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From "Remko Popma (JIRA)" <j...@apache.org>
Subject [jira] [Closed] (LOG4J2-574) Make Blocking the default WaitStrategy for Async Loggers
Date Sun, 23 Mar 2014 09:07:42 GMT

     [ https://issues.apache.org/jira/browse/LOG4J2-574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Remko Popma closed LOG4J2-574.
------------------------------


> Make Blocking the default WaitStrategy for Async Loggers
> --------------------------------------------------------
>
>                 Key: LOG4J2-574
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-574
>             Project: Log4j 2
>          Issue Type: Improvement
>          Components: Appenders
>    Affects Versions: 2.0-rc1
>            Reporter: Remko Popma
>            Assignee: Remko Popma
>             Fix For: 2.0-rc2
>
>
> With Asynchronous Loggers, the wait strategy determines what the consumer thread does
when the queue is empty and it is waiting for events. The LMAX Disruptor offers several options,
as some specialized apps want to avoid the latency of waking up a blocked thread. These options
have different trade-offs, with busy spin on one end of the spectrum and blocking on the other.

> In log4j we only expose a limited set of these options (no busy spin), and originally
chose SleepingWait as the default as it seemed to have the best performance in testing.
> It turned out that in some environments the current default of SleepingWaitStrategy may
result in excessive CPU usage (LOG4J2-571). To avoid such problems this ticket proposes to
change the default wait strategy for Async Loggers to BlockingWaitStrategy.



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