RPTSTG

Default
OFF
Recommended
OFF
Considerations
The RPTSTG option allows you to get a report on the storage that was used by an application. This report is produced after the application has terminated. Thus, if the application abends, the report may not be generated. The data from this report can help you fine tune the storage parameters for the application, reducing the number of times that the LE storage manager must make system requests to acquire or free storage.

Collecting the data and generating the report can result in some additional overhead. Specifying RPTSTG(OFF) will eliminate this overhead.

Performance considerations using RPTSTG: The degradation in a call intensive program was measured to be more than 200%.
Note: The program did nothing except repeatedly calling a number of subprograms, which were empty (that is, containing only a GOBACK statement).

related references
RPTSTG (z/OS Language Environment Programming Reference)
RPTSTG (z/OS Language Environment Customization)