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From "Noble Paul (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-1607) String.intern() faster alternative
Date Mon, 24 Aug 2009 08:46:59 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12746773#action_12746773
] 

Noble Paul commented on LUCENE-1607:
------------------------------------

isn't it possible to make the call to 
{code}
public String intern(char[] arr, int offset, int len) {
}
{code}
not create a String? 
currently , if I have a char[] it ends up creating a String (which makes a copy of the char[])
before it does the intern() operation.


> 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
>            Assignee: Yonik Seeley
>             Fix For: 2.9
>
>         Attachments: intern.patch, LUCENE-1607-contrib.patch, LUCENE-1607.patch, LUCENE-1607.patch,
LUCENE-1607.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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