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From "Andreas Andreou (JIRA)" <...@tapestry.apache.org>
Subject [jira] Commented: (TAPESTRY-2530) Possible performance bottleneck in PageSource.makeObject()
Date Wed, 23 Jul 2008 13:59:31 GMT

    [ https://issues.apache.org/jira/browse/TAPESTRY-2530?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12616024#action_12616024

Andreas Andreou commented on TAPESTRY-2530:

I went over the commit logs - possible performance related changes between 4.1.3 and now are
at revisions:
r595338, r613299, r614722 and r646069

Looking at them from http://svn.apache.org/viewvc?view=rev&revision=646069

> Possible performance bottleneck in PageSource.makeObject()
> ----------------------------------------------------------
>                 Key: TAPESTRY-2530
>                 URL: https://issues.apache.org/jira/browse/TAPESTRY-2530
>             Project: Tapestry
>          Issue Type: Bug
>    Affects Versions: 4.1.2
>         Environment: JDK 1.5.0_14 64 bit, Tomcat 5.5.26
>            Reporter: Stefan Koelmann
>            Priority: Critical
>         Attachments: threaddump.zip
> We recently migrated from Tapestry 3 to Tapestry 4.1.2 and are experiencing severe performance
problems with mediocre load.
> At some point our servers start creating new threads until the Tomcat reaches the maximum
of 500 live threads. When examining the thread dump, we find one thread holding a lock at
the GenericKeyedObjectPool, while hundreds of other threads are waiting to aquire just this
> It seems the locking thread is constructig a page from a synchronized context and needs
some time to do so, and this leads to the complete application locking up in no time. See
the threaddump attached.
> We already tried an upgrade to commons-pool 1.4 with no real effect.

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