[Mpi-forum] MPI One-Sided Communication
atchley at myri.com
Fri Apr 24 08:39:34 CDT 2009
On Apr 24, 2009, at 8:38 AM, Jeff Hammond wrote:
> Active messages are very appealing to me but I'm not aware of a
> library implementation (F77 and C compatible) that runs on BlueGene/P,
> Cray XT, Infiniband and Myrinet. Can you point me to one?
MX does support a limited active message model. The application can
register an unexpected handler that is called whenever MX receives a
message for which the application has not pre-posted a receive. The
handler has access to the match tag, the sender info, the length of
the message, and the actual data if the length is 1 KB or less (small
It is useful in filesystems where there are a lot of unexpected
messages. It avoids having to pre-post a lot of generic receives.
I believe Open-MX supports it as well.
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