Why Use the Queueing Manager Services

A queueing manager is a subsystem or application that queues work requests to workload management for execution by one or more server address spaces.

Queueing manager services allow MVS™ to:

• Dynamically start and stop server address spaces based on workload.
• Control the number of server instances per server address space.
• Manage the work queues associated with the server address spaces to meet the performance goals set by the customer.

With the dynamic management of server address spaces, an installation does not need to calculate the proper number of address spaces to process work, nor do they have to monitor workload fluctuations that change the number of address spaces needed. Customers can segregate work requests into different server address spaces if this is important for security or integrity.

Enclaves are required to be used with the queueing manager services. This means that customers can define velocity and discretionary goals for work as well as response time goals. Multiple period control is also available for work running in enclaves.

Queueing manager services may provide incentive to subsystems who run with multiple tasks in one address space to switch to multiple address spaces. The queueing manager services make it easier for installations to isolate individual work requests from each other, by running only one in each execution address space, with workload management managing the number of execution address spaces.

Table 4 shows a summary of the queueing manager services.