[Re-sending from a subscribed address, apologies for any duplicates.]
Dominik 'Rathann' Mierzejewski dominik@greysector.net 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@lists.open-mpi.org/msg00119.html
I guess you haven't tried it :-/. 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.
I wish there was an MPI one could be happy with, providing the flexibility of OMPI without the maintenance issues.