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Posted to commits@harmony.apache.org by "Geir Magnusson Jr (JIRA)" <ji...@apache.org> on 2006/07/19 16:31:33 UTC
[jira] Updated: (HARMONY-647) [drlvm] performance improvement for
String class
[ http://issues.apache.org/jira/browse/HARMONY-647?page=all ]
Geir Magnusson Jr updated HARMONY-647:
--------------------------------------
Component/s: DRLVM
(was: VM)
> [drlvm] performance improvement for String class
> ------------------------------------------------
>
> Key: HARMONY-647
> URL: http://issues.apache.org/jira/browse/HARMONY-647
> Project: Harmony
> Issue Type: Improvement
> Components: DRLVM
> Reporter: Vladimir Strigun
> Priority: Minor
> Attachments: Harmony-647.patch
>
>
> I'd like to suggest performance improvement for String class. Attached patch is very simple and covers the following issues:
> - Additional check in String.equals(). It returns true in case if we compare the same strings.
> - Deleted temporary variable sum in String.hashCode()
> - Added workaround for charset ISO-8859-1 in String.getBytes() to avoid usage of java.nio
> I've execute DaCapo benchmark with the fix gives about 7% boost for Dacapo:fop bench and don't degradate on other benchmarks. Values are in milliseconds:
> Build Dacapo:fop Dacapo:hsqldb Dacapo:xalan Dacapo:chart
> drlvm-original 1287.076 12706.837 1933.424 16283.142
> drlvm-fixed 1186.912 12471.263 1914.366 15961.693
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