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https://issues.apache.org/jira/browse/TAP5-945?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Howard M. Lewis Ship closed TAP5-945.
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Resolution: Fixed
Fix Version/s: 5.2.0.0
The synchronization logic is only present for JDK 1.5 now; for JDK 1.6 or
above, no extra synchronization occurs.
> Unnecessary and severe lock contention in PerthreadManagerImpl
> --------------------------------------------------------------
>
> Key: TAP5-945
> URL: https://issues.apache.org/jira/browse/TAP5-945
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.1.0.5
> Reporter: Olle Hallin
> Assignee: Howard M. Lewis Ship
> Priority: Minor
> Fix For: 5.2.0.0
>
>
> When load testing our new high-volume site before soft launch, we found that
> we have severe lock contention in
> org.apache.tapestry5.ioc.internal.services.PerthreadManagerImpl.
> It synchronizes on "this" before invoking ThreadLocal.get() and
> ThreadLocal.remove(), which I believe is unnecessary.
> During our tests, approximately 35% of all Tomcat threads were waiting for
> this lock in any of 10 thread dumps taken 15 seconds apart.
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