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Posted to xbean-dev@geronimo.apache.org by "Gert Vanthienen (Updated) (JIRA)" <ji...@apache.org> on 2012/03/26 14:42:26 UTC

[jira] [Updated] (XBEAN-203) Performance improvement by adding local cache for MultiParentClassLoader#loadClass

     [ https://issues.apache.org/jira/browse/XBEAN-203?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Gert Vanthienen updated XBEAN-203:
----------------------------------

    Attachment: 0001-XBEAN-203-Performance-improvement-by-adding-local-ca.patch

Attached the output from git format-patch for the change we did to improve performance.
                
> Performance improvement by adding local cache for MultiParentClassLoader#loadClass
> ----------------------------------------------------------------------------------
>
>                 Key: XBEAN-203
>                 URL: https://issues.apache.org/jira/browse/XBEAN-203
>             Project: XBean
>          Issue Type: Improvement
>          Components: classloader
>    Affects Versions: 3.7
>            Reporter: Gert Vanthienen
>         Attachments: 0001-XBEAN-203-Performance-improvement-by-adding-local-ca.patch
>
>
> While profiling for performance issues on ServiceMix, we noticed a lot of time was spent waiting for the object lock to access MultiParentClassLoader's loadClass() method, especially when using things like JAXP.  We managed to get significant improvements by adding a local cache to avoid the synchronized method invocation for previously loaded classes.

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