[Trillian-users] Trillian PBS

[Jimmy Raeder]

As many of you have noticed, the Trillian PBS batch system has had issues lately, such that jobs got stuck in the input queue despite there being enough nodes available.

Unfortunately, we have not been able to pinpoint the cause.  In addition, we no longer subscribe to Cray support, so any help they give us will come with a cost.  We have an open ticket w/Cray now, and hopefully the issue will be resolved soon.

In the mean time, the only remedy to free the stuck nodes is a reboot, which will kill any jobs that are still running.  This requires a compromise, since waiting for active jobs to finish can leave large portions of the machine unusable for a long time.

For the time being, we will employ the policy that we will not wait for jobs to finish if they already run for more than 3 days.  In other words, if you run jobs longer than 3 days they are at risk of being terminated.  It is thus advised to rather use   more nodes and shorter runtimes.  Please note that most computing centers limit wall clock time to 1-2 days typically, because long running jobs make it much harder to manage the machine properly.

—  Jimmy Raeder

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Joachim (Jimmy) Raeder
Professor of Physics, Department of Physics & Space Science Center
University of New Hampshire
245G Morse Hall, 8 College Rd, Durham, NH 03824-3525
voice: 603-862-3412  mobile: 603-502-9505  assistant: 603-862-1431
e-mail: J.Raeder at unh.edu
WWW: http://mhd.sr.unh.edu/~jraeder/tmp.homepage
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