[jira] Updated: (TAPESTRY-2530) Possible Performance Bottleneck in PageSource.makeObject()

["Stefan Koelmann (JIRA)" <de...@tapestry.apache.org>]

     [ https://issues.apache.org/jira/browse/TAPESTRY-2530?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Stefan Koelmann updated TAPESTRY-2530:
--------------------------------------

    Attachment: threaddump.zip

Thread dump illustrating the problem with the locked threads.

> 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 lock.
> 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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