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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