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Status Future consideration
Workspace z/OS
Categories LE
Created by Guest
Created on Jan 19, 2022

RELATED IDEAS

Reduce the increase of number of CICS getmains after LE z/OS 2.4 and new parameter CEENXSTG

After the migration to z/OS 2.4 the number of CICS getmains increased by 40 percent.
This tremendous increase is caused by the introduction of the new Language Environment parameter CEENXSTG.
CEENXSTG is a parameter that indicates whether non-executable memory is enabled. ON implies Non-executable memory is enabled.
OFF says Non-executable memory is not enabled. If an installation chooses to set OFF, that memory will be marked executable.
In a CICS environment CEENXSTG is not proper designed to work together with the CICS TS AUTODST (automatic dynamic storage tuning) functionality. AUTODST has been introduced to lower the number of Getmains done by LE. With the new parameter CEENXSTG the number of Getmains are increasing in both cases setting ON or OFF for CEENXSTG.

CICS AUTODST parameter and LE are working tied together. The current design of the LE automatic storage tuning for CICS unfortunately does not support the use of 2 types of HEAPs and therefore the increase in the number of CICS getmains is a negative result. The LE software support team asks us to open a RFE to change the design of CEENXSTG with CICS and LE.

The increase of CICS getmains introduced with CEENXSTG causes about additional 360 million CICS getmains per hour in our installation. This increase will produce an extra cost in MSUs of around 20,000 MSUs per year for our TFP contract. Customers still using MLC contract will also suffer by an increase of MSU usage in their R4HA intervall.


Idea priority Urgent

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