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From "Stefan Zeller (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LANG-523) StrBuilder is slow
Date Fri, 21 Aug 2009 12:13:14 GMT

     [ https://issues.apache.org/jira/browse/LANG-523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Stefan Zeller updated LANG-523:
-------------------------------

    Attachment: patch.txt
                Test.java

Test class and patch attached

> StrBuilder is slow
> ------------------
>
>                 Key: LANG-523
>                 URL: https://issues.apache.org/jira/browse/LANG-523
>             Project: Commons Lang
>          Issue Type: Improvement
>    Affects Versions: 2.4
>            Reporter: Stefan Zeller
>         Attachments: patch.txt, Test.java
>
>
> I need a faster StringBuffer for java 1.4 branch.
> So I tested StrBuffer. The result is not sufficient as it is 500 times slower than StringBuffer.
The problem is that currently the StrBuilder increases the buffer size by the length of the
string that thought to be appended.
> Changing this strategy to provide the double of the needed buffer size brings the performance
near to the StringBuilder.
> Here the times (the average of four runs in ms) for the Testcase attached. Where MyStrBuilder
is the pathed version of StrBuilder
> startStringBuffer: 	105.25
> startStrBuilder:	5863.75
> startStringBuilder:	55
> startMyStringBuilder: 	54

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