On Sat, Feb 13, 2016 at 2:27 PM, Nick Papior <nickpap...@gmail.com> wrote:
> > > 2016-02-13 23:07 GMT+01:00 Kim Walisch <kim.wali...@gmail.com>: > >> Hi, >> >> > You may be interested in reading: >> https://www.open-mpi.org/software/ompi/versions/ >> >> Thanks for your answer. I found: >> >> > Specifically: v1.10.x is not guaranteed to be backwards >> compatible with other v1.x releases. >> >> And: >> >> > However, this definition only applies when the same version of Open >> MPI is used with all instances ... If the versions are not exactly the >> same everywhere, Open MPI is not guaranteed to work properly in any >> scenario. >> >> So statically linking against Open MPI seems to be a bad idea. >> >> What about linking against a rather old shared Open MPI library >> from e.g. 3 years ago? Will my program likely run on most systems >> which have a more recent Open MPI version installed? >> > Most probably this will rarely work. If it does, you are lucky... :) > The link still applies. As it says, if it works it works, if not you have > to do something else. > >> >> Or is it better to not distribute any binaries which link against Open MPI >> and instead put compilation instructions on the website? >> > Yes, and/or provide serial equivalents of your program. > Besides, providing binaries for specific MPI-implementations may seem like > easing it for users, however in my experience many users do not know that > MPI is implementation specific, i.e. OpenMPI and MPICH and hence they will > subsequently ask why it doesn't work using an intel-suite of compilers (for > instance). > >> >> You can rely upon e.g. https://www.mpich.org/abi/ when redistributing MPI binaries built with MPICH, but a better option would be to wrap all of your MPI code in an implementation-agnostic wrapper and then ship a binary that can dlopen a different version wrapper depending on which MPI implementation the user has. That would allow you to ship a single binary that could use both MPICH and OpenMPI. Jeff > Thanks, >> Kim >> >> On Sat, Feb 13, 2016 at 10:45 PM, Nick Papior <nickpap...@gmail.com> >> wrote: >> >>> You may be interested in reading: >>> https://www.open-mpi.org/software/ompi/versions/ >>> >>> 2016-02-13 22:30 GMT+01:00 Kim Walisch <kim.wali...@gmail.com>: >>> >>>> Hi, >>>> >>>> In order to make life of my users easier I have built a fully >>>> statically linked version of my primecount program. So the program >>>> also statically links against Open MPI. I have built this binary on >>>> CentOS-7-x86_64 using gcc. The good news is that the binary runs >>>> without any issues on Ubuntu 15.10 x64 (uses mpiexec (OpenRTE) 1.10.2). >>>> >>>> The bad news is that the binary does not work on Ubuntu 14.04 x64 >>>> which uses mpiexec (OpenRTE) 1.6.5. Here is the error message: >>>> >>>> >>>> $ mpirun -n 1 ./primecount 1e10 -t1 >>>> [ip-XXX:02671] [[8243,0],0] mca_oob_tcp_recv_handler: invalid message >>>> type: 15 >>>> >>>> -------------------------------------------------------------------------- >>>> mpirun noticed that the job aborted, but has no info as to the process >>>> that caused that situation. >>>> >>>> -------------------------------------------------------------------------- >>>> ubuntu@ip-XXX:~$ mpiexec --version >>>> mpiexec (OpenRTE) 1.6.5 >>>> >>>> >>>> Questions: >>>> >>>> 1) Is this backwards incompatibility issue an Open MPI bug? >>>> >>>> 2) Can I expect that my binary will work with future mpiexec >>>> versions >= 1.10 (which it was built with)? >>>> >>>> Thanks and best regards, >>>> Kim >>>> >>>> _______________________________________________ >>>> users mailing list >>>> us...@open-mpi.org >>>> Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users >>>> Link to this post: >>>> http://www.open-mpi.org/community/lists/users/2016/02/28522.php >>>> >>> >>> >>> >>> -- >>> Kind regards Nick >>> >> >> > > > -- > Kind regards Nick > > _______________________________________________ > users mailing list > us...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/users > Link to this post: > http://www.open-mpi.org/community/lists/users/2016/02/28525.php > -- Jeff Hammond jeff.scie...@gmail.com http://jeffhammond.github.io/
