Starting early in the 1.7 series, we began to bind procs by default to cores when -np <= 2, and to sockets if np > 2. Is it possible this is what you are seeing?
On Aug 21, 2014, at 12:45 PM, Andrej Prsa <aprs...@gmail.com> wrote: > Dear devels, > > I have been trying out 1.8.2rcs recently and found a show-stopping > problem on our cluster. Running any job with any number of processors > larger than 32 will always employ only 32 cores per node (our nodes > have 48 cores). We are seeing identical behavior with 1.8.2rc4, > 1.8.2rc2, and 1.8.1. Running identical programs shows no such issues > with version 1.6.5, where all 48 cores per node are working. While our > system is running torque/maui, the problem is evident by running mpirun > directly. > > I am attaching hwloc topology in case that helps -- I am aware of a > buggy bios code that trips hwloc, but I don't know if that might be an > issue or not. I am happy to help debugging if you can provide me with > guidance. > > Thanks, > Andrej > <cluster.output><cluster.tar.bz2>_______________________________________________ > devel mailing list > de...@open-mpi.org > Subscription: http://www.open-mpi.org/mailman/listinfo.cgi/devel > Link to this post: > http://www.open-mpi.org/community/lists/devel/2014/08/15676.php
