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23.0 Preemption > Preemption tasks > Using owner preemption

Conventions

23.1.5 Using owner preemption

ClosedContext

Owner preemption allows jobs submitted by a reservation owner to preempt jobs submitted by other users (for more information, see Configuring and Managing Reservations).

Owner preemption is enabled with the OWNERPREEMPT reservation flag.

For information about PREEPMPTEE and PREEMPTOR flags, see Preemption flags

To enable owner preemption

  1. Make the following configurations to the moab.cfg file:
    1. Set GUARANTEEDPREEMPTION to TRUE. (This causes Moab to lock PREEMPTOR jobs until JOBRETRYTIME expires.)
    2. Make sure that JOBNODEMATCHPOLICY is not set to EXACTNODE, which is not currently supported for preemption (for more information, see Testing and troubleshooting preemption).
    3. Set the PREEMPTPOLICY type (for more information, see PREEMPTPOLICY types).
    4. Set the OWNERPREEMPT flag.

      5. Optionally, if you want the owner preemption to override any PREEMPTMINTIME settings for PREEMPTEE jobs, you can set the OWNERPREEMPTIGNOREMINTIME flag as well.

    5. Specify an owner.

      6. If the non-owner job does not have a RESTARTABLE or REQUEUEABLE flag set, the job will cancel.

    2. For example:

    GUARANTEEDPREEMPTION TRUE
PREEMPTPOLICY <policy>
 
SRCFG[myrez] FLAGS=OWNERPREEMPT HOSTLIST=node01
SRCFG[myrez] OWNER=USER:john
SRCFG[myrez] USERLIST=jane,john PERIOD=INFINITY
 
QOSCFG[test1] QFLAGS=PREEMPTEE JOBFLAGS=restartable MEMBERULIST=john PRIORITY=100
QOSCFG[test2] QFLAGS=PREEMPTOR MEMBERULIST=john PRIORITY=10000
  2. Submit a job to a user who is not the owner (in this example, jane).
    3. [jane@g06]$ echo sleep 600 | msub -l walltime=600 -l procs=64

    (Optional) Examine the following output for showq and checkjob for jane's job:

    Moab.1
[jane@g06]$ showq
 
active jobs------------------------
JOBID     USERNAME    STATE      PROCS      REMAINING     STARTTIME
Moab.1    jane        Running    64         00:09:57      Mon Nov 14 12:07:52
 
1 active job     64 of 64 processors in use by local jobs (100.00%)
                 1 of 1 nodes active (100.00%)
 
eligible jobs----------------------
JOBID     USERNAME    STATE      PROCS      WCLIMIT       QUEUETIME
 
0 eligible jobs
 
blocked jobs-----------------------
JOBID     USERNAME    STATE      PROCS      WCLIMIT       QUEUETIME
 
0 blocked jobs
 
Total job: 1
    root@g06]# checkjob Moab.1
job Moab.1
 
State: Running
Creds: user:jane group:jane
WallTime: 00:01:02 of 00:10:00
SubmitTime: Mon Nov 14 12:07:52
(Time Queued Total: 00:00:00 Eligible: 00:00:00)
 
StartTime: Mon Nov 14 12:07:52
Total Requested Tasks: 64
 
Req[0] TaskCount: 64 Partition: FLEXlm
NodeCount: 1
 
Allocated Nodes:
[node01:64]
 
 
IWD: /opt/native
SubmitDir: /opt/native
Executable: /opt/native/spool/moab.job.FoZfIU
 
StartCount: 1
Flags: GLOBALQUEUE,PROCSPECIFIED
StartPriority: 1
Reservation 'Moab.1' (-00:01:24 -> 00:08:36 Duration: 00:10:00)
  3. Now submit a job for the owner (in this example, john).
    4. [john@g06]$ echo sleep 600 | msub -l walltime=600 -l procs=50

    [john@g06]$ echo sleep 600 | msub -l walltime=600 -l procs=50

    (Optional) Examine the following output for showq and checkjob for john's job:

    Moab.2
[john@g06]$ showq
 
active jobs------------------------
JOBID     USERNAME    STATE      PROCS     REMAINING     STARTTIME
Moab.1    jane        Canceling  64        00:07:43      Mon Nov 14 12:07:52
Moab.2    john        Running    50        00:09:59      Mon Nov 14 12:10:08
 
2 active jobs    64 of 64 processors in use by local jobs (100.00%)
                 1 of 1 nodes active (100.00%)
 
eligible jobs----------------------
JOBID     USERNAME    STATE     PROCS      WCLIMIT       QUEUETIME
 
0 eligible jobs
 
blocked jobs-----------------------
JOBID     USERNAME    STATE     PROCS      WCLIMIT       QUEUETIME
 
0 blocked jobs
 
Total jobs: 2

    Note that jane's job is canceled once john's job is submitted.

    [john@g06]$ checkjob Moab.2
job Moab.2
 
State: Running
Creds: user:john group:john
WallTime: 00:00:31 of 00:10:00
SubmitTime: Mon Nov 14 12:10:08
(Time Queued Total: 00:00:00 Eligible: 00:00:00)
 
StartTime: Mon Nov 14 12:10:08
Total Requested Tasks: 50
 
Req[0] TaskCount: 50 Partition: FLEXlm
NodeCount: 1
 
Allocated Nodes:
[node01:50]
 
 
IWD: /opt/native
SubmitDir: /opt/native
Executable: /opt/native/spool/moab.job.jf1N4a
 
StartCount: 1
Flags: HASPREEMPTED,GLOBALQUEUE,PROCSPECIFIED
StartPriority: 1
Reservation 'Moab.2' (-00:00:48 -> 00:09:12 Duration: 00:10:00)

    Note the new HASPREEMPTED flag.

    (Optional) Now look at the showq for jane's job (after):

    [root@g06]# checkjob Moab.1
job Moab.1
 
State: Removed
Completion Code: -1 Time: Mon Nov 14 12:10:08
Creds: user:jane group:jane
WallTime: 00:02:47 of 00:10:00
SubmitTime: Mon Nov 14 12:07:52
(Time Queued Total: 00:00:00 Eligible: 00:00:00)
 
Total Requested Tasks: 64
 
Req[0] TaskCount: 64 Partition: FLEXlm
NodeCount: 1
 
Allocated Nodes:
[node01:64]
 
 
IWD: /opt/native
Executable: /opt/native/spool/moab.job.FoZfIU
 
Execution Partition: FLEXlm
Flags: GLOBALQUEUE,PROCSPECIFIED
StartPriority: 0

    Note that the state is now Removed.

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