How to know if zIIP is beneficial for a CA IDMS CV.

Document ID : KB000039312
Last Modified Date : 14/02/2018
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Introduction:

How do I know if zIIP is of benefit to a particular CV?

Using the zIIP feature may not be beneficial to every CA IDMS CV. The more user written code a CV executes (ADS, cobol, assembler), the less likely a CV is to benefit from using zIIP. The more system code a CV executes (mostly ERUS processing), the more likely a CV is to benefit from zIIP.

Instructions:

The simplest way to determine if ZIIP is beneficial for a CV is to determine the total amount of TCB CPU time per task. If that figure decreases when ZIIP is enabled, then it is of benefit to that CV.

Using DCMT D SUBT EFF and DCMT D STA SYS you can calculate this figure. The attached Word document, zipstats.docx, shows examples of this with and without zIIP. The green shaded figures are the statistics used in the calculation. The red number is the final result.

Note that the final statistic “with zIIP” (0.002755) is lower than that “without zIIP” (0.002964). Therefore, this CV is benefiting from using zIIP.

Additional Information:

For more information, see the manual “CA IDMS System Operations Guide” Appendix A, “z/OS Considerations”, “zIIP Exploitation”.

See also Knowledge Base documents TEC609497 and TEC486100.

File Attachments:
TEC1015504.zip