Isn't this supposed to be part of cluster 101? I would rather add it to our faq, maybe in a slightly more generic way (not only focused towards 'ulimit - c'. Otherwise we will be bound to define what is forwarded and what is not, and potentially creates chaos for knowledgeable users (that know how to deal with these issues).
George On Mar 3, 2017 3:05 AM, "Gilles Gouaillardet" <gil...@rist.or.jp> wrote: Folks, this is a follow-up on https://www.mail-archive.com/u s...@lists.open-mpi.org//msg30715.html on my cluster, the core file size is 0 by default, but it can be set to unlimited by any user. i think this is a pretty common default. $ ulimit -c 0 $ bash -c 'ulimit -c' 0 $ mpirun -np 1 bash -c 'ulimit -c' 0 $ mpirun -np 1 --host n1 bash -c 'ulimit -c' 0 $ ssh n1 [n1 ~]$ ulimit -c 0 [n1 ~]$ bash -c 'ulimit -c' 0 *but* $ ssh motomachi-n1 bash -c 'ulimit -c' unlimited now if i manually set the core file size to unlimited $ ulimit -c unlimited $ ulimit -c unlimited $ bash -c 'ulimit -c' unlimited $ mpirun -np 1 bash -c 'ulimit -c' unlimited *but* $ mpirun -np 1 --host n1 bash -c 'ulimit -c' 0 fun fact $ ssh n1 bash -c 'ulimit -c; bash -c "ulimit -c"' unlimited 0 bottom line, MPI tasks that run on the same node mpirun was invoked on inherit the core file size limit from mpirun, whereas tasks that run on the other node use the default core file size limit. a manual workaround is mpirun --mca opal_set_max_sys_limits core:unlimited ... i guess we should do something about that, but what - just document it - mpirun forwards all/some limits to all the spawned tasks regardless where they run - mpirun forwards all/some limits to all the spawned tasks regardless where they run but only if they are 0 or unlimited - something else thoughts anyone ? Gilles _______________________________________________ devel mailing list devel@lists.open-mpi.org https://rfd.newmexicoconsortium.org/mailman/listinfo/devel
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