[jira] Updated: (FELIX-1746) Reduce contention on ServiceRegistry.getServiceReferences(String, Filter)

["Jed Wesley-Smith (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FELIX-1746?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jed Wesley-Smith updated FELIX-1746:
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    Attachment: blocked-threads.gif.jpg

jprofiler screenshot attached

> Reduce contention on ServiceRegistry.getServiceReferences(String, Filter)
> -------------------------------------------------------------------------
>
>                 Key: FELIX-1746
>                 URL: https://issues.apache.org/jira/browse/FELIX-1746
>             Project: Felix
>          Issue Type: Improvement
>          Components: Framework
>    Affects Versions: felix-2.0.0
>            Reporter: Jed Wesley-Smith
>         Attachments: blocked-threads.gif.jpg
>
>
> Performance testing has shown that there is significant contention on the ServiceRegistry object's monitor during startup. This is caused by Spring DM making lots of calls to the synchronized method ServiceRegistry.getServiceReferences(String, Filter). This method is synchronized in order to protect the m_serviceRegsMap HashMap, but the method does a lot more work than simply accessing the map.
> Propose changing the ServiceRegistry to use a thread-safe Map implementation that does not require external synchronization, in particular a CopyOnWriteMap. I will add a patch that includes a CopyOnWriteMap implementation.

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