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z/OS MVS JCL Reference
Use the PRTY parameter to assign a selection priority to your job. Within a JES2 job class or a JES3 job class group, the system selects jobs for execution in order by priority. A job with a higher priority is selected for execution sooner; jobs with the same priority are selected on a first-in first-out basis.
Note: Depending on the JES2 initialization options in use at your installation, JES2 may ignore the PRTY parameter.
In a JES2 system, there are a number of factors that determine the order in which a particular job is selected for execution. Therefore, you cannot be assured that job priority (based on the PRTY you assign a job), job class, or the order of job submission will guarantee that the jobs will execute in a particular order. If you need to submit jobs in a specific order, contact your JES2 system programmer for advice based on how your system honors such requests. (z/OS JES2 Initialization and Tuning Guide provides JES2 system programmer procedures concerning job queuing and how to control job execution sequence.)
For more information about priority, see z/OS JES2 Initialization and Tuning Guide.
Considerations for an APPC scheduling environment
The PRTY parameter has no function in an APPC scheduling environment. If you code PRTY, the system will check it for syntax and ignore it.
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