Language Environment automatic storage tuning for CICS

Language Environment® automatic storage tuning for CICS® provides automatic storage tuning (AUTOTUNE) of Language Environment STACK, LIBSTACK, HEAP, BELOWHEAP and ANYHEAP initial size values. Automatic storage tuning of the Language Environment storage areas can improve the performance of applications running on CICS by reducing the CICS GETMAIN/FREEMAIN activity associated with acquiring Language Environment stack and heap increments. In order to use Language Environment automatic storage tuning for CICS, the CICS system initialization parameter AUTODST must be set to YES. The CICS system initialization parameter AUTODST is available only on:

CICS Transaction Server Version 1 Release 3 with APARs PQ39052, PQ45031, and PQ55351.
CICS Transaction Server Version 2.
CICS Transaction Server Version 3.

Note: When Language Environment Automatic Storage Tuning for CICS is used, the capability of the storage tuning user exit is changed. For example, the storage tuning user exit can no longer get storage information. See z/OS Language Environment Programming Guidefor information about the Language Environment storage tuning user exit.

Note: CICS TS 3.1 and higher supports XPLINK programs in a CICS environment. The automatic storage tuning exit is not supported for these programs.