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From "Thomas Mueller (JIRA)" <j...@apache.org>
Subject [jira] Commented: (JCR-1112) CacheManager interval between recalculation of cache sizes should be configurable
Date Fri, 07 Sep 2007 04:14:28 GMT

    [ https://issues.apache.org/jira/browse/JCR-1112?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12525588
] 

Thomas Mueller commented on JCR-1112:
-------------------------------------

> and all I see in the logs is resizeAll() messages

Don't blame the messenger. Seeing the messages doesn't mean this is the problem. The messages
are disabled in the trunk.

Do you have some profiling data?

> CacheManager interval between recalculation of cache sizes should be configurable
> ---------------------------------------------------------------------------------
>
>                 Key: JCR-1112
>                 URL: https://issues.apache.org/jira/browse/JCR-1112
>             Project: Jackrabbit
>          Issue Type: New Feature
>          Components: core
>            Reporter: Przemo Pakulski
>            Priority: Minor
>         Attachments: JCR-1112.txt
>
>
> Currently interval between recaluclation of cahce size is hard coded to 1000 ms. Resizing/recalculation
of cache size is quite expensive method (especially getMemoryUsed on MLRUItemStateCache is
time consuming)
> Depending on the configuration, we realized that under some load up to 10-15% percent
of CPU time (profiler metrics) could be spend doing such recalculations. It does not seem
to be needed to resize cache every second. Best this interval should be configurable in external
config. file with other cache settings (like memory sizes).

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