IV01625: PERFORMANCE REGRESSION WHEN USING -XNOCOMPACTGC

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: N/A
    .
    Performance regressions were experienced in workloads using the
    -Xnocompactgc option when compared to pre 2.6 VMs.
    

Local fix

Problem summary

  • New heap management algorithms changed the ordering in which
    memory was allocated on the heap. This caused higher heap
    fragmentation in cases where compaction is not used. Higher heap
    fragmentation was making it impossible for Gencon to tenure
    large objects.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.1 GA FP1
    .
    The heap management algorithm was changed to alleviate
    fragmentation when compaction is not used.
    .
    To obtain the fix:
    Install build 20110210 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV01625

  • 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

    2011-06-12

  • Closed date

    2011-06-15

  • Last modified date

    2011-06-15

  • 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

    J9 COMMON CODE

  • Fixed component ID

    620700127

Applicable component levels

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Virtual Machine

Software version:

260

Reference #:

IV01625

Modified date:

2011-06-15

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