You can use the dispatcher TCB statistics from the DFH0STAT and DFHSTUP utility programs to monitor the S8 TCBs in the SSL pool. The maximum number of TCBs is set by the MAXSSLTCBS system initialization parameter. If you want to improve the performance of SSL, you can use the dispatcher reports to find out if there are a large number of tasks waiting for an S8 TCB. Also look at the number of tasks that have queued. If both fields report a large number, increase the maximum number of S8 TCBs using the CEMT INQ DISPATCHER or CEMT SET DISPATCHER commands. If you have a small number of tasks queued, but a large number of waits, you can decide whether you want to increase the number of S8 TCBs. Increasing the number by one or two could make a difference to the number of waits and reduce the tasks queued, without causing significant overheads in storage.
The maximum number of S8 TCBs that you can set is 1024. However, setting a very large number of S8 TCBs can also impact performance because of the amount of storage used. If CICS runs out of storage, you get a TCB attach failure. This is reported in the dispatcher reports for the S8 TCB mode statistics.
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