gtpm1m3gTPF V4R1 Migration Guide: 3.1 to 4.1

Using the Program Event Recording (PER) Trace Facility

Use the new ZSPER command to alter and display program event recording (PER) options. Use the following parameters of the ZSPER command to activate, change, and display the status of the PER trace facility for an IBM Enterprise Systems Architecture (ESA) processor.

DISPLAY
Indicates whether the PER trace facility is currently active or inactive.

STORE
Activates the storage alteration event.

INSTRUCT
Activates the instruction fetching event.

BRANCH
Activates successful PER branching events. This parameter is valid only for ESA/390 processors.

END
Disables the PER trace facility.

See TPF Operations for more information about the ZSPER command.

Only one function of the PER trace facility can be active at a time. In addition, execution of the PER trace facility is stopped automatically when more than 10 PER interrupts are received within any 10 second interval.