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From "Takayuki Kaneko (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DBCP-239) Performance bottleneck on Abandoned Object Pool
Date Sun, 02 Sep 2007 16:51:19 GMT

     [ https://issues.apache.org/jira/browse/DBCP-239?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Takayuki Kaneko updated DBCP-239:
---------------------------------

    Attachment: patch.txt

patch for this issue.

> Performance bottleneck on Abandoned Object Pool
> -----------------------------------------------
>
>                 Key: DBCP-239
>                 URL: https://issues.apache.org/jira/browse/DBCP-239
>             Project: Commons Dbcp
>          Issue Type: Improvement
>    Affects Versions: 1.3
>            Reporter: Takayuki Kaneko
>         Attachments: patch.txt
>
>
> AbandonedObjectPool uses ArrayList as trace variable to manage connections.
> I found a bottleneck on it.
> returnObject(Object) has a synchronized block and it will be a bottleneck if it manages
a lot of connections.
> ArrayList#remove(Object) has to do arraycopy each time. It is tuned by native code, but
it is still slower than LinkedList#remove(Object).
> IMO, the list doesn't access by index, so LinkedList is better than ArrayList.

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