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Posted to commits@harmony.apache.org by "Nathan Beyer (JIRA)" <ji...@apache.org> on 2006/06/21 05:04:30 UTC
[jira] Commented: (HARMONY-630) Performance improvement for
BufferedReader and LineNumberReader classes
[ http://issues.apache.org/jira/browse/HARMONY-630?page=comments#action_12417024 ]
Nathan Beyer commented on HARMONY-630:
--------------------------------------
Were the numbers posted backwards? The original values seems better than the patch values. Also, what's the unit of measure for these results? Seconds, milliseconds?
> Performance improvement for BufferedReader and LineNumberReader classes
> -----------------------------------------------------------------------
>
> Key: HARMONY-630
> URL: http://issues.apache.org/jira/browse/HARMONY-630
> Project: Harmony
> Type: Improvement
> Components: Classlib
> Reporter: Vladimir Strigun
> Assignee: Nathan Beyer
> Priority: Minor
> Attachments: Harmony-630.patch
>
> Analysis of BufferedReader and LineNumberReader was made by our team. These classes are widely used and it's recommended, for instance, that any character IO should go through BufferedReader for better performance. Therefore it should perform well and should not itself be a bottleneck.
> We have identified opportunity to increase performance of mentioned classes. Publicly available bench DaCapo[1] was used for performance measurement and we found that DaCapo:hsqldb benchmark performance can be improved within small modification of java.io.BufferedReader and java.io.LineNumberReader classes. Main idea of the patch (I will attach it soon) is to remove StringBuilder allocation from "malloc"-hot methods readLine.
> Here is result of DaCapo execution with patched and original versions of classlib+J9:
> Build Dacapo: fop Dacapo: hsqldb Dacapo: xalan Dacapo: chart
> original 712.020 27232.647 4201.449 22573.192
> patched 715.152 26703.966 4161.018 22580.771
> [1] http://www-ali.cs.umass.edu/DaCapo/gcbm.html
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