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Subject: Re: [OMPI users] Progress in MPI_Win_unlock
From: Dave Goodell (goodell_at_[hidden])
Date: 2010-02-04 12:07:53


On Feb 3, 2010, at 6:24 PM, Dorian Krause wrote:

> Unless it is also specified that a process must eventually exit with
> a call to MPI_Finalize (I couldn't find such a requirement),
> progress for RMA access to a passive server which does not
> participate actively in any MPI communication is not guaranteed,
> right?
> (Btw. mvapich2 has the same behavior in this regard)

For the finalize requirement, see MPI-2.2 page 291, lines 36-38:

------8<------
This routine cleans up all MPI state. Each process must call
MPI_FINALIZE before it exits. Unless there has been a call to
MPI_ABORT, each process must ensure that all pending nonblocking
communications are (locally) complete before calling MPI_FINALIZE.
------8<------

MPI is intentionally vague on progress issues and leaves lots of room
for implementation choices.

I'll let the Open MPI folks answer the questions about their
implementation.

-Dave