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Subject: Re: [OMPI users] Question about Asynchronous collectives
From: Jeff Squyres (jsquyres_at_[hidden])
Date: 2010-09-23 11:03:55


On Sep 23, 2010, at 10:54 AM, Richard Treumann wrote:

> I do not agree with Jeff on this below. The Proc 1 case where the MPI_Waits are reversed simply requires the MPI implementation to make progress on both MPI_Ibcast operations in the first MPI_Wait. The second MPI_Wait call will simply find that the first MPI_Ibcast is already done. The second MPI_Wait call becomes, effectively, a query function.

Er -- yes, you're right. I was incorrectly thinking about overtaking issues -- but they don't apply here.

-- 
Jeff Squyres
jsquyres_at_[hidden]
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