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From "Emmanuel Lecharny (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 13:50:27 GMT

    [ https://issues.apache.org/jira/browse/DIRMINA-681?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12830941#action_12830941
] 

Emmanuel Lecharny commented on DIRMINA-681:
-------------------------------------------

Yes, we have reached the very same state even when the selector is not switched.

Strange enough, after a certain number of exchanged messages, it stall completely. Som trace
I got shown that he clients socket are doing nothing. I didn't had tie last week to check
what was going on, but this is really strange. 

The fix was introduced to remove the blocked selector, and it works, but there is something
wrong in another area. There is another JIRA opened for these probelms :
https://issues.apache.org/jira/browse/DIRMINA-762

> 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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