Establishing performance objectives for DDF threads

Threads are assigned a service class by the classification rules in the active WLM service policy. Each service class period has a performance objective (goal), and WLM raises or lowers that period's access to system resources as needed to meet the specified goal.

About this task

For example, the goal might be application APPL8 should run in less than 3 seconds of elapsed time 90% of the time.

No matter what your service class goals are, a request to start an address space might time out, depending on the timeout value that is specified in the TIMEOUT VALUE field of installation DSNTIPX. If the timeout value is too small, you might need to increase it to account for a busy system.

Procedure

To establish performance objectives for DDF threads and the related address spaces:

  1. Create a WLM service definition that assigns service classes to the DDF threads under subsystem type DDF and to the DDF address space under subsystem type STC.
  2. Install the service definition using the WLM menus and activate a policy (VARY WLM,POLICY=policy).