CICS data for z/OS and z/VSE are very similar. Since zVPS started supporting CICS on z/OS, it was very easy for us to also support CICS on z/VSE.
The primary objective of VSEMON is to provide full performance management at extremely low overhead. Including CICS in this suite met the same objective. Installations processing 100 transactions per second may not even notice any increase in the zVPS processing requirements.
We intercept the data that is collected by DMF (the CICS Data Management Facility) on z/VSE, and send it to z/VM. The same way that we send data to z/VM from z/OS.
Velocity Software on all platforms has supported a one minute reporting interval for operational alerts and ease of performance analysis. In z/VSE, there is the DMF interval setting, and a CICS interval setting for providing statistics and for providing details on inflight transactions.
An analysis of effects of DMF indicates that it is negligible. The VSE job screen shows that DMFSTART is using 0.1% of the CPU. In this case while CICS is executing 7 transactions per second.
DMF can be configured to not write to the VSAM collection files. That can reduce some of the overhead.
The first screen shows the number of transactions in the interval. In this case 440, which is a little more than 7 transactions per second.
Screen: ZOSCIX2 Velocity Software - VSIVM4 ESAMON 5.121 08/10 1 of 2 CICS Transaction Analysis SYSID V62B APPLID * <-Response Time-> <---Dispatch
Total Susp Disp CPU PC Time SYSID APPLID Group Count Resp Time Time Time Load -------- ---- -------- -------- ----- ----- ----- ----- ----- ----- 13:41:00 V62B CICSJA95 Totals 440 3.673 3.537 0.136 0.015 0
The next screen shows the DMF CPU Utilization.
Screen: ESAVSEJ Velocity Software - VSIVM4 ESAMON 5.121 1 of 3 VSE Job/Step Performance VSE ZVSE61B J Part Job Phase <- CPU% -> Time Node Id Name Name CPU Ovhd -------- -------- ---- -------- -------- ----- ---- 13:41:00 zvse61b Z1 DMFSTART DFHDFSIP 0.1 0.0 13:40:00 zvse61b Z1 DMFSTART DFHDFSIP 0.2 0.0
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