IMS Monitor trace event intervals
The IMS Monitor trace
interval is defined by the master terminal operator's use of the /TRACE command
between the start and stop command entries. The online IMS events are recorded in IMS Monitor records placed in the IMSMON data
set.
The event timings are related to dependent region activity. The following figure shows the boundaries of the timed event intervals.
The Monitor trace interval includes the following intervals:
- Scheduling and Termination
- Block loader busy
- Intent failures (exclusive intent and data sharing) and Schedule failures (PSB busy and space failure)
- Sched/Term elapsed
- NOT-WAIT
- ACBLIB waits
- DB Flush waits
- DB CLOSE waits
- Region occupancy (which overlaps with all of Sched/Term elapsed)
- Schedule to first call
- Elapsed execution
The NOT-WAIT time for a region is the elapsed time not accounted for by wait time. Any delay coming from either paging or the processor being dispatched for a higher priority task results in an increase in the NOT-WAIT times.
