[jira] [Created] (JAMES-3652) Avoid locking in protocol task execution

["Benoit Tellier (Jira)" <se...@james.apache.org>]

Benoit Tellier created JAMES-3652:
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             Summary: Avoid locking in protocol task execution
                 Key: JAMES-3652
                 URL: https://issues.apache.org/jira/browse/JAMES-3652
             Project: James Server
          Issue Type: Improvement
          Components: IMAPServer, POP3Server, SMTPServer
    Affects Versions: 3.6.0
            Reporter: Benoit Tellier
             Fix For: 3.7.0
         Attachments: with-lock.png, without-lock.png

I found out the JMX executor wrapper of the Netty protocol transport layer was doing locks (synchronized lists and synchronized blocks).

On a regular SMTP worload (5000 mails of 500 KB) we spent 12.9% of CPU cycles doing locks... (See attached flame graphs)

We can easily implement the very same feature without any lock.







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