Difference: BatchSystem (6 vs. 7)

Revision 72012-01-18 - AndrewPickford

Line: 1 to 1
 
META TOPICPARENT name="WebHome"

Batch System

Line: 64 to 64
  where short5 is the default queue and Walltime is the maximum walltime allowed on each queue.
Added:
>
>
While it is possible to view your own jobs with qstat, the command will not display all jobs. To display all jobs use the Maui client command showq

To see the current priorities of waiting jobs use the command showq -i.

Job Pre-emption

 Jobs in the vlong4 and vlong5 queues can be preempted by jobs waiting in the short4, short5, medium4 or medium5 queues. A preempted job is placed in the suspended state - it remains in memory but is not longer being executed. Once the preempting job has finished the preempted job starts executing again.
Changed:
<
<
While it is possible to view your own jobs with qstat, the command will not display all jobs. To display all jobs use the Maui client command showq
>
>

Job Priority

The priority of a job is the sum of several weighting factors.

  • 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.
 

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

 
This site is powered by the TWiki collaboration platform Powered by PerlCopyright © 2008-2022 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
Ideas, requests, problems regarding TWiki? Send feedback