IV30048: POOR DEFAULT PERFORMANCE FOR SOME APPLICATIONS ON LINUX PLATFORM S WITH THE COMPLETELY FAIR SCHEDULER(CFS) IN DEFAULT MODE

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APAR status

  • Closed as program error.

Error description

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

Local fix

  • Setting sched_compat_yield=1 as recommended in the diagnostic
    guide
    

Problem summary

  • On linux platforms with the Completely Fair Scheduler (CFS) in
    default mode (sched_compat_yield=1) the JVMs default spinning
    behavior resulted in sub-optimal performance for some
    applications.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.1 SR4
    7.0.0 SR3
    .
       The default behavior was changed to provide better default
    performance for these applications. In rare cases where this
    change is not beneficial -Xthr:noCfsYield can be used to revert
    to the previous behavior.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV30048

  • 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

    2012-10-12

  • Closed date

    2012-10-12

  • Last modified date

    2012-11-11

  • 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 #:

IV30048

Modified date:

2012-11-11

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