PM19671: TOO MANY JIT BUFFERS.

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Error Message: Heavy applications (mostly on WAS application
    servers) ran for days causes the JIT buffers to increase the
    consumption of native memory leading to an eventual native OOM.
    Though there is no standard way of telling there are too many
    JIT buffers, normal applications with anything more than 20 JIT
    buffers can be thought of affected with the issue.
    .
    Stack Trace: N/A
    .
    None.
    

Local fix

Problem summary

  • Heavy applications (mostly on WAS application servers, only on
    zOS) ran for days causes the JIT buffers to increase the
    consumption of native memory leading to an eventual native OOM.
    Though there is no standard way of telling there are too many
    JIT buffers, normal applications with anything more than 20 JIT
    buffers can be thought of affected with the issue. The leak was
    seen to grow upto 75 MB when the native memory usage was around
    200 MB.
    The problem is fixed in SR13-FP6. After upgrading to this
    version, it is also required to export this JIT compiler option
    for the fix to take effect:
    JITC_COMPILEOPT=JIT_FRAGMENTATION_FIX
    

Problem conclusion

  • This defect will be fixed in:
    1.4.2 SR13 FP6
    .
    JIT causes fragmentation in the JVM subpool on heavy
    applications with peculiar JIT compilation patterns (for
    example, reduced MMI threshold). The problem is fixed in JIT.
    .
    To obtain the fix:
    Install build 20100821 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    PM19671

  • Reported component name

    JAVA(1.3/1.4 CO

  • Reported component ID

    5648C9800

  • Reported release

    42A

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-08-03

  • Closed date

    2010-08-25

  • Last modified date

    2010-08-25

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    PM20703

Fix information

  • Fixed component name

    JAVA(1.3/1.4 CO

  • Fixed component ID

    5648C9800

Applicable component levels

  • R42A PSN

       UP

  • R42L PSN

       UP

  • R42W PSN

       UP

  • R420 PSN

       UP



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Document information


More support for:

z/OS family

Software version:

1.4.2

Reference #:

PM19671

Modified date:

2010-08-25

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