[torqueusers] File descriptor limits with mpiexec and pbs/torque

Maestas, Christopher Daniel cdmaest at sandia.gov
Wed Nov 3 13:59:47 MST 2004


Hello,

We recently discovered when launching > 504 processes on a system you
hit a file descriptor limit.
If you add the following to the startup script of your pbs_mom:
----
ulimit -n 4096
----

And ensure that the fs.file-max parameter is high enough in sysctl.conf
---
fs.file-max = 65536
---

You can launch job sizes > 504.  This is tested with torque 1.1.0p4 and
mpiexec-0.77 ....
We modified the pbs_mom startup script from a modified Nico rpm for
1.1.0p4. :-)

-- Chris
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