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Subject: [OMPI users] Hooks for Collective's sync/transfer activity?
From: Manfred Muecke (manfred.muecke_at_[hidden])
Date: 2009-08-12 10:11:25

Hello *,

I would like to understand in more detail how much time some collective
communication calls really spend waiting for the last process to enter. I
know this can be done by logging entry times for each process, but I
wonder if there is a better and more efficient way.

The peruse interface allows exactly that for send/recv communication (see Unfortunately
the current peruse specification
( does not cover
collectives (but mentions them explicitly for future extensions).

Does anyone know if there is a plan to go ahead with MPI peruse for
collectives (in general and specifically in OpenMPI)?

Are there hooks in the OpenMPI collective's code which could be used to
hand-wire similar functionality?

Thanks, Manfred

Manfred Mücke               
Research Lab Computational Technologies and Applications