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Tuning the gateway to avoid out of memory conditions

The CICS® Transaction Gateway statistics provide information to help you avoid out of memory conditions.

You can use the statistics that are generated by CICS Transaction Gateway to establish whether the amount of virtual storage being used by CICS Transaction Gateway might exceed the amount that is available to the CICS Transaction Gateway address space.

The amount of memory per process in which to run the Gateway daemon and Client daemon processes is determined by the underlying operating system. Use the tools provided by the operating system to monitor memory usage for the Client and Gateway daemons.

Note that, although increasing the heap size of the underlying JVM of the Gateway daemon will increase the time between garbage collection events and will generally be beneficial for performance, any improvements will gradually diminish beyond a certain size. Increasing the heap size to unnecessarily high values reduces the amount of process memory available for creating connection manager and worker threads, and increases the risk of hitting an out of memory condition within the JVM.


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Timestamp icon Last updated: Tuesday, 19 November 2013


https://ut-ilnx-r4.hursley.ibm.com/tg_latest/help/topic/com.ibm.cics.tg.doc//ctgunx/f0200040.html
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