PM89756: The CWOBJ0070W message warning message about the garbage collection policy and performance is not valid.

APAR status

• Closed as program error.

Error description

• In a WebSphere eXtreme Scale V8.6.0.1 standalone installation
  on Linux operating systems, running with memory-based eviction
  on several backing maps. Therefore, the installation is running
  the -Xgcpolicy:optthruput policy, as required per the
  following information center topic:
  http://pic.dhe.ibm.com/infocenter/wxsinfo/v8r6/topic/com.ibm.web
  sphere.extremescale.messages.doc/CWOBJ0070W.html.
  
  This configuration works. However, when you start the eXtreme
  Scale server, the following warning message is displayed:
  
  [4/15/13 9:03:26:843 EDT] 00000001 ServerImpl    W
  CWOBJ0070W: The IBM implementation of the JVM is using a
  garbage collection policy that might affect performance.
  
  The CWOBJ0070W warning is documented at
  http://pic.dhe.ibm.com/infocenter/wxsinfo/v8r6/topic/com.ibm.web
  sphere.extremescale.doc/cxsprogttl.html, and states that this
  warning is logged whenever any garbage collection policy other
  than -Xgcpolicy:gencon or -Xgcpolicy:balanced is
  used.
  

Local fix

• Developers are looking to turn the warning to an informational
  message to satisfy the customer request.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:  Customers using WebSphere eXtreme Scale     *
  *                  who want to tune the JVM garbage            *
  *                  collection policy.                          *
  ****************************************************************
  * PROBLEM DESCRIPTION: There is a conflicting CWOBJ0070W       *
  *                      message for the garbage collection      *
  *                      policy and the information center       *
  *                      documentation.                          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  The CWOBJ0070W message did not take into consideration the
  change in the default garage collection policy for newer Java
  Development Kits (JDK).  The warning is not valid in all cases.
  

Problem conclusion

• The new informational message, CWOBJ0070I, in the SystemOut.log
  file shows the garbage collection policy that is being
  used. That policy is based on the default for the JDK being
  used, or it is overwritten by the -Xgcpolicy option that is
  set. Users might use this information to tune the environment.
  

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

  WS EXTREME SCAL

• Fixed component ID

  5724X6702

Applicable component levels

• R850 PSY

     UP

• R860 PSY

     UP