The storage tuning user exit provides a programming interface that allows you to collect Language Environment storage tuning information and to set the Language Environment runtime option values for STACK, LIBSTACK, HEAP, ANYHEAP and BELOWHEAP. See Storage tuning user exit for more information.

The storage tuning user exit is available on CICS® and on non-CICS environments when LRR is used.

To create a storage tuning user exit on CICS:

1. Create an assembler language routine that conforms to the syntax described in Storage tuning user exit.
2. Translate your exit with the CICS translator. The SYSEIB translator option must be used.
3. Assemble and link edit your exit into a library that is in the CICS DFHRPL DD concatenation. The member name of the exit must be CEECSTX.
4. Define program CEECSTX to CICS with LANGUAGE(ASSEMBLER). The definition for the program must be available at CICS start-up.

To create a storage tuning user exit on non-CICS:

1. Create an assembler language routine that conforms to the syntax described in Storage tuning user exit.
2. Assemble and link edit your exit into a library that Language Environment can load at runtime. The member name of the exit must be CEEBSTX.