Remko Popma created LOG4J2-1297:
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Summary: Document "gc-free" configuration and performance
Key: LOG4J2-1297
URL: https://issues.apache.org/jira/browse/LOG4J2-1297
Project: Log4j 2
Issue Type: New Feature
Components: Documentation
Affects Versions: 2.5
Reporter: Remko Popma
Assignee: Remko Popma
Update the site with a description of which configurations are GC-free (i.e.,
that don't create temporary objects in steady running state).
Currently that means
* Loggers are all asynchronous (Log4jContextSelector is set to
org.apache.logging.log4j.core.async.AsyncLoggerContextSelector)
* the configuration does not contain a <Properties> section
* the configuration only contains a RandomAccessFileAppender or a
RollingRandomAccessFileAppender (any other appender will cause temporary
objects to be created - including ConsoleAppender)
* the Layout is a PatternLayout that uses one of the pre-defined date formats,
does not have any regular expression replacements, and does not have lookups
(TODO: may need to restrict this further)
Furthermore, we need to explain that some of this functionality depends on
ThreadLocals and so is disabled by default in web applications to prevent
memory leaks. The page should also explain how to manually switch off the use
of ThreadLocals.
Finally, the page should show a performance test comparison similar to the
[performance
section|http://logging.apache.org/log4j/2.x/manual/async.html#Performance] on
the Async Loggers page. I'm thinking a comparison between Logback, Log4j-1,
Log4j-2.0, Log4j-2.6 "classic" and Log4j-2.6 "gc-free" would be ideal.
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