[jbossts-issues] [JBoss JIRA] (JBTM-2990) ThreadUtil performance improvement

Jonathan Halliday (JIRA) issues at jboss.org
Tue Feb 6 09:52:00 EST 2018

Jonathan Halliday created JBTM-2990:

             Summary: ThreadUtil performance improvement
                 Key: JBTM-2990
                 URL: https://issues.jboss.org/browse/JBTM-2990
             Project: JBoss Transaction Manager
          Issue Type: Enhancement
          Components: Transaction Core
    Affects Versions: 5.7.2.Final
            Reporter: Jonathan Halliday
            Assignee: Jonathan Halliday
            Priority: Minor

The ThreadUtil changes introduced for the bug fix under JBTM-2673, cause lock contention on the static WeakHashMap under high load.

The proposed fix is to partially reintroduce the earlier behavior of caching the value in a ThreadLocal, since the dominant use case is pooled threads repeatedly looking up their own identity. The global lookup capability introduced for the fix remains necessary for less common use cases, but the locking can be taken off the critical path for most workloads.

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