IV09725: JVM FAILS TO DECOMMIT 'SHMGET' ALLOCATED MEMORY DURING HEAP SHRI NKING ON AIX

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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
    .
    In AIX with Java6 , heap shrinking does not lead to memory being
    disclaimed.
    

Local fix

  • Running with JVM option -Xlp4K
    

Problem summary

  • In AIX with Java6 , heap shrinking does not lead to memory being
    disclaimed. The reason for this are as follows
    1) in Java6, page size defaults to 64k
    2) due to point (1), JVM uses the AIX call "shmget" to allocate
    memory
    3) present JVM design did not allow for disclaiming memory
    allocated through the "shmget" call.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR1
    6.0.1 SR1
    6.0.0 SR11
    .
    The JVM has been changed to disclaim/decommit "shmget" allocated
    memory.
    .
    To obtain the fix:
    Install build 20111108 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV09725

  • 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

    2011-10-28

  • Closed date

    2011-11-16

  • Last modified date

    2011-11-16

  • 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

  • R600 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Virtual Machine

Software version:

260

Reference #:

IV09725

Modified date:

2011-11-16

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