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ABCs of z/OS System Programming Volume 13 by Juha Vainikainen, Paul Rogers

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JES3 job scheduling - GMS
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 ...

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