I submitted my job, but I forgot to set the wallclock time and the default of 2 weeks is too short. How do I increase the wallclock time for my job?

You can only change the wallclock time for jobs that are queued, not for running jobs. In some cases, the HPC staff can adjust the time for running jobs; please send an email to This e-mail address is being protected from spambots. You need JavaScript enabled to view it . We can not always extend the wallclock time, our scheduler uses a reservation system and one of the nodes that your job is running on might be reserved for another job.

Use the mjobctl command with the -m wclimit=X flag:

$ checkjob 844819
...
WallTime: 00:00:44 of 14:00:00:00
SubmitTime: Tue Jun 2 09:47:02
..
$ mjobctl -m wclimit=15:00:00:00 844819

set walltime attribute for job 844819 to '15:00:00:00'
$ checkjob 844819
...
WallTime: 00:02:06 of 15:00:00:00
SubmitTime: Tue Jun 2 09:47:02
..
$ mjobctl -m wclimit+=10:00:00:00 844819

set walltime attribute for job 844819 to '25:00:00:00'
$ checkjob 844819
...
WallTime: 00:02:59 of 25:00:00:00
SubmitTime: Tue Jun 2 09:47:02
..

Usage of mjobctl:

• mjobctl -m wclimit=X:Y:Z:00 jobid
  Sets the wallclock for job jobid to X days, Y hours and Z minutes.

• mjobctl -m wclimit+=X:Y:Z:00 jobid
  Add X days, Y hours and Z minutes to the wallclock of job jobid.