Open MPI logo

Open MPI User's Mailing List Archives

  |   Home   |   Support   |   FAQ   |   all Open MPI User's mailing list

Subject: Re: [OMPI users] MPI_Reduce performance
From: Terry Frankcombe (terry_at_[hidden])
Date: 2010-09-08 21:52:34


Can you clarify... those timings are what is reported for the reduction
call specifically, not the total execution time?

If so, then the difference is, to a first approximation, the time you
spend sitting idly by doing absolutely nothing waiting at the barrier.


Dr. Terry Frankcombe
Research School of Chemistry, Australian National University
Ph: (+61) 0417 163 509    Skype: terry.frankcombe