PRIORITYPG specifies a list of performance group numbers that are used with the nice(), setpriority(), and chpriority() callable services when the system is running in goal mode.

If you are using your system to run a critical real-time application program, specify a list of performance group numbers. It is difficult to run both real-time application programs and general users on the same z/OS UNIX system because you cannot restrict any set of users from access to the nice() and setpriority() functions. For more information, see Controlling dispatching priorities.