IV01674: MISSING REFERENCES BETWEEN SOME OBJECTS IN A PHD HEAP DUMP

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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
    .
    When using a phd file and Memory Analyzer to diagnose memory
    usage issues there were references missing between objects on
    the heap that the user knew would have referenced each other.
    

Local fix

  • Memory Analyzer can use a system dump as well as a heap dump. A
    system dump can be taken instead of a heap dump and used to
    diagnose heap usage issues.
    System dumps are significantly larger than heap dumps and more
    free disk space may be required in order to use them.
    

Problem summary

  • PHD heapdumps were missing references between objects located in
    different parts of the heap. References between objects in the
    tenured and nursery areas were not being included in the phd
    files generated when a heap dump occurred.
    This problem only occurred when using the gencon gc policy.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.1 GA FP1
    .
    The JVM heapdump generator has been updated to include
    references that cross different regions of the heap in the PHD
    file.
    .
    To obtain the fix:
    Install build 20110222 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV01674

  • 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

    2011-06-13

  • Closed date

    2011-06-13

  • Last modified date

    2011-06-13

  • 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

    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 #:

IV01674

Modified date:

2011-06-13

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