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From Remko Popma <remko.po...@gmail.com>
Subject Re: why is AsyncLoggerContextSelector faster?
Date Fri, 18 Jul 2014 16:20:28 GMT
The Async Loggers created with the context selector have a slightly
different mechanism. One of the differences is that LogEvent objects are
re-used.

However, unless your application is in the low-latency space, I would not
worry too much about the performance difference. Both flavors of Async
Loggers are much faster than the alternative (Async Appenders).

Your point is valid though. I've been thinking about an alternative way to
configure Async Loggers than via system properties. The work in progress is
tracked in Jira ticket LOG4J2-321
<https://issues.apache.org/jira/browse/LOG4J2-321>. This is still in the
concept phase though. Meanwhile your best option is probably to use
ClassLoaderContextSelector and configure with <AsyncRoot> and <AsyncLogger>.



On Fri, Jul 18, 2014 at 10:57 PM, Mariano Gonzalez <
mariano.l.gonzalez@gmail.com> wrote:

> Hello,
>
> According to the performance charts in the documentation, log4j2 has a
> significantly higher throughput when using AsyncLoggerContextSelector than
> when using all async loggers with any different selector.
>
> Why is that? Is it just because the same context is always reused and
> there's no lookup like in the ClassLoaderContextSelector case?
>
> If I need functionality similar to ClassLoaderContextSelector, is there any
> way to get a throughput similar to AsyncLoggerContextSelector?
>
> Thanks!
>

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