IV01844: TOO MUCH CPU CONSUMED DURING STARTUP OF ZWAS WHEN USING MULTIPLE SERVANT REGIONS

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: N/A
    .
    

Local fix

  • The issue can be circumvented by using
    -Xjit:disableGuardedCountingRecompilations
    -Xaot:disableGuardedCountingRecompilations
    

Problem summary

  • When zWAS is using multiple servant regions the JIT mechanism
    that aggressively upgrades method compilations is triggered too
    early leading to extra CPU cycles being consumed during startup.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.1 GA FP1
    .
    The JIT was updated to disable the 'Guarded Counting
    Recompilations' mechanism. Another upgrading mechanism that is
    less aggressive will be in effect.
    .
    To obtain the fix:
    Install build 20110323 or later
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV01844

  • Reported component name

    JIT

  • Reported component ID

    620700124

  • Reported release

    260

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-06-15

  • 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

    JIT

  • Fixed component ID

    620700124

Applicable component levels

  • R260 PSY

       UP



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Document information


More support for:

Runtimes for Java Technology
Just In Time (JIT) Compiler

Software version:

260

Reference #:

IV01844

Modified date:

2011-06-15

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