IV00844: EXCESSIVE CPU UTILIZATION BY JAVA JIT COMPILER

APAR status

• Closed as program error.

Error description

• Error Message: A Java application running on Java 5, Java 6 or
  Java 6.0.1 could appear to hang while 90% to 100% of CPU time is
  spent in the JIT compiler. A system core dump shows that the JIT
  compilation thread is executing a deeply self-recursive function
  named "findCallNodeInTree".
  .
  Stack Trace: findCallNodeInTree
  findCallNodeInTree
  .
  .
  .
  findSimpleCallReference
  TR_TransformInlinedFunction::transformReturn
  TR_TransformInlinedFunction::transformNode
  TR_TransformInlinedFunction::transform
  TR_InlinerBase::inlineCallSite
  .
  

Local fix

• This issue can be worked around using the -Xjit:disableInlining
  option. Note however that this will cause severe performance
  degradation.
  

Problem summary

• The inliner algorithm in the JIT compiler can, in some cases,
  incorrectly enter an infinite self-recursion.
  

Problem conclusion

• This defect will be fixed in:
  5.0.0 SR13
  6.0.0 SR10
  6.0.1 SR1
  .
  The inliner has been updated to avoid the infinite recursion.
  .
  To obtain the fix:
  Install build 20110531 or later
  

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:

  IV00845

Fix information

• Fixed component name

  JAVA 5 JIT

• Fixed component ID

  620500124

Applicable component levels

• R500 PSY

     UP