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Subject: Re: [OMPI devel] Simple program (103 lines) makes Open-1.4.3 hang
From: Eugene Loh (eugene.loh_at_[hidden])
Date: 2010-11-23 17:52:06


George Bosilca wrote:

>Moreover, eager send can improve performance if and only if the matching receives are already posted on the peer. If not, the data will become unexpected, and there will be one additional memcpy.
>
I don't think the first sentence is strictly true. There is a cost
associated with eager messages, but whether there is an overall
improvement or not depends on lots of factors.