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  1. Derby
  2. DERBY-1704 Allow more concurrency in the lock manager
  3. DERBY-2327

Reduce monitor contention in LockSet

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Details

    • Sub-task
    • Status: Closed
    • Minor
    • Resolution: Fixed
    • 10.3.1.4
    • 10.3.1.4
    • Services
    • None
    • Performance

    Description

      When multiple threads enter the lock manager, only one can access the hash table in LockSet. To improve scalability on multiple CPUs, it should be possible to have more than one thread accessing the lock table at the same time.

      Attachments

        1. ConcurrentHashMap.diff
          13 kB
          Knut Anders Hatlen
        2. derby-2327-1a.diff
          25 kB
          Knut Anders Hatlen
        3. derby-2327-1a.stat
          0.5 kB
          Knut Anders Hatlen
        4. derby-2327-2a.diff
          15 kB
          Knut Anders Hatlen
        5. derby-2327-2a.stat
          0.1 kB
          Knut Anders Hatlen
        6. derby-2327-3a.diff
          1 kB
          Knut Anders Hatlen
        7. derby-2327-4a.diff
          33 kB
          Knut Anders Hatlen
        8. derby-2327-4a.stat
          0.4 kB
          Knut Anders Hatlen
        9. 2cpu-select.png
          5 kB
          Knut Anders Hatlen
        10. 8cpu-select.png
          5 kB
          Knut Anders Hatlen
        11. niagara-select.png
          5 kB
          Knut Anders Hatlen
        12. 2cpu-join.png
          5 kB
          Knut Anders Hatlen
        13. 8cpu-join.png
          5 kB
          Knut Anders Hatlen
        14. niagara-join.png
          5 kB
          Knut Anders Hatlen

        Issue Links

          relates to

          Improvement - An improvement or enhancement to an existing feature or task. DERBY-698 Use Java 5 concurrent collections for better concurrency (rather than synchronized collections)

          • Major - Major loss of function.
          • Closed

          Activity

            People

              knutanders Knut Anders Hatlen
              knutanders Knut Anders Hatlen
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              Dates

                Created:
                Updated:
                Resolved: