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From "Knut Anders Hatlen (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (DERBY-5068) Investigate increased CPU usage on client after introduction of UTF-8 CcsidManager
Date Fri, 20 May 2011 09:51:47 GMT

     [ https://issues.apache.org/jira/browse/DERBY-5068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Knut Anders Hatlen resolved DERBY-5068.
---------------------------------------

          Resolution: Fixed
       Fix Version/s: 10.9.0.0
            Assignee: Knut Anders Hatlen
    Issue & fix info:   (was: [Patch Available])

Committed revision 1125299.

> Investigate increased CPU usage on client after introduction of UTF-8 CcsidManager
> ----------------------------------------------------------------------------------
>
>                 Key: DERBY-5068
>                 URL: https://issues.apache.org/jira/browse/DERBY-5068
>             Project: Derby
>          Issue Type: Task
>    Affects Versions: 10.7.1.1
>            Reporter: Knut Anders Hatlen
>            Assignee: Knut Anders Hatlen
>             Fix For: 10.9.0.0
>
>         Attachments: d5068-1a.diff, d5068-2a.diff, d5068-2a.stat, d5068-2b.diff
>
>
> While looking at the performance graphs for the single-record select test during the
last year - http://home.online.no/~olmsan/derby/perf/select_1y.html - I noticed that there
was a significant increase (10-20%) in CPU usage per transaction on the client early in October
2010. To be precise, the increase seems to have happened between revision 1004381 and revision
1004794. In that period, there were three commits: two related to DERBY-4757, and one related
to DERBY-4825 (tests only).
> We should try to find out what's causing the increased CPU usage and see if there's some
way to reduce it.

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