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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-1607) String.intern() faster alternative
Date Mon, 20 Apr 2009 20:30:47 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-1607?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Yonik Seeley updated LUCENE-1607:
---------------------------------

    Attachment: LUCENE-1607.patch

Here's another version that uses closed hashing and table resizes to cache all interned strings
requested.  It remains lock free and memory barrier free on the read side.

> 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
>
>
> 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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