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https://issues.apache.org/jira/browse/LOG4J2-1892?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Daniel R updated LOG4J2-1892:
-----------------------------
Description:
With {{spinPolicy="WAITING"}} CPU usage shoots up to 11% and stays right there
with no app activity.
With {{spinPolicy="BLOCKING"}} CPU usage goes down to near 0% with no app usage.
In my local dev environment the Async appender is configured but not used
(commented out in the <Root> section.
Config excerpt:
{code:xml}
<Appenders>
...
<!-- Wrap the email error appender into an asynchronous appender -->
<Async name="ASYNC_EMAIL_ERROR" bufferSize="128" >
<DisruptorBlockingQueue spinPolicy="WAITING"/>
<AppenderRef ref="EMAIL_ERROR" />
</Async>
</Appenders>
<Root level="INFO">
<AppenderRef ref="CONSOLE"/>
<!--AppenderRef ref="FILE"/-->
<!--AppenderRef ref="FILE_ERROR"/-->
<!--AppenderRef ref="ASYNC_EMAIL_ERROR"/-->
</Root>
{code}
was:
With {{spinPolicy="WAITING"}} CPU usage shoots up to 11% and stays right there
with no app activity.
With {{spinPolicy="BLOCKING"}} CPU usage goes down to near 0% with no app usage.
In my local dev environment the Async appender is configured but not used
(commented out in the <Root> section.
Config excerpt:
{code:xml}
<Appenders>
...
<!-- Wrap the email error appender into an asynchronous appender -->
<Async name="ASYNC_EMAIL_ERROR" bufferSize="128" >
<DisruptorBlockingQueue spinPolicy="WAITING"/>
<AppenderRef ref="EMAIL_ERROR" />
</Async>
</Appenders>
<Root level="INFO">
<AppenderRef ref="CONSOLE"/>
<!--
<AppenderRef ref="FILE"/>
<AppenderRef ref="FILE_ERROR"/>
<AppenderRef ref="ASYNC_EMAIL_ERROR"/>
-->
</Root>
{code}
> High constant CPU usage with Async appender DisruptorBlockingQueue spinPolicy
> 'WAITING'
> ---------------------------------------------------------------------------------------
>
> Key: LOG4J2-1892
> URL: https://issues.apache.org/jira/browse/LOG4J2-1892
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.8.2
> Environment: JDK 7, Jetty 9.2 but also observed in JDK 8/Tomcat 8
> Reporter: Daniel R
> Labels: performance
>
> With {{spinPolicy="WAITING"}} CPU usage shoots up to 11% and stays right
> there with no app activity.
> With {{spinPolicy="BLOCKING"}} CPU usage goes down to near 0% with no app
> usage.
> In my local dev environment the Async appender is configured but not used
> (commented out in the <Root> section.
> Config excerpt:
> {code:xml}
> <Appenders>
> ...
> <!-- Wrap the email error appender into an asynchronous appender -->
> <Async name="ASYNC_EMAIL_ERROR" bufferSize="128" >
> <DisruptorBlockingQueue spinPolicy="WAITING"/>
> <AppenderRef ref="EMAIL_ERROR" />
> </Async>
> </Appenders>
> <Root level="INFO">
> <AppenderRef ref="CONSOLE"/>
> <!--AppenderRef ref="FILE"/-->
> <!--AppenderRef ref="FILE_ERROR"/-->
> <!--AppenderRef ref="ASYNC_EMAIL_ERROR"/-->
> </Root>
> {code}
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