Difference: BatchSystem (9 vs. 10)

Revision 102013-05-21 - AndrewPickford

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Batch System

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  The priority of a job is the sum of several weighting factors.
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  • There is a constant weighting given to short jobs and smaller weighting given to medium and long jobs. So that if all other factors are equal short job will have priority.
  • The primary weighting is user fairshare. As a users jobs run their usage increases and the priority of their queued jobs decreases. This is balanced so that a user who uses exactly their fairshare allotment (currently 20% of the cpu averaged over the previous week) will have their medium job priority decreased such that the medium job priority is equal to someone elses vlong job priority who has not used the batch system in the previous week.
  • A waiting jobs priority slowly increases as a function of time waiting in the queue. Currently a vlong job would have to wait several weeks to match the priority of a medium queue job all other things being equal.
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  • There is a constant weighting given to short jobs and smaller weighting given to medium and long jobs. So that if all other factors are equal short jobs will have priority.
  • The primary weighting is user fairshare. As a users jobs run their usage increases and the priority of their queued jobs decreases. This is balanced so that a user who uses exactly their fairshare allotment (currently 20% of the cpu averaged over the previous 48 days) will have their medium job priority decreased such that the medium job priority is equal to someone else's vlong job priority who has not used the batch system in the previous 48 days.
  • Waiting jobs priority slowly increases as a function of time waiting in the queue. Currently a vlong job would have to wait several weeks to match the priority of a medium queue job all other things being equal.
 

-- AndrewPickford - 12 Jan 2009 \ No newline at end of file

 
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