Don't forget that there's a lot more to "binary portability" between MPI implementations than just the ABI (wire protocols, run-time interfaces, ...etc.). This is the main (set of) reasons that ABI standardization of the MPI specification never really took off -- so much would need to be standardized that it could (would) remove a lot of optimization / value-add that each MPI implementation (particularly those tuned for a specific environment) can do specifically because such things are *not* standardized.
I.e.: all things being equal, the optimization and performance benefits that are achieved by real-world MPI implementations have been deemed more important than binary compatibility. > On Sep 20, 2017, at 6:07 PM, Michael Thomadakis <drmichaelt7...@gmail.com> > wrote: > > This discussion started getting into an interesting question: ABI > standardization for portability by language. It makes sense to have ABI > standardization for portability of objects across environments. At the same > time it does mean that everyone follows the exact same recipe for low level > implementation details but there may be unnecessarily restrictive at times. > > On Wed, Sep 20, 2017 at 4:45 PM, Jeff Hammond <jeff.scie...@gmail.com> wrote: > > > On Wed, Sep 20, 2017 at 5:55 AM, Dave Love <dave.l...@manchester.ac.uk> wrote: > Jeff Hammond <jeff.scie...@gmail.com> writes: > > > Please separate C and C++ here. C has a standard ABI. C++ doesn't. > > > > Jeff > > [For some value of "standard".] I've said the same about C++, but the > current GCC manual says its C++ ABI is "industry standard", and at least > Intel document compatibility with recent GCC on GNU/Linux. It's > standard enough to have changed for C++11 (?), with resulting grief in > package repos, for instance. > > I may have used imprecise language. As a matter of practice, I switch C > compilers all the time without recompiling MPI and life is good. Switching > between Clang with libc++ and GCC with libstd++ does not produce happiness. > > Jeff > > -- > Jeff Hammond > jeff.scie...@gmail.com > http://jeffhammond.github.io/ > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users > > _______________________________________________ > users mailing list > users@lists.open-mpi.org > https://lists.open-mpi.org/mailman/listinfo/users -- Jeff Squyres jsquy...@cisco.com _______________________________________________ users mailing list users@lists.open-mpi.org https://lists.open-mpi.org/mailman/listinfo/users
