Your general strategy is to decide the origin of the problem
being experienced by performing a set of tasks.
Complete the following tasks to decide on the origin
of the problem:
Procedure
- Isolate the problem into one of the following categories:
- High paging rate seems to be slowing some or all of the workload.
- High utilization of the processor by some subset of the total
workload is causing dispatching problems for another (lower-priority)
subset.
- I/O contention in the DASD subsystem is slowing some subset of
the workload.
- Utilization of, or contention for, resources associated with the
communications subsystem is slowing the transmission of input or output
messages.
- Within IMS, utilization of
physical resources (processor, I/O, storage) or contention for logical
resources (pools, regions, control blocks, latches) has a negative
impact on the performance of some or all of the transactions in one
of the following areas:
- Input or output message processing, including input queuing and
Message Format Services (MFSs)
- Program scheduling and termination
- Program load and initialization
- Program execution
- Investigate further, if necessary, after you isolate the
problem area, to determine:
- The precise nature of the problem
- The principal offenders by transaction or other category
- The tuning action most likely to alleviate the problem
- Take the appropriate tuning action to prevent the problem
from recurring.