Storage tuning user exit
In an environment where Language Environment® is being initialized and terminated constantly, such as CICS®, IMS, or other transaction processing type of environments, tuning the storage options can improve the overall performance of the application.
This helps to reduce the GETMAIN and FREEMAIN activity. The Language Environment storage tuning user exit is one way that you can manage the task of selecting the best values for your environment. The storage tuning user exit allows you to set storage values for your main programs without having to linkedit the values into your load modules.
Related references
Storage tuning user exit (z/OS® Language Environment Customization)
Storage tuning user exit (z/OS® Language Environment Customization)