[Pkg-openmpi-maintainers] preferred MPI: openmpi or mpich?

[Drew Parsons]

On Fri, 2017-07-07 at 11:47 +0200, Michael Banck wrote:
> Hi,
> 
> We (Debichem) also have a few upstreams that claim OpenMPI is more
> buggy
> than MPICH.

Interesting.  Can you check in with them to see whether they still
think that's the case, or was that poor experience with older OpenMPI
versions?

> 
> On Fri, Jul 07, 2017 at 09:22:52AM +0100, Alastair McKinstry wrote:
> > The bigger question here is : how do we decide between them?
> 
> How about we have both, at least for the core linear algebra
> packages,
> like scalapack etc.?


I think that could be a good policy regardless of our choice of Debian
default MPI.  

We need to upgrade scalapack, so it's a good time to make that kind of
packaging change. We already have libscalapack-openmpi1.  We'd rename 
libscalapack-mpi-dev as libscalapack-openmpi-dev and make 
libscalapack-mpi-dev a dummy package that depends on it (or on the mpi-
default version).  Then alongside we'd create libscalapack-mpich-dev
and libscalapack-mpich1

Drew