On Sep 9, 2010, at 4:31 PM, Ashley Pittman wrote:
>> What is the exact semantics of an asynchronous barrier,
>
> I'm not sure of the exact semantics but once you've got your head around the concept it's fairly simple to understand how to use it, you call MPI_IBarrier() and it gives you a handle you can test with MPI_Test() or block for with MPI_Wait(). The tricky part comes in how many times you can call MPI_IBarrier() on a communicator without waiting for the previous barriers to complete but I haven't been following the discussion on this one to know the specifics.
FWIW: here's a brief writeup of MPI_Ibarrier -
http://blogs.cisco.com/ciscotalk/performance/comments/ibarrier/
--
Jeff Squyres
jsquyres_at_[hidden]
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