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From "Earwin Burrfoot (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1607) String.intern() faster alternative
Date Tue, 05 May 2009 18:05:30 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12706129#action_12706129
] 

Earwin Burrfoot commented on LUCENE-1607:
-----------------------------------------

Bug in previous algo (unbounded hash):

      // check cached hashCode first, and use compareTo to avoid
      // dynamic type checking in equals().
      if (h == other.hashCode() && s.compareTo(other)==0) {
        return s;          <--- here we should return 'other'
      }


> String.intern() faster alternative
> ----------------------------------
>
>                 Key: LUCENE-1607
>                 URL: https://issues.apache.org/jira/browse/LUCENE-1607
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Earwin Burrfoot
>             Fix For: 2.9
>
>         Attachments: intern.patch, LUCENE-1607.patch, LUCENE-1607.patch, LUCENE-1607.patch,
LUCENE-1607.patch, LUCENE-1607.patch, LUCENE-1607.patch, LUCENE-1607.patch
>
>
> By using our own interned string pool on top of default, String.intern() can be greatly
optimized.
> On my setup (java 6) this alternative runs ~15.8x faster for already interned strings,
and ~2.2x faster for 'new String(interned)'
> For java 5 and 4 speedup is lower, but still considerable.

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