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IV19633: LOCK PERFORMANCE DEGRADATION

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APAR status

  • Closed as program error.

Error description

  • Error Message: N/A
    .
    Stack Trace: N/A
    .
    Lower performance than Java 6 when running Daytrader benchmark
    with a high number of clients (around 100).
    

Local fix

  • Pass in -Xthr:secondarySpinForObjectMonitors as a JVM option.
    

Problem summary

  • This problem is caused due to a different internal lock
    acquisition behavior when waking up from Object.wait(). It is
    noticeable in applications which use wait/notify heavily.
    

Problem conclusion

  • This defect will be fixed in:
    7.0.0 SR1
    6.0.1 SR2
    .
    The JVM's lock acquisition algorithm was modified to avoid the
    problem.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV19633

  • 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

    2012-04-12

  • Closed date

    2012-04-12

  • Last modified date

    2012-04-12

  • 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



Document information

More support for: Runtimes for Java Technology
Virtual Machine

Software version: 260

Reference #: IV19633

Modified date: 12 April 2012