[jira] Reopened: (DIRMINA-678) NioProcessor 100% CPU usage on Linux (epoll selector bug)

["Emmanuel Lecharny (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/DIRMINA-678?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Emmanuel Lecharny reopened DIRMINA-678:
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Holly cow !

I removed the protection against crazy epoll in 2.0.1 after having discussed the problem with some fellow developpers from HttpComponent, as they told me the problem has been solved in Java 1.6.0_18.

The patch can be found here : http://svn.apache.org/viewvc/mina/branches/2.0.2/mina-core/src/main/java/org/apache/mina/core/polling/AbstractPollingIoProcessor.java?r1=1001894&r2=1006194

Ok, I will reapply it in 2.0.2 and try to release it ASAP.

S Rao, can you confirm the problem is *not* present in 2.0.0 ?

Many thanks !

> NioProcessor 100% CPU usage on Linux (epoll selector bug)
> ---------------------------------------------------------
>
>                 Key: DIRMINA-678
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-678
>             Project: MINA
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0.0-M4
>         Environment: CentOS 5.x, 32/64-bit, 32/64-bit Sun JDK 1.6.0_12, also _11/_10/_09 and Sun JDK 1.7.0 b50, Kernel 2.6.18-92.1.22.el5 and also older versions,
>            Reporter: Serge Baranov
>             Fix For: 2.0.0
>
>         Attachments: snap973.png, snap974.png
>
>
> It's the same bug as described at http://jira.codehaus.org/browse/JETTY-937 , but affecting MINA in the very similar way.
> NioProcessor threads start to eat 100% resources per CPU. After 10-30 minutes of running depending on the load (sometimes after several hours) one of the NioProcessor starts to consume all the available CPU resources probably spinning in the epoll select loop. Later, more threads can be affected by the same issue, thus 100% loading all the available CPU cores.
> Sample trace:
> NioProcessor-10 [RUNNABLE] CPU time: 5:15
> sun.nio.ch.EPollArrayWrapper.epollWait(long, int, long, int)
> sun.nio.ch.EPollArrayWrapper.poll(long)
> sun.nio.ch.EPollSelectorImpl.doSelect(long)
> sun.nio.ch.SelectorImpl.lockAndDoSelect(long)
> sun.nio.ch.SelectorImpl.select(long)
> org.apache.mina.transport.socket.nio.NioProcessor.select(long)
> org.apache.mina.core.polling.AbstractPollingIoProcessor$Processor.run()
> org.apache.mina.util.NamePreservingRunnable.run()
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor$Worker)
> java.util.concurrent.ThreadPoolExecutor$Worker.run()
> java.lang.Thread.run()
> It seems to affect any NIO based Java server applications running in the specified environment.
> Some projects provide workarounds for similar JDK bugs, probably MINA can also think about a workaround.
> As far as I know, there are at least 3 users who experience this issue with Jetty and all of them are running CentOS (some distribution default setting is a trigger?). As for MINA, I'm not aware of similar reports yet.

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