CICS IA performance figures running the CICS VSAM application

The CICS® VSAM workload (DSW) was run in a multiple address space environment with, and without, CICS IA interdependency data collection running.

The CICS IA data collection overhead was measured to be 0.07 milliseconds per transaction.

Table 1 shows figures for the combined AOR regions.

Table 1. CPU consumed per transaction at different transaction rates for a CICS VSAM application
Transactions per second CPU per transaction with IA stopped CPU per transaction with IA running Delta per transaction Delta per file control call
538 0.64ms 0.71ms 0.07ms 0.007ms
723 0.65ms 0.72ms 0.07ms 0.007ms
1081 0.65ms 0.73ms 0.08ms 0.008ms
1639 0.66ms 0.73ms 0.07ms 0.007ms

With an average of 12.76 file control calls for tasks that issue file control calls, and with 75% of tasks issuing file control calls, the number of file control calls per task is 9.57 (12.76*75/100). This figure is divided into the "Delta per transaction" to obtain the "Delta per file control call" value.

This 7 microsecond value matches the value obtained from the component testing for file control interdependency data collection, described earlier.