JES2 Initiator

An initiator within JES 2 is a system routine that loads a job into an address space.

The number of active initiators is an indicator of how many batch jobs can run at the same time on the system.

They are also divided into different classes, which have to match with the submitted jobs

A JES initiator can have multiple classes assigned to it. It will try to match jobs based on the order in which the classes appear

For example if the initiator was assigned classes A, B and C it will attempt to find the highest priority Class A job and process it, even if there are higher priority Class B jobs waiting.