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From "Michael Mikhulya (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAP5-2337) Reduce number of calls of AbstractStringBuilder.expandCapacity
Date Sat, 01 Aug 2015 18:35:04 GMT

    [ https://issues.apache.org/jira/browse/TAP5-2337?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14650496#comment-14650496

Michael Mikhulya commented on TAP5-2337:

According to [^Tapestry-StringBuilder.png] StringBuilder is in the top of GCed objects.
Mentioned patches don't reduce number of GCed StringBuilder/String objects.

May be we can wait until Java8 to improve GC-related things w/o breaking API?
Or make rather minor API change during release 5.4 if it is possible. 

> Reduce number of calls of AbstractStringBuilder.expandCapacity
> --------------------------------------------------------------
>                 Key: TAP5-2337
>                 URL: https://issues.apache.org/jira/browse/TAP5-2337
>             Project: Tapestry 5
>          Issue Type: Improvement
>            Reporter: Michael Mikhulya
>            Priority: Minor
>              Labels: patch, performance
>         Attachments: 0001-TAP5-2337-Reduce-number-of-calls-of-AbstractStringBu-jk.patch,
0001-TAP5-2337-Reduce-number-of-calls-of-AbstractStringBu.patch, Tapestry-StringBuilder.png
> During profiling of Tapestry framework I found that AbstractStringBuilder.expandCapacity
is called very frequently.
> There is a patch that get rid of creation StringBuilder with following calls of expandCapacity
(which allocate memory and copy current content into it).
> I have to thank Dmitriy Ilyin, who helped me to investigate the issue and to find the
simplest solution (actually we get a little bit less code while improving performance).
> With this improvement time per request decreased on 0.5ms (1% of overall time)on our
test. All measurements were done with apache benchmark after warm up phase.

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