Re: Fwd: Dropping Open MPI 32 bit support
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
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