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Subject: Re: [OMPI users] shm unlinking
From: Rushton Martin (JMRUSHTON_at_[hidden])
Date: 2011-04-14 09:22:14


Thanks for the response. In the last 5 minutes I have managed to get
some output from the prologue.parallel scripts, it turns out that the
Torque Administrator's Manual was wrong, and I was fool enough to
believe it! Now that I've got a working model I can start to sort out
the mess with psm_shm files.

For your information: we were supplied with a script when we bought the
cluster, but the original script made the assumption that all processes
and shm files belonging to a specific user ought to be deleted. This is
a problem if users submit jobs which only half fill a node and the
second job starts on the same node as the first one. The first job to
finish causes the continuing job to stop dead. We therefore had to
disable any cleanup to allow jobs to run. Now we are finding a slow
fill up with the shm files and I need to do something; at least now I
have a way forward.

Martin Rushton
HPC System Manager, Weapons Technologies
Tel: 01959 514777, Mobile: 07939 219057
email: jmrushton_at_[hidden]
www.QinetiQ.com
QinetiQ - Delivering customer-focused solutions

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