PH27111: PROVIDE NEW CICS TS 5.5 FEATURE TOGGLE WHICH ALLOWS CICS TO SWITCH THE USS PROCESS RELEASE BEHAVIOUR.

Obtain the fix for this APAR.

APAR status

• Closed as new function.

Error description

• CICS TS 5.5 changed the way that CICS manages the release of USS
  processes such as L8 and L9 TCBs.
  
  This APAR is to provide a new feature toggle to make it possible
  to switch back to the pre CICS TS 5.5 design.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All CICS users.                              *
  ****************************************************************
  * PROBLEM DESCRIPTION: Since CICS TS 5.5 USS process release   *
  *                      behaviour has changed for L8 and L9     *
  *                      TCBs.                                   *
  ****************************************************************
  Usage of IP CICS Sockets can result in additional CPU usage from
  CICS TS 5.5. This is as a result of a change in CICS TS 5.5 to
  make a BPX1MPC call when returning an L8/L9 TCB to the pool at
  end of task. This ensures that USS processes do not persist
  longer than is necessary.
  This APAR introduces a feature toggle to allow the behaviour to
  be reverted to that of CICS TS 5.4 and before, under guidance of
  IBM Support.
  

Problem conclusion

• New feature toggle 'com.ibm.cics.ds.freeussprocesses' has been
  introduced to allow this USS process release logic to be altered
  under the guidance of IBM Support.
  
  The Knowledge Centers for CICS TS 5.5 and 5.6 will be updated
  to document this new feature toggle.
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  UI71149 UI71150

Modules/Macros

• DFHDSDM  DFHDSKE
  

Fix information

• Fixed component name

  CICS TS Z/OS V5

• Fixed component ID

  5655Y0400

Applicable component levels

• R200 PSY UI71150

     UP20/08/21 P F008

• R300 PSY UI71149

     UP20/08/21 P F008

Fix is available

• Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.