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From "Omry Yadan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (DIRMINA-762) WARN org.apache.mina.core.service.IoProcessor - Create a new selector. Selected is 0, delta = 0
Date Wed, 03 Feb 2010 14:21:28 GMT

     [ https://issues.apache.org/jira/browse/DIRMINA-762?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Omry Yadan updated DIRMINA-762:
-------------------------------

    Attachment: NettyTestServer.java

Looks like Netty 3.1.5.GA (latest stable release) does not suffer from the same problems.
the attached Netty test server does exactly the same as the Mina test server in this ticket,
but does not suffer from throughput drop.

The Netty server also performs great when I use 64 persistent long connections without ANY
delay and 0  short (open and close) connections:
Against the netty client, I get  something between 200k to 300k messages/sec on my box  while
Mina performs poorly at with the same client and get only 20 messages/sec.


> 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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