Hi Alastair, On Thu, Mar 11, 2021 at 04:44:05PM +0000, Alastair McKinstry wrote: > See the mail below from the OpenMPI maintainers. > > This would mean our options are: > (1) Drop MPI for 32-bit archs. > > (2) Use MPICH for 32-bit archs, OpenMPI for 64 bit > > (3) Use MPICH for everything. > > My experience is that OpenMPI is more mature for new fabrics, etc (UCX) - > I wasn't able to get UCX to work with MPICH in time for Bullseye, so I'm > not favouring (3). I'd rather not drop MPI for 32-bit systems in general > - while I don't expect proper HPC to run on these, its one of the simplest > ways of adding parallelism, and there will be systems with large numbers > of 32-bit cores.
We're just talking about defaults here, right? I think if we switch the default to MPICH but make it reasonably easy for someone to switch to OpenMPI, then that's good enough. Alternatively, option 2 (so long as we're only talking about defaults) is fine too. Dropping MPI for any architecture that we otherwise fully support seems inappropriate. -- To the thief who stole my anti-depressants: I hope you're happy -- seen somewhere on the Internet on a photo of a billboard
