IV83479: POTENTIAL PERFORMANCE REGRESSION WITH INTERFACE DISPATCH ON 31-B IT JVM

APAR status

• Closed as program error.

Error description

• Error Message: N/A
  .
  Stack Trace: N/A
  .
  Performance of interface dispatch can be affected when a current
  method calls a resolved interface method that was recently
  recompiled to a higher optimization level. This will only affect
  the 31bit JVM running on z systems.
  

Local fix

Problem summary

• The problem is caused by the JIT compiler not updating a
  resolved interface method in an interface dispatch sequence
  after that method was recompiled, causing the interface dispatch
  to call a less optimal version of the resolved method.
  

Problem conclusion

• The JIT compiler has been updated to generate code for interface
  dispatch so that the optimal version of a resolved method is
  called.
  .
  This APAR will be fixed in the following Java Releases:
   8 SR3 (8.0.3.0)
  .
  Contact your IBM Product's Service Team for these Service
  Refreshes and Fix Packs.
  For those running stand-alone, information about the available
  Service Refreshes and Fix Packs can be found at:
   https://www.ibm.com/developerworks/java/jdk/
  

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:

• Fixed component name

  JIT

• Fixed component ID

  620700124

Applicable component levels

• R130 PSY

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