[mvapich-discuss] Tracking progress MPI_Reduce operation

[Filippo Spiga]

On Sep 17, 2014, at 2:07 AM, Hari Subramoni <subramoni.1 at osu.edu> wrote:
> Currently there are no environment variables or compile time options that allows you to track the progress of a collective in MVAPICH2. Could you please let us know what the use case here is?

I have no clue exactly which version the user is using and I haven't seen the code yet, the user approached user support raising an issue to the code and pointing to a possible MPi_Reduce misbehavior, everything is still to be confirmed. What I know is that the user is allocating the receiving buffer on all MPI processors involved in the reduction (in this case MPI_COMM_WORLD) and the array of data is something relatively small, order of few kilobytes. I will probably filter all possible problems related to his code by myself before point to MPI. So I've just anticipated this question because he ask me.

Cheers,
Filippo

--
Mr. Filippo SPIGA, M.Sc.
http://filippospiga.info ~ skype: filippo.spiga

«Nobody will drive us out of Cantor's paradise.» ~ David Hilbert

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