These examples show the relationship of some of the activity controls. Assume the system activity level is 100 and the jobs are single-threaded.
Two subsystems, SBSA and SBSB, use the Base memory pool to run jobs. SBSA currently has two jobs running in this memory pool and SBSB has one. A job queue entry in the subsystem description for SBSB specifies that any number of jobs can be started. The activity level of the Base memory pool is 3. Therefore, only three jobs in the Base memory pool can compete for the processing unit at a time. However, all of the jobs are started.
One autostart job, two workstation jobs, and one batch job (four jobs in all) are in subsystem SBSC. The MAXACT for SBSC is specified as 4. No matter what is specified for the MAXACT of the work entries, no other jobs can be started until at least one job completes running.
Subsystem SBSE is a batch subsystem for which 1 is specified for MAXACT. Although the job queue entry does not specify MAXACT, the limit is one job because 1 is specified for MAXACT for the subsystem. Therefore, jobs are processed in job priority one at a time off the job queue.