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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DERBY-2327) Reduce monitor contention in LockSet
Date Fri, 23 Mar 2007 09:18:32 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: niagara-join.png
                8cpu-join.png
                2cpu-join.png

Also attaching throughput graphs for an identical configuration, only that it uses the 1000x10000
primary key joins in the DERBY-1961 test client. This load is more lock intensive than the
single-record select load, and the effect of the patch is therefore greater. All configurations
show improved throughput for concurrent connections (and some show improvement even in the
single-user case).

> 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
>         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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