IV25689: MXBEAN TOTAL JIT COMPILATION TIME DECREASES

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APAR status

  • Closed as program error.

Error description

  • Error Message: The CompilationMXBean method getCompilationTime()
    may return incorrect data if the system's     calendar time is
    adjusted.
    .
    Stack Trace: N/A
    .
    

Local fix

Problem summary

  • Compilation time measurement may be affected by adjustments to
    the system's calendar time.  The calendar time may be adjusted
    such that the current time is before the last compilation start
    time. In such cases, the difference between current time and
    last compilation start time will be negative, and adding this
    value to the total compilation time will cause the total
    compilation time to decrease.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.0 SR11
    6.0.1 SR3
    7.0.0 SR2
    .
       Monotonic time replaced the calendar time for compilation
    time calculations. Also extra checks for time going backwards
    and timer wraparound are added to VM. In the cases where time
    goes backwards, total compilation time stays same.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV25689

  • Reported component name

    J9 COMMON CODE

  • Reported component ID

    620700127

  • Reported release

    600

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-08-05

  • Closed date

    2012-08-05

  • Last modified date

    2012-09-13

  • 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

  • R600 PSY

       UP

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Virtual Machine

Software version:

6.0

Reference #:

IV25689

Modified date:

2012-09-13

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