[Mpi3-rma] MPI-3 UNIFIED model clarification

[Jed Brown]

"Underwood, Keith D" <keith.d.underwood at intel.com> writes:

> Oh, I think we want it to say that they are identical.  I believe that
> is the only way to let the user actually use it.

Given that there is nothing the source rank can do to provide read
ordering at the target, in what scenario can this be useful?  If users
are specializing for UNIFIED and intend to elide the somewhat
heavyweight MPI_Win_sync, how can they avoid using their own memory
fences?  (I thought this was the use case that UNIFIED specialization
was intended for: the performance and "safety" of threads, localized to
a window.)
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