Using PERFM

Use the PERFM keyword when part of PSF performs below your expectations and the performance problem cannot be corrected by tuning the system. Use this keyword only when no other keyword seems applicable. Ensure that the application programs, the JCL, and the data set definitions are thoroughly examined.

The speed with which a job is processed can be affected by the number and complexity of the resources used. Also, if you are running a 3800 printer under compatibility mode and then switch to all-points-addressable (APA) mode, you might note a difference in performance. This difference is not necessarily caused by a performance problem.

To specify the PERFM keyword:

1. Add the PERFM keyword to the string. The format of the keyword string might now be:

   5655M3201 PERFM

2. Select the correct environment keyword. See Specifying environment and printer keywords.