IV00844: EXCESSIVE CPU UTILIZATION BY JAVA JIT COMPILER

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You can track all active APARs for this component.

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 number

    IV00844

  • Reported component name

    JAVA 5 JIT

  • Reported component ID

    620500124

  • Reported release

    500

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-05-27

  • Closed date

    2011-05-30

  • Last modified date

    2011-05-30

  • 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



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

5.0

Reference #:

IV00844

Modified date:

2011-05-30

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