You look at performance monitoring data for your CICS Transaction Server for z/OS (CICS TS) regions and notice that one of the regions has an extremely high amount of CPU usage for transaction CONL. This is the long-running CICSPlex SM (CPSM) transaction. You might see high CPU usage for other long running CPSM transactions such as COI0, CONA, and CONL.
If you have CPSM running, CONL will run on the CICS region from initialization until the region is brought down. If the system initialization parameter (SIT) monitoring frequency parameter MNFREQ is allowed to default, the CICS monitoring data is never reset. Therefore, it appears that the transaction is taking large amounts of CPU. This is true for any long running transaction.
Set the MNFREQ SIT parameter, instead of allowing it to default to zero.
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CICSPLex SM CICSPlexSM CPSM CP/SM