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Jochen Kemnade commented on TAP5-2337:
--------------------------------------
{quote}
Mentioned patches don't reduce number of GCed StringBuilder/String objects.
{quote}
No, they don't, but they reduce the number of calls to {{StrinngBuilder.expandCapacity}} (which
this issue was about originally ;-)).
{quote}
May be we can wait until Java8 to improve GC-related things w/o breaking API?
{quote}
I guess that will be the best option.
> 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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