Re: [Scitech] Re: openmpi 3.1.3?

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On Thursday, 14 February 2019 at 11:11, Dave Love wrote:
> [Re-sending from a subscribed address, apologies for any duplicates.]
> 
> Dominik 'Rathann' Mierzejewski <dominik@xxxxxxxxxxxxxx> writes:
> 
> > Why not 4.0.0? It was released in September 2018 and it's supposedly ABI
> > compatible with 3.x:
> > https://www.mail-archive.com/announce@xxxxxxxxxxxxxxxxxx/msg00119.html
> 
> I guess you haven't tried it :-/.

Indeed, I haven't.

> It may be ABI compatible, but it's
> not API compatible (at least by default); that's apart from the usual
> sort of breakage you expect from a major version.  I've wasted too much
> time on it, and given up locally for now.

Understood. I guess the way forward is to update to latest 3.1.x now
and start working on 4.0.0 after F30 is branched in COPR. I might be
able to lend a hand or two. ;)

> I wish there was an MPI one could be happy with, providing the
> flexibility of OMPI without the maintenance issues.

Seconded. For example, there are subtle differences between MPICH and
OpenMPI regarding MPI_OFFSET_KIND int type on 32bit arches and neither
upstream considered changing to be consistent with the other:
https://github.com/open-mpi/ompi/issues/4846
https://github.com/pmodels/mpich/issues/3002

I'm sure there are other pitfalls as well.

Regards,
Dominik
-- 
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