TPT buffer and shared memory usage - response (1) by feinholz

TPT will allocate a certain amount of shared memory which will be enough for most jobs.
In the event a job is configured in such a way that more shared memory is needed, TPT engineering would instruct you to use the -h command line option to direct TPT to allocate more.
Those values are for informational purposes only.
They will assist TPT engineering in the event a job runs out of memory (and saves the user from having to re-run a job with tracing enabled in order to give the information to the GSC or TPT engineering).