Stephen Connolly created LOGBACK-1279:
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Summary: Async appenders do not scale well across multiple threads
Key: LOGBACK-1279
URL: https://jira.qos.ch/browse/LOGBACK-1279
Project: logback
Issue Type: Bug
Components: logback-classic
Affects Versions: 1.2.1
Reporter: Stephen Connolly
Assignee: Logback dev list
Attachments: image-2017-03-13-12-10-55-553.png
When running some benchmarking (specifically
[https://github.com/stephenc/java-logging-benchmarks/blob/master/log4j-fmt/logback-async/src/main/java/me/justpitch/loggingbenchmarks/LoggingBenchmark.java]
- at time of issue creation @ceki has access to repo, but repo is due to
become public soon) I noticed that the Async appender does not scale well when
the number of threads increases.
In fact the Async appender - which to my understanding is designed to help
provide a more consistent latency under multiple threads - has dire performance
when the number of threads increase, e.g. !image-2017-03-13-12-10-55-553.png!
The above results show that Log4J with an async appender has a profile very
similar to that of both Logback and Log4J with a non-asynchronous appender.
Logback's asynchronous appender performance gets progressively worse and
approximates the performance of Java Utils Logging above 16 threads on the test
system
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