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From "Jon Folland, Nativ Ltd" <jon.foll...@nativ.tv>
Subject Re: [jira] Commented: (DIRMINA-762) WARN org.apache.mina.core.service.IoProcessor - Create a new selector. Selected is 0, delta = 0
Date Wed, 10 Feb 2010 16:05:28 GMT
Hi All, 

Sorry for this email which will undoubtedly cause frustration. Can somebody please remove
me from the list? The process for unsubscribing fails every time. 

Great technology by the way! 

----- Original Message ----- 
From: "Emmanuel Lecharny (JIRA)" <jira@apache.org> 
To: dev@mina.apache.org 
Sent: Wednesday, 10 February, 2010 16:03:28 GMT +00:00 Monrovia 
Subject: [jira] Commented: (DIRMINA-762) WARN org.apache.mina.core.service.IoProcessor - Create
a new selector. Selected is 0, delta = 0 


[ https://issues.apache.org/jira/browse/DIRMINA-762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12832039#action_12832039
] 

Emmanuel Lecharny commented on DIRMINA-762: 
------------------------------------------- 

Having stripped down all that is irrelevant in this giant patch, I have some interesting parts
: 
- a new atomic flag has been added (wakeupCalled), I don't remember why 
- this is used to protect the part of the code where we try to detect that the epoll is spinning

- I'm wondering if we don't have a race condition here, and stay locked... 

A quick thread dump could help... 

> WARN org.apache.mina.core.service.IoProcessor - Create a new selector. Selected is 0,
delta = 0 
> ------------------------------------------------------------------------------------------------

> 
> Key: DIRMINA-762 
> URL: https://issues.apache.org/jira/browse/DIRMINA-762 
> Project: MINA 
> Issue Type: Bug 
> Environment: Linux (2.6.26-2-amd64), java version 1.6.0_12 and also 1.6.0_18. 
> Reporter: Omry Yadan 
> Priority: Critical 
> Fix For: 2.0.0-RC2 
> 
> Attachments: BufferCodec.java, NettyTestServer.java, RateCounter.java, Screen shot 2010-02-02
at 7.48.39 PM.png, Screen shot 2010-02-02 at 7.48.46 PM.png, Screen shot 2010-02-02 at 7.48.59
PM.png, Screen shot 2010-02-02 at 7.49.13 PM.png, Screen shot 2010-02-02 at 7.49.18 PM.png,
Server.java, StressClient.java 
> 
> 
> Mina server gets into a bad state where it constantly prints : 
> WARN org.apache.mina.core.service.IoProcessor - Create a new selector. Selected is 0,
delta = 0 
> when this happens, server throughput drops significantly. 
> to reproduce run the attached server and client for a short while (30 seconds on my box).


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