Each time an MVS™ initiator requests work, generalized main scheduling (GMS) selects and schedules a job for execution. The job that GMS selects depends primarily upon initialization parameters that you have specified.

Deadline scheduling and dependent job control (DJC), additional GMS functions, enable you to control when jobs execute. With deadline scheduling, you specify a deadline by which you want the job to run. JES3 periodically increases the job's selection priority in an attempt to run the job by the specified deadline. DJC allows you to create a network of related jobs.