PI76705: ENABLE VERBOSEGC BY DEFAULT ON WEBSPHERE APPLICATION SERVER FOR Z/OS

9.0.0.4: WebSphere Application Server traditional V9.0 Fix Pack 4
9.0.0.5: WebSphere Application Server traditional V9.0 Fix Pack 5
9.0.0.6: WebSphere Application Server traditional V9.0 Fix Pack 6
9.0.0.7: WebSphere Application Server traditional V9.0 Fix Pack 7
9.0.0.8: WebSphere Application Server traditional V9.0 Fix Pack 8
9.0.0.9: WebSphere Application Server traditional V9.0 Fix Pack 9
9.0.0.10: WebSphere Application Server traditional V9.0 Fix Pack 10
9.0.0.11: WebSphere Application Server traditional V9.0 Fix Pack 11
9.0.5.0: WebSphere Application Server traditional Version 9.0.5 Refresh Pack
9.0.5.1: WebSphere Application Server traditional Version 9.0.5 Fix Pack 1
9.0.5.2: WebSphere Application Server traditional Version 9.0.5 Fix Pack 2
9.0.5.3: WebSphere Application Server traditional Version 9.0.5 Fix Pack 3
9.0.5.4: WebSphere Application Server traditional Version 9.0.5 Fix Pack 4
9.0.5.5: WebSphere Application Server traditional Version 9.0.5 Fix Pack 5
WebSphere Application Server traditional 9.0.5.6
9.0.5.7: WebSphere Application Server traditional Version 9.0.5 Fix Pack 7
9.0.5.8: WebSphere Application Server traditional Version 9.0.5.8
9.0.5.9: WebSphere Application Server traditional Version 9.0.5.9
9.0.5.10: WebSphere Application Server traditional Version 9.0.5.10
9.0.5.11: WebSphere Application Server traditional Version 9.0.5.11

APAR status

• Closed as new function.

Error description

• Enable verboseGC by default on servers created using
  WebSphere Application Server for z/OS version 9.0.0.4.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:  All users of IBM WebSphere Application      *
  *                  Server for z/OS.                            *
  ****************************************************************
  * PROBLEM DESCRIPTION: Verbose garbage collection (verboseGC)  *
  *                      is disabled by default.                 *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Starting in version 9.0.0.4 WebSphere Application Server
  for z/OS enables verboseGC by default for the Application
  Server, Node Agent, and Deployment Manager server types.
  This is a change in default behavior from previous releases
  wherein verboseGC is disabled by default for all server types.
  .
  "Verbose garbage collection" (verboseGC) is a setting in the
  Java virtual machine configuration for a server type, such
  as a Deployment Manager or Application Server.  When verboseGC
  is enabled (unset or set to true) in the server configration,
  WebSphere Application Server supplies the standard java option
  "-verbose:gc" to the java command line when launching the
  server.  The option directs the JVM to write verboseGC
  diagnostic data to native process streams, which on z/OS
  collect in JES job logs.
  .
  The new default verboseGC setting may be inappropriate for a
  particular server in your deployment.  To disable verboseGC
  on a server, disable (set to false) the "Verbose garbage
  collection" setting in the server's Java Virtual Machine
  configuration. Also, ensure that the Generic JVM Arguments
  field of the server's Java Virtual Machine configuration does
  not specify command-line argument "-verbose:gc".  After saving
  your changes to the configuration, verbose garbage collection
  will be disabled the next time the server is started.
  

Problem conclusion

• VerboseGC diagnostic data is critical to troubleshooting
  memory and performance problems, and the overhead is generally
  very low.  APAR PI76705 enables verboseGC by default to ensure
  diagnostic data is immediately available when such problems
  occur.
                                .
  APAR PI76705 is currently targeted for inclusion in fix pack
  9.0.0.4.  Please refer to the Recommended Updates page for
  delivery information:
  http://www.ibm.com/support/docview.wss?rs=180&uid=swg27004980
  

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:

Fix information

• Fixed component name

  WEBSPHERE FOR Z

• Fixed component ID

  5655I3500

Applicable component levels

• R900 PSY

     UP