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Deciding under which subsystem a started task should run
z/OS MVS JCL Reference
To decide under which subsystem your started task should run, determine what services the task requires and what support the primary (job entry) subsystem, the master subsystem, and other subsystems provide.
Inform the system programmer responsible for the master JCL of your decision. Then code the name of the subsystem on the START command's SUB= keyword.
Without a SUB= keyword on the START command, the operating system will create the started task under the primary job entry subsystem (JES2 or JES3) unless the task itself is a subsystem, that is, it is either defined
(A subsystem, unless requested to start under the primary JES subsystem by setting flag SSCTUPSS in the SSCVT, starts under the master subsystem, MSTR.)
A started task, regardless of the subsystem under which it runs, is demand-selected and runs in its own address space. Several considerations apply:
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