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https://issues.apache.org/jira/browse/LOG4J2-2644?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ralph Goers resolved LOG4J2-2644.
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Resolution: Fixed
Fix Version/s: 2.12.1
Fixes have been merged. Please verify and close.
> Logging with location information is considerably slower than logging with
> location information in java.util.logging
> --------------------------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-2644
> URL: https://issues.apache.org/jira/browse/LOG4J2-2644
> Project: Log4j 2
> Issue Type: Improvement
> Affects Versions: 2.11.2
> Reporter: Marco Herrn
> Priority: Minor
> Fix For: 2.12.1
>
> Time Spent: 3h
> Remaining Estimate: 0h
>
> according to https://logging.apache.org/log4j/2.x/performance.html logging
> with location information should be roughly the same performance for JUL
> and Log4j2.
> However I made a few comparisons between Log4j2 and JUL and in this case
> Log4j2 is much faster than JUL when omitting location information, but is
> considerably slower when logging with location information.
> Those are the results:
> JUL without location information : 32.162s
> JUL with location information : 21.682s
> Log4j2 without location information: 4.168s
> Log4j2 with location information : 59.000s
> In each case I logged 1500000 simple log statements (only a fixed string)
> and compared the timestamp of the first and the last generated log
> statement. Above you see the time spent between the first and the last log
> statement.
> I did these tests several times and the results are equal each time.
> In all cases I logged to a RollingFileAppender (or JULs equivalent).
> I assume that JUL with location information is faster than JUL without
> location information is because for JUL with location information I used a
> custom Formatter that doesn't support any configuration whereas I was
> using a SimpleFormatter with a specified formatstring for JUL without log
> information.
> It should be noted that I didn't use the Log4j2 API, but instead used the
> JUL logging API and used the log4j-jul-bridge to actually use Log4j2
> instead of the JUL implementation!
> I want to pay special attention to the difference when logging with
> location information, since I am puzzled that Log4j2 is that much slower
> than JUL in that case.
> The example code used for testing and the corresponding logging
> configurations can be found at [my example github
> project|http://github.com/hupfdule/LoggingPerformanceTest].
> I don't think there is anything special. Since when logging without
> location information Log4j2 is much faster than JUL there must be a
> difference between getting the location information. My above mentioned
> custom formatter uses the methods java.util.LogRecord#getSourceClassName()
> and java.util.LogRecord#getSourceMethodName() for obtaining that
> information. I haven't looked into how Log4j2 does it, but it seems to be
> much less efficient.
> I have done the tests with Java 8, but it seems that running it under Java 11
> shows the same behaviour.
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