[Mauiusers] Fairshare -- Explanation

Philip Peartree P.Peartree at postgrad.manchester.ac.uk
Sat Jul 18 10:12:36 MDT 2009

Thanks to all that replied, I will try this suggestion here, is there  
any where I can get an explanation of fairshare though, I don't really  
understand how it affects the priority of the jobs yet!

Quoting Lennart Karlsson <Lennart.Karlsson at nsc.liu.se>:

> 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?
> Phil,
> 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.
> Cheers,
> -- Lennart Karlsson <Lennart.Karlsson at nsc.liu.se>
>    National Supercomputer Centre in Linkoping, Sweden
>    http://www.nsc.liu.se
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