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From "Yonik Seeley (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-1607) String.intern() faster alternative
Date Sun, 19 Apr 2009 18:18:47 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 a completely lockless and memory barrier free intern() cache.
This default would be more back compatible since programs may rely on String instances being
interned via String.intern().

It does not yet include corresponding Lucene code changes to use the StringInterner.

Thoughts?

> 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
>
>
> 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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