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IV80393: 20-34% REGRESSION IN SPECJVM2008.SERIAL ON PPC

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: N/A
    .
    The performance regressed 20-34% running micro benchmark
    SPECjvm2008.serial on PPC.
    

Local fix

Problem summary

  • The regression was introduced by the fix to a faulty
    optimization which is described in APAR IV67534. After disabling
    the faulty optimization, the JIT generates some expensive
    instructions for method java.lang.ref.SoftReference.get() on
    PPC.
    

Problem conclusion

  • The JIT compiler has been updated to generate more efficient
    instructions for java.lang.ref.SoftReference.get().
    .
    This APAR will be fixed in the following Java Releases:
       8    SR2 FP10  (8.0.2.10)
       7 R1 SR4       (7.1.4.0)
    .
    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 number

    IV80393

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    130

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-01-15

  • Closed date

    2016-01-15

  • Last modified date

    2016-01-15

  • 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

  • R130 PSY

       UP

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Document Information

Modified date:
15 January 2016