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From Regis <xu.re...@gmail.com>
Subject Re: [jira] Commented: (HARMONY-6045) [classlib] [luni] Optimize java.lang.String.toUpperCase(), String.toLowerCase() and String sharing for more performance gains
Date Thu, 16 Apr 2009 09:49:29 GMT
Kevin Zhou wrote:
> Previously, it is proved by using benchmarks like Specjbb.
> Since it's been a long time I don't really remember the accurate statistics
> of how much improvements it brings.
All right, I will try to write some micro benchmarks :)
> 
> On Thu, Apr 16, 2009 at 5:18 PM, Regis Xu (JIRA) <jira@apache.org> wrote:
> 
>>    [
>> https://issues.apache.org/jira/browse/HARMONY-6045?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12699595#action_12699595]
>>
>> Regis Xu commented on HARMONY-6045:
>> -----------------------------------
>>
>> Hi Kevin,
>>
>> This patch is interesting, do you have any benchmark to prove the
>> improvement?
>>
>>> [classlib] [luni] Optimize java.lang.String.toUpperCase(),
>> String.toLowerCase() and String sharing for more performance gains
>> -----------------------------------------------------------------------------------------------------------------------------
>>>                 Key: HARMONY-6045
>>>                 URL: https://issues.apache.org/jira/browse/HARMONY-6045
>>>             Project: Harmony
>>>          Issue Type: Improvement
>>>          Components: Classlib
>>>    Affects Versions: 5.0M8
>>>            Reporter: Kevin Zhou
>>>             Fix For: 5.0M9
>>>
>>>         Attachments: HARMONY-6045.diff
>>>
>>>   Original Estimate: 24h
>>>  Remaining Estimate: 24h
>>>
>>> Recently, I make some improvement on java.lang.String and
>> java.lang.AbstractStringBuilder class for more performance gains.
>>> 1. Move the share mode for all the AbstractStringBuilder.append method,
>> since the append never change the share things.
>>> 2. Move the share mode in AbstractStringBuilder.setLength method
>>> 3. Add the special care for the ASCII things, especially on case things
>> of String.toUpperCase and to LowerCase methods.
>>
>> --
>> This message is automatically generated by JIRA.
>> -
>> You can reply to this email to add a comment to the issue online.
>>
>>
> 


-- 
Best Regards,
Regis.

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