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From "Olle Hallin (JIRA)" <j...@apache.org>
Subject [jira] Created: (TAP5-945) Lock contention in PerthreadManagerImpl
Date Tue, 08 Dec 2009 13:33:18 GMT
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:
            Reporter: Olle Hallin
            Priority: Minor

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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