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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-2327) Reduce monitor contention in LockSet
Date Mon, 12 Mar 2007 14:52:09 GMT

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

Knut Anders Hatlen updated DERBY-2327:

    Attachment: derby-2327-2a.stat

Attaching a new refactoring patch (2a). The patch moves all the methods from SinglePool to
a new abstract class called AbstractPool. AbstractPool is now the super-class of SinglePool.
The only code left in SinglePool is the creation of the LockSet instance. The purpose of the
patch is to make it easier to create a new LockFactory class which is identical to SinglePool
except that it uses another LockSet implementation.

To apply the patch, first issue this command:

  svn cp java/engine/org/apache/derby/impl/services/locks/SinglePool.java java/engine/org/apache/derby/impl/services/locks/AbstractPool.java

All the tests passed on Solaris 10, Sun Java SE 6.

> 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:
>            Reporter: Knut Anders Hatlen
>         Assigned To: Knut Anders Hatlen
>            Priority: Minor
>         Attachments: ConcurrentHashMap.diff, derby-2327-1a.diff, derby-2327-1a.stat,
derby-2327-2a.diff, derby-2327-2a.stat
> 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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