On 11/29/20 7:45 PM, Gilles Gouaillardet wrote: > Aisha, > > yes, you can install multiple Open MPI implementations in parallel, > simply use a different prefix when running configure. > > Newer versions of Open MPI support the latest MPI standard Makes sense :D > (there is > not a direct link between an Open MPI version > and the MPI standard version though). Do all OpenMPI major versions support the latest standard? That would simplify things a lot :D > That being said, with the exception of a few removed/deprecated > subroutines, a given version of the MPI standard is a superset of the > previous versions. > This is at the source level, and Open MPI does not generally guarantee > ABI compatibility between two major versions. Makes sense too. I was not expecting ABI compatibility between major versions. > Last but not least, keep in mind several packages depend on MPI, for > example mpi4py (python bindings), parallel FFTW (Fast Fourier > Transformations), parallel hdf5/netcdf (I/O). > So since Open MPI has generally no ABI compatibility between major > versions, you would also need multiple versions of the dependents > packages (one per Open MPI version). Yes, I am aware that we would need multiple "slots" for each dependent packages. We have a half finished project that was started a couple of years ago which does this slotting of packages and MPI implementations.
Thanks a lot for the answers. The unfortunate reality is that the default MPI pakages are badly managed in almost all operating systems and any decent cluster has a sysadmin who cooks up a solution for their use case :( Even users who want to use OpenMPI, most of the times, install it manually to tune and get a better control over it. Making the default packages saner at the operating system level should hopefully help a lot of people. Best, Aisha > Cheers, > > Gilles > > On Mon, Nov 30, 2020 at 6:00 AM Aisha Tammy via ompi-packagers > <ompi-packagers@lists.open-mpi.org> wrote: >> Hi, >> I am a package manager for Gentoo Linux and we are currently trying >> to get better MPI support for our package tree. >> >> A curious question was whether it was possible to have multiple OpenMPI >> implementations installed in parallel? >> There seem to be multiple OpenMPI versions being supported and presumably >> they are supporting different standards of MPI - 2, 3, 3.1 ? >> >> Am I correct in making this assumption? >> If so, it should be possible to allow multiple OpenMPI versions together. >> >> Thanks a lot, >> Aisha >> >> _______________________________________________ >> ompi-packagers mailing list >> ompi-packagers@lists.open-mpi.org >> https://rfd.newmexicoconsortium.org/mailman/listinfo/ompi-packagers > _______________________________________________ > ompi-packagers mailing list > ompi-packagers@lists.open-mpi.org > https://rfd.newmexicoconsortium.org/mailman/listinfo/ompi-packagers
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