[Mauiusers] Fairshare -- Explanation
Lennart.Karlsson at nsc.liu.se
Sat Jul 18 01:47:51 MDT 2009
P.Peartree at postgrad.manchester.ac.uk said:
> This may not be the place for this, but I can't fathom it myself. I'm
> trying to implement fairshare on a cluster, currently we have 5
> execution queues and a routing queue set up in torque, the queues are
> prioritised starting from 50 down to 10. What I want to do is prevent
> any user from using more than their fair percentage of the cluster
> (i.e. time averaged over, say a week, that each user is entitled to
> 1/total users of that time) This is to prevent a recurring problem
> where users load up the queue with lots of jobs and thus prevent other
> users from using the cluster. I don't know if fairshare is the best
> way to do it, or quite how to set up the policy. Could anyone offer
> any guidance?
I presume that you today give queue priority mostly from time in queue.
My proposal is that you set a limit on the number of jobs per user that
gets queue time priority added, with a MAXIJOB declaration, e.g.
That is the most straightforward solution to your queue stuffing
problem. Even if a user submits 5000 jobs, only ten of them will
compete with other jobs on your system. On one of our systems, we
have set MAXIJOB as low as two.
-- Lennart Karlsson <Lennart.Karlsson at nsc.liu.se>
National Supercomputer Centre in Linkoping, Sweden
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