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From "Thiago H. de Paula Figueiredo (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (TAP5-2333) Decrease number of ThreadLocal.get calls
Date Wed, 21 May 2014 19:16:40 GMT

    [ https://issues.apache.org/jira/browse/TAP5-2333?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14005117#comment-14005117
] 

Thiago H. de Paula Figueiredo commented on TAP5-2333:
-----------------------------------------------------

It's very hard to spot the differences between the new suggested tracker and the old one because
they're different files. It makes it a very, very, very hard patch to accept.

> Decrease number of ThreadLocal.get calls
> ----------------------------------------
>
>                 Key: TAP5-2333
>                 URL: https://issues.apache.org/jira/browse/TAP5-2333
>             Project: Tapestry 5
>          Issue Type: Improvement
>            Reporter: Michael Mikhulya
>              Labels: performance
>         Attachments: 0001-TAP5-2333-Decrease-number-of-ThreadLocal.get-calls.patch, 0002-TAP5-2333-Decrease-number-of-ThreadLocal.get-calls.patch
>
>
> During profiling I found that ThreadLocal.get is a very hot method call.
> Most frequently it is called from PerThreadOperationTracker.
> PerThreadOperationTracker can be replaced with SimpleOperationTracker which I introduced
in a patch.
> SimpleOperationTracker only prints exception without "operations trace".
> "Operations trace" can be useful during debug. So in my patch PerThreadOperationTracker
is used in debug mode, but otherwise SimpleOperationTracker is used.
> Please check whether this decision is good for most cases.
> Performance gains are very serious. 
> Time per request decreased on 11ms (23% of overall time).
> All measurements are done with apache benchmark after warm up phase.
> Currently my patch breaks two tests:
> CoreBehaviorsTests. event_handler_return_types
> MiscTests. operation_tracking_via_annotation
> Both tests are broken because tests depend on 'Operation description' which is ignored
by SimpleOperationTracker.
> The simplest way to fix tests is to enforce using PerThreadOperationTracker for these
tests.
> I'm not sure whether 'Operation description' is definitely useful especially taking into
account that only 2 tests become broken. We use SimpleOperationTracker on production for several
months already and nobody notice that 'Operation descriptions' are absent. In all cases (for
us) it was enough to see a stack trace of exception in logs.
> See TAP5-2332. There is a huge amount of String.format required to track such 'operation
descriptions'. By removing calculation of such 'operation descriptions' Tapestry can be made
much faster.
> If 'Operation descriptions' is required for some cases than we can introduce some option
to enable/disable this feature.



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