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Posted to dev@jackrabbit.apache.org by "Ard Schrijvers (JIRA)" <ji...@apache.org> on 2007/12/02 12:26:43 UTC

[jira] Commented: (JCR-1251) DescendantSelfAxisQuery creates too many object instances

    [ https://issues.apache.org/jira/browse/JCR-1251?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12547613 ] 

Ard Schrijvers commented on JCR-1251:
-------------------------------------

40% !! That is quite some performance gain, very nice. I did see quite some CPU time in array list calls during DescendantSelfAxis tests (11% or something I saw was spend in the init() only). 

+1 obviously!

> DescendantSelfAxisQuery creates too many object instances
> ---------------------------------------------------------
>
>                 Key: JCR-1251
>                 URL: https://issues.apache.org/jira/browse/JCR-1251
>             Project: Jackrabbit
>          Issue Type: Improvement
>          Components: jackrabbit-core, query
>            Reporter: Christoph Kiehl
>            Assignee: Christoph Kiehl
>            Priority: Minor
>             Fix For: 1.4
>
>         Attachments: DescendantSelfAxisQuery-patch.txt
>
>
> In DescendantSelfAxisQuery.DescendantSelfAxisScorer.isValid() there is an ArrayList and an Integer instance created on every call. Since this method gets called really often during queries the object creation/gc affects performance.

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