NAME

       sge_priority - Sun Grid Engine job priorities

DESCRIPTION

       Sun  Grid  Engine  provide means for controlling job dispatch and run-time priorities. The
       dispatch priority indicates the importance of pending jobs compared with  each  other  and
       determines the order in which Sun Grid Engine dispatches jobs to queue instances. The run-
       time priority determines the CPU allocation that the operating system assigns to jobs.

   JOBS DISPATCH PRIORITY
       A job's dispatch priority is affected by a number of factors:

       •  the identity of the submitting user

       •  the project under which the job is submitted (or alternatively, the default project  of
          the submitting user)

       •  any resources requested by the job

       •  the job's submit time

       •  the job's initiation deadline time (if specified)

       •  the -p priority specified for the job (also known as the POSIX priority "pprio")

       The  effect  of each of these is governed by the overall policy setup, which is split into
       three top-level contributions.  Each of these  is  configured  through  the  sched_conf(5)
       parameters  weight_priority,  weight_ticket  and  weight_urgency.   These three parameters
       control to what degree POSIX priority, ticket policy, and urgency policy are in effect. To
       facilitate  interpretation,  the  raw  priorities  ("tckts"/"urg"/"ppri")  are  normalized
       ("ntckts"/"nurg"/"npprior") before they are used to  calculate  job  priorities  ("prio").
       Normalization maps each raw urgency/ticket/priority  value into a range between 0 and 1.

          npprior = normalized(ppri)
          nurg    = normalized(urg)
          ntckts  = normalized(tckts)

          prio    = weight_priority * pprio +
                    weight_urgency  * nurg +
                    weight_ticket   * ntckts

       The higher a job's priority value, the earlier it gets dispatched.

       The urgency policy defines an urgency value for each job. The urgency value

          urg     =  rrcontr + wtcontr + dlcontr

       consists   of   the  resource  requirement  contribution  ("rrcontr"),  the  waiting  time
       contribution ("wtcontr") and the deadline contribution ("dlcontr").

       The resource requirement contribution is adding up all resource requirements of a job into
       a single numeric value.

          rrcontr = Sum over all(hrr)

       with  an  "hrr"  for  each  hard  resource  request.   Depending  on the resource type two
       different methods are used to determine the value to be used for "hrr" here.  For  numeric
       type  resource  requests, the "hrr" represents how much of a resource a job requests (on a
       per-slot basis for pe jobs) and how "important" this resource is considered in  comparison
       to other resources. This is expressed by the formula:

          hrr      = rurg * assumed_slot_allocation * request

       where  the  resource's urgency value ("rurg") is as specified under urgency in complex(5),
       the job's assumed_slot_allocation represents the number of slots  supposedly  assigned  to
       the job, and the per-slot request is that which was specified using the -l qsub(1) option.
       For string type requests the formula is simply

          hrr      = "rurg"

       and directly assigns the resource urgency value as specified under urgency in complex(5).

       The waiting time contribution represents a weighted weighting time of the jobs

          wtcontr = waiting_time * weight_waiting_time

       with the waiting time in  seconds  and  the  weight_waiting_time  value  as  specified  in
       sched_conf(5).

       The  deadline  contribution  has  an  increasing  effect  as  jobs approach their deadline
       initiation time (see the -dl option in qsub(1)).  It is defined as  the  quotient  of  the
       weight_deadline  value  from  sched_conf(5)  and  the  (steadily  decreasing) free time in
       seconds until deadline initiation time

          dlcontr = weight_deadline / free_time

       or is set to 0 for non-deadline jobs.  After the deadline passes, the value is static  and
       equal to weight_deadline.

       The  ticket policy unites functional, override and share tree policies in the ticket value
       ("tckts"),   as   is   defined   as   the   sum   of   the    specific    ticket    values
       ("ftckt"/"otckt"/"stckt") for each sub-policy (functional, override, share):

           tckts = ftckt + otckt + stckt

       The  ticket  policies provide a broad range of means for influencing both job dispatch and
       runtime priorities on a per job, per user, per project, and per department basis. See  the
       Sun Grid Engine Installation and Administration Guide for details.

   JOB RUN-TIME PRIORITY
       The  run-time priority can be dynamically adjusted in order to meet the goals set with the
       ticket policy. Dynamic run-time priority adjustment can be turned off  (default)  globally
       using reprioritize_interval in sched_conf(5) If no dynamic run-time priority adjustment is
       done at a host level, the priority specification in queue_conf(5) is in effect.

       Note that urgency and POSIX priorities do NOT affect runtime priority.

SEE ALSO

       sge_intro(1), complex(5), qstat(1), qsub(1), sched_conf(5), sge_conf(5)  Sun  Grid  Engine
       Installation and Administration Guide

COPYRIGHT

       See sge_intro(1) for a full statement of rights and permissions.