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Posted to dev@lucene.apache.org by "P Eger (JIRA)" <ji...@apache.org> on 2009/04/13 20:51:15 UTC
[jira] Updated: (LUCENE-1600) Reduce usage of String.intern(),
performance is terrible
[ https://issues.apache.org/jira/browse/LUCENE-1600?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
P Eger updated LUCENE-1600:
---------------------------
Attachment: intern_perf.patch
intern.png
attaching profiler screenshot and patch
> Reduce usage of String.intern(), performance is terrible
> --------------------------------------------------------
>
> Key: LUCENE-1600
> URL: https://issues.apache.org/jira/browse/LUCENE-1600
> Project: Lucene - Java
> Issue Type: Improvement
> Affects Versions: 2.4, 2.4.1
> Environment: Windows Server 2003 x64
> Hotspot JDK 1.6.0_12 64-bit
> Reporter: P Eger
> Priority: Minor
> Attachments: intern.png, intern_perf.patch
>
>
> I profiled a simple MatchAllDocsQuery() against ~1.5 million documents (8 fields of short text, Field.Store.YES,Field.Index.NOT_ANALYZED_NO_NORMS), then retrieved all documents via searcher.doc(i, fs). String.intern() showed up as a top hotspot (see attached screenshot), so i implemented a small optimization to not intern() for every new Field(), instead forcing the intern in the FieldInfos class and adding a optional "internName" constructor to Field. This reduced execution time for searching and iterating through all documents by 35%. Results were similar for -server and -client.
> TRUNK (2.9) w/out patch: matched 1435563 in 8884 ms/search
> TRUNK (2.9) w/patch: matched 1435563 in 5786 ms/search
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