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From "Vladimir Strigun (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HARMONY-647) [drlvm] performance improvement for String class
Date Fri, 23 Jun 2006 12:12:30 GMT
     [ http://issues.apache.org/jira/browse/HARMONY-647?page=all ]

Vladimir Strigun updated HARMONY-647:
-------------------------------------

    Attachment: Harmony-647.patch

Patch for java/lang/String class

> [drlvm] performance improvement for String class
> ------------------------------------------------
>
>          Key: HARMONY-647
>          URL: http://issues.apache.org/jira/browse/HARMONY-647
>      Project: Harmony
>         Type: Improvement

>   Components: VM
>     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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