[jira] Resolved: (HARMONY-4051) [classlib][luni] Performance improvement of java.util.BitSet

["Tim Ellison (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HARMONY-4051?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Tim Ellison resolved HARMONY-4051.
----------------------------------

    Resolution: Fixed

Thanks Robert.

I applied a modified version of your code to the LUNI module at repo revision r545213.

Beside cosmetic/style changes, I also reduce the visibility of #getActualArrayLength and #pop methods to private since they cannot be part of the public API.

Please check that the commit resolves this issue for you.


> [classlib][luni] Performance improvement of java.util.BitSet
> ------------------------------------------------------------
>
>                 Key: HARMONY-4051
>                 URL: https://issues.apache.org/jira/browse/HARMONY-4051
>             Project: Harmony
>          Issue Type: Improvement
>          Components: Classlib
>            Reporter: Robert Hu
>            Assignee: Tim Ellison
>         Attachments: BitSetTest.golden.ser, HARMONY-4051.diff, patch.sh
>
>
> The performance of java.util.BitSet can be improved.
> After some modification, the performance is improved:
> By running unit test of BitSet for 2000 times,  the time can be reduced from 40.671s to 39.813s.
> At the same time, this improvement also fix a problem of serialization.
> Some test cases were also added, to ensure the correctness of improvement.

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