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From "Mauritz Lovgren (JIRA)" <j...@apache.org>
Subject [jira] Commented: (DIRMINA-681) Strange CPU peak occuring at fixed interval when several thousand connections active
Date Mon, 08 Feb 2010 13:36:27 GMT

    [ https://issues.apache.org/jira/browse/DIRMINA-681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830938#action_12830938
] 

Mauritz Lovgren commented on DIRMINA-681:
-----------------------------------------

Hm. Still having problems running on the RC2-SNAPSHOT (from trunk as of today). Running on
RC1 (final), no problems (except the strange CPU peak as described in the issue description
every 10-15 minutes).

Running on RC2-SNAPSHOT, messages time out during delivery between server and client. They
seem to stall, whereafter no traffic passes through the proxy at all. Switching back to RC1
and the problem is gone.

When running the test to prove that the CPU peak issue, I need at least a couple of thousand
client connections. Currently, the proxy stops handling messages after a few hundred (not
been able to connect more than 1000 clients through the proxy with RC2 yet before everything
stalls).

Could there be a performance issue with your fix?

> Strange CPU peak occuring at fixed interval when several thousand connections active
> ------------------------------------------------------------------------------------
>
>                 Key: DIRMINA-681
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-681
>             Project: MINA
>          Issue Type: Task
>          Components: Core
>    Affects Versions: 2.0.0-M4, 2.0.0-RC1
>         Environment: Windows Vista Ultimate 64-bit (on 64-bit Sun JDK 1.6.0_18). Intel
Core 2 Quad Core Q9300 2,5 GHz, 8 GB RAM
>            Reporter: Mauritz Lovgren
>             Fix For: 2.0.0
>
>         Attachments: screenshot-1.jpg, screenshot-2.jpg, screenshot-3.jpg, screenshot-4.jpg
>
>
> Observing strange CPU activity occuring at regular (seemingly fixed) interval with no
protocol traffic activity.
> See attached window capture of task manager that shows this with 3000 active connections.
> Is there some kind of cleanup occuring within MINA core at a predefined interval?
> The 3000 connections in the example above connects within 250 seconds. A normal situation
would be that these connections are established over a longer period of time, perhaps spreading
the CPU peaks shown above as well, flattening the curve.

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