Looking at the Open MPI 1.10.0 man page: https://www.open-mpi.org/doc/v1.10/man1/mpirun.1.php
it looks like perhaps -oversubscribe (which was an option) is now the default behavior. Instead we have: *-nooversubscribe, --nooversubscribe*Do not oversubscribe any nodes; error (without starting any processes) if the requested number of processes would cause oversubscription. This option implicitly sets "max_slots" equal to the "slots" value for each node. It also looks like -map-by has a way to implement it as well (see man page). Thanks for letting me/us know about this. On a system of mine I sort of depend on the -nooversubscribe behavior! Matt On Tue, Sep 15, 2015 at 11:17 AM, Patrick Begou < patrick.be...@legi.grenoble-inp.fr> wrote: > Hi, > > I'm runing OpenMPI 1.10.0 built with Intel 2015 compilers on a Bullx > System. > I've some troubles with the bind-to core option when using cpuset. > If the cpuset is less than all the cores of a cpu (ex: 4 cores allowed on > a 8 cores cpus) OpenMPI 1.10.0 allows to overload these cores until the > maximum number of cores of the cpu. > With this config and because the cpuset only allows 4 cores, I can reach 2 > processes/core if I use: > > mpirun -np 8 --bind-to core my_application > > OpenMPI 1.7.3 doesn't show the problem with the same situation: > mpirun -np 8 --bind-to-core my_application > returns: > *A request was made to bind to that would result in binding more* > *processes than cpus on a resource* > and that's okay of course. > > > Is there a way to avoid this oveloading with OpenMPI 1.10.0 ? > > Thanks > > Patrick > > -- > =================================================================== > | Equipe M.O.S.T. | | > | Patrick BEGOU | mailto:patrick.be...@grenoble-inp.fr > <patrick.be...@grenoble-inp.fr> | > | LEGI | | > | BP 53 X | Tel 04 76 82 51 35 | > | 38041 GRENOBLE CEDEX | Fax 04 76 82 52 71 | > =================================================================== > > > _______________________________________________ > 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/2015/09/27575.php > -- Matt Thompson Man Among Men Fulcrum of History
