IV34696: PERFORMANCE REGRESSION IN CHARACTER CONVERSION AFTER APPLYING APAR IV29910

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APAR status

  • Closed as program error.

Error description

  • Error Message: More time spent in java.io character conversion
    routines such as sun.io.CharToByteASCII.convert
    .
    Stack Trace: N/A
    .
    N/A
    

Local fix

Problem summary

  • A fix for an earlier bug made the jit compiler more
    conservative, causing it to miss a valid optimization
    opportunity in the conversion routines during induction variable
    analysis.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR4
    6.0.1 SR5
    .
    The jit compiler's induction variable analysis was improved to
    find the optimization opportunity that restored character
    conversion performance.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV34696

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2013-01-14

  • Closed date

    2013-01-14

  • Last modified date

    2013-02-13

  • 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

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

260

Reference #:

IV34696

Modified date:

2013-02-13

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