Is there a way to specify different queues automatically with libIGCM?

Author: M. McGrath
Last revision: 2020/02/28, J. Lathière

I've often found that when I'm running on Obelix, I want to change the default queue used by libIGCM. For example, if I'm running short test jobs, or larger parallel runs, I don't want to be submitting to the queue 'medium'. There is a very simple way to do this on libIGCM 2.1.1.

The file libIGCM/AA_job is the template for the Job_* files created by libIGCM. In there, you can find header information for the different predefined machines at IPSL (irene, jeanzay, obelix, ciclad/climserv). For example for obelix, find the following header information:

#-Q- lxiv8 ######################
#-Q- lxiv8 ## OBELIX      LSCE ##
#-Q- lxiv8 ######################
#-Q- lxiv8 #PBS -N ::Jobname::
#-Q- lxiv8 #PBS -m a
#-Q- lxiv8 #PBS -j oe
#-Q- lxiv8 #PBS -q medium
#-Q- lxiv8 #PBS -o Script_Output_::Jobname::.000001
#-Q- lxiv8 #PBS -S /bin/ksh
#-Q- lxiv8 #PBS -v BATCH_NUM_PROC_TOT=::JobNumProcTot::
#-Q- lxiv8 #PBS -l nodes=1:ppn=::JobNumProcTot::

In order to change the queue to the short queue or the medium parallel queue (the two I use most often), you need to change the line

#-Q- lxiv8 #PBS -q medium

to

#-Q- lxiv8 #PBS -q short

or

#-Q- lxiv8 #PBS -q mediump

You can now create the main job using ins_job command as usual. This will ensure that all computing jobs submitted after the first job are in your desired queue.

If you want to change as well the post-processing jobs, this can also be done in the same way in corresponding libIGCM/AA_* file. For example, change the file libIGCM/AA_create_ts if you want to change the default queue in the create_ts.job. After changing the post-treatement AA_* files, you need to delete the corresponding *.job files (for example libIGCM/create_ts.job) and relaunch ins_job to create them again.