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From "Jonathan Valliere (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (DIRMINA-1068) Mina 2.0.7 cpu load 100% on windows server 64
Date Mon, 05 Mar 2018 17:29:00 GMT

    [ https://issues.apache.org/jira/browse/DIRMINA-1068?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16386397#comment-16386397
] 

Jonathan Valliere commented on DIRMINA-1068:
--------------------------------------------

Windows limits the number of sockets per selector to a small number; I want to say 128 but
its been a very long time.  Basically the JDK NIO creates lots of threads which run concurrent
{{select}} operations on behalf of the one called from NIO.  This allows the JDK NIO to have
larger sockets per selector count than Windows would typically allow.  All these threads spin
up and block on each other until one or all of them resolve.  Remember when we discussed the
ulimit error in {{accept}} ?  Well, in Windows they have to keep creating and destroying {{Selectors}}
internally, its possible that the internal Windows NIO is hitting a ulimit style exception
and is unable to create these dozens of selector threads.  The whole issue is probably related
reaching [https://blogs.technet.microsoft.com/markrussinovich/2009/09/29/pushing-the-limits-of-windows-handles/|max
open file limit].

> Mina 2.0.7 cpu load 100% on windows server 64
> ---------------------------------------------
>
>                 Key: DIRMINA-1068
>                 URL: https://issues.apache.org/jira/browse/DIRMINA-1068
>             Project: MINA
>          Issue Type: Bug
>          Components: Core
>    Affects Versions: 2.0.7
>         Environment: windows server 64
> JDK 1.8.0_121 
>            Reporter: gunker
>            Priority: Major
>         Attachments: $V350`0YL5A@`FQ)5GFJ97S.jpg, )XDXFZF(26)(25UK0OVL)WW.jpg, ABN)]7BCUMHZLESQVUO%4@P.jpg,
F5}3O~0_4K1KH(XJDXG`_RR.jpg, O`AUL[7]JG5QVKFY4K~`[$M.jpg, _HB%JVLZW`NW]~JW4L0766J.png
>
>
> in my case:
> I deploy this service on windows server(64).
> At beginning, all is normal. But after servrial days (not a fixed time) the cpu load
100%, I dump the theads info, it shows has a lot of "Thread-" threads, and the mina NioSocketAcceptor
thread load 100%.     



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