[Beowulf] many cores and ib

Mark Hahn hahn at mcmaster.ca
Tue May 6 23:55:39 EDT 2008

> messages into one network message. For applications cases, sometimes it
> helps with performance and sometimes it does not. OSU have shown both

when would a program deliberately send such messages?  isn't it something
that the program should avoid in the first place?  does the MPI optimization
apply to messages that differ in source/dest rank and/or tag?
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