Maximum Number of Running Jobs a user can submit to a particular queue (512 cores in this example)

qmgr -c "set queue your_queue_name max_run_res.ncpus = [u:PBS_GENERIC=512]"

Minimum Number of Running Jobs a user can submit to a particular queue ( 4 cores in this example)

qmgr -c "set queue your_queue_name resources_min.ncpus=4"

Allow maximum queued jobs limit at Server level

% qmgr -c "set server max_queued = [u:PBS_GENRIC=128]"

Apply maximum queued jobs limit at Queue Level

% qmgr -c "set queue your-queue-name max_queued = [u:PBS_GENRIC=128]"

Apply maximum Running jobs limit at Server Level

% qmgr -c "set server max_run = [u:PBS_GENRIC=128]"

Apply maximum running jobs limit at Queue Level

% qmgr -c "set queue your-queue-name max_run = [u:PBS_GENRIC=128]"

If you need to do a quick test on the batch mode, you can use this command

qsub -l select=1:ncpus=4 -l walltime=04:00:00 -q my_queue -P my_project_group -- /bin/sleep 100

Where

-q refers to the queue
-P refers to the Project Group

Nifty one-liner to check on queue priority

qmgr -c " p q @default" | grep -i Prioity

set queue queue1 Priority = 150
set queue queue2 Priority = 200
set queue queue3 Priority = 300

Scenario 1: How do we restrict the users to a certain maximum job size within a maximum concurrent number of jobs?

For example, if you would like to restrict users using this queue to a maximum of 4 cores per jobs. But his or her concurrent jobs cannot exceed 16?

qmgr -c "set queue workq max_run_res.ncpus = [u:PBS_GENERIC=16]"
qmgr -c "set queue workq resources_max.ncpus = 4"

The first limit sets max of 16 cores per user for the workq queue (for all jobs)
The second limit sets max of 4 cores per job for workq queue

Scenario 2: How do we ensure that users only run a minimum number of cores in the queue?

For example, if you would like to restrict the users to a minimum 32 cores per job.

qmgr -c " s q workq resources_min.ncpus=32"

Test:

qsub -l select=1:ncpus=16 -q workq -- /bin/sleep 100
qsub: Job violates queue and/or server resource limits

Scenario 3: How do we ensure that users run a minimum number of GPGPU in the queues?

qmgr -c "set server max_run_res.ngpus = [p:my_project_code=2]"