[jira] Updated: (LANG-523) StrBuilder is slow

["Henri Yandell (JIRA)" <ji...@apache.org>]

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

Henri Yandell updated LANG-523:
-------------------------------

    Fix Version/s: 2.x
                   3.0

Confirmed.

> 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
>             Fix For: 3.0, 2.x
>
>         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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