If the performance expectations of the user are not being satisfied despite the fact that resources are being utilized efficiently and have short wait times, this indicates that the resource requirements per user request are too high (e.g. CPU time requirement and/or number of I/O operations per transaction).
Indications regarding resource requirements can be found in the figures supplied by the SM2 routine TASK on
CPU time consumption
number of SVC calls in TU
number of DMS I/O operations
For a more detailed investigation of application program behavior, SM2 user task measurement with an SM2-PA analysis is required:
Program counter statistics enable those program areas to be pinpointed which are frequently executed.
The SVC statistics contain all the SVC numbers called and their call addresses.