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IV18641: JVM PERFORMANCE BOTTLENECKS WITH LARGE PAGES ENABLED

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Error Message: In large application server environments,
    performance throughput bottlenecks may be observed in the J9 JVM
    with large pages enabled.
    .
    Stack Trace: N/A
    .
    

Local fix

Problem summary

  • Several performance bottle necks in large application server
    environments have been observed and attributed to the existing
    support for large pages within the JVM. Also, several
    deficiencies with block frequency heuristics used as part of the
    JIT compiler component have also been identified.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR2
    .
    The JVM has been modified to address the large page support
    issues presented and to improve the identified deficiencies in
    block frequency heuristics.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV18641

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-03-30

  • Closed date

    2012-07-17

  • Last modified date

    2012-07-17

  • 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

    J9 COMMON CODE

  • Fixed component ID

    620700127

Applicable component levels

  • R260 PSY

       UP

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Document Information

Modified date:
21 February 2022