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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 13:40:28 GMT

    [ https://issues.apache.org/jira/browse/DIRMINA-681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830939#action_12830939
] 

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

FYI, the following occurs while running the load test (as far as I got anyway before stuff
stalls)..:

14:20:36,000 WARN  Create a new selector. Selected is 0, delta = 0 [NioProcessor-9] (AbstractPollingIoProcessor.java:1075)
14:29:45,788 WARN  Create a new selector. Selected is 0, delta = 0 [NioProcessor-10] (AbstractPollingIoProcessor.java:1075)
14:29:45,788 WARN  Create a new selector. Selected is 0, delta = 0 [NioProcessor-6] (AbstractPollingIoProcessor.java:1075)
14:29:45,788 WARN  Create a new selector. Selected is 0, delta = 0 [NioProcessor-7] (AbstractPollingIoProcessor.java:1075)
14:29:45,803 WARN  Create a new selector. Selected is 0, delta = 0 [NioProcessor-6] (AbstractPollingIoProcessor.java:1075)

Further, clients are able to connect at same rate as with RC1 for a few minutes, until suddenly
the server (NIO acceptor / connections) seems to reach some strange state, causing message
flow to slow down / stop.

> 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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