I am also a proponent of the multiple thread support. For many reasons:
 - code simplification
 - easier support of computation/communication overlap with fewer
synchronization points
 - possibility of creating exception aware MPI Code (I think the MPI
standard cruelly lacks constructs for a natural clean handling of
application exceptions across processes)

So it is good to hear there is progress.

On Feb 18, 2017 7:43 AM, "r...@open-mpi.org" <r...@open-mpi.org> wrote:

> We have been making a concerted effort to resolve outstanding issues as
> the interest in threaded applications has grown. It should be pretty good
> now, but we do see occasional bug reports, so it isn’t perfect.
>
> > On Feb 18, 2017, at 12:14 AM, Mark Dixon <m.c.di...@leeds.ac.uk> wrote:
> >
> > On Fri, 17 Feb 2017, r...@open-mpi.org wrote:
> >
> >> Depends on the version, but if you are using something in the v2.x
> range, you should be okay with just one installed version
> >
> > Thanks Ralph.
> >
> > How good is MPI_THREAD_MULTIPLE support these days and how far up the
> wishlist is it, please?
> >
> > We don't get many openmpi-specific queries from users but, other than
> core binding, it seems to be the thing we get asked about the most (I
> normally point those people at mvapich2 or intelmpi instead).
> >
> > Cheers,
> >
> > Mark
> > _______________________________________________
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> > users@lists.open-mpi.org
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>
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