IV28217: PERFORMANCE REGRESSION WITH HEAVY USE OF SYSTEM.IDENTITYHASHCODE() AFTER APPLYING IV31689

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

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

Local fix

Problem summary

  • The algorithm used by identity hashcode was modified in Java 626
    sr2 and Java 7 sr1 which introduced a performance regression
    with heavy use of System.identityHashCode() or the default
    Object.hashCode() methods.
    

Problem conclusion

  • This defect will be fixed in:
    6.0.1 SR4
    7.0.0 SR3
    .
    Identity hashcode was modified to use a faster algorithm.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IV28217

  • 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

    2012-09-20

  • Closed date

    2012-09-27

  • Last modified date

    2012-11-09

  • 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 #:

IV28217

Modified date:

2012-11-09

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