[jira] Closed: (DERBY-2327) Reduce monitor contention in LockSet

["Knut Anders Hatlen (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DERBY-2327?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Knut Anders Hatlen closed DERBY-2327.
-------------------------------------

    Resolution: Fixed

Re-closing the issue due to lack of feedback. If there still is a build problem, please open a new JIRA issue and provide more details.

> Reduce monitor contention in LockSet
> ------------------------------------
>
>                 Key: DERBY-2327
>                 URL: https://issues.apache.org/jira/browse/DERBY-2327
>             Project: Derby
>          Issue Type: Sub-task
>          Components: Performance, Services
>    Affects Versions: 10.3.0.0
>            Reporter: Knut Anders Hatlen
>         Assigned To: Knut Anders Hatlen
>            Priority: Minor
>             Fix For: 10.3.0.0
>
>         Attachments: 2cpu-join.png, 2cpu-select.png, 8cpu-join.png, 8cpu-select.png, ConcurrentHashMap.diff, derby-2327-1a.diff, derby-2327-1a.stat, derby-2327-2a.diff, derby-2327-2a.stat, derby-2327-3a.diff, derby-2327-4a.diff, derby-2327-4a.stat, niagara-join.png, niagara-select.png
>
>
> 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.

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