Can you use
>> MPI_Wtime()? (Not necessarily a big deal, but should be a portable
>> way of getting high-quality timings in MPI programs.) In what sense
>> does it not capture the complete time?
>
[ .. ]

Does MPI_Wtime of OMPI 1.4.3/1.5.0 rely on high resolution clocks (for
Linux) or does still rely on gettimeofday() ? How would one request at
OMPI built time to let it use high resolution clocks?

thanks ...

Michael
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