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Posted to log4j-dev@logging.apache.org by "Remko Popma (JIRA)" <ji...@apache.org> on 2016/05/09 16:21:12 UTC
[jira] [Closed] (LOG4J2-1382) Performance regression in
RewriteAppender
[ https://issues.apache.org/jira/browse/LOG4J2-1382?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Remko Popma closed LOG4J2-1382.
-------------------------------
Resolution: Fixed
Fixed in master.
> Performance regression in RewriteAppender
> -----------------------------------------
>
> Key: LOG4J2-1382
> URL: https://issues.apache.org/jira/browse/LOG4J2-1382
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 2.6
> Reporter: Remko Popma
> Assignee: Remko Popma
> Fix For: 2.6
>
>
> While working on LOG4J2-1179, I ran into these benchmark results:
> {code}
> Benchmark Mode Samples Score Error Units
> o.a.l.l.p.j.Log4j2AppenderComparisonBenchmark.appenderRewrite thrpt 5 44263670.008 ± 17389305.070 ops/s
> o.a.l.l.p.j.Log4j2AppenderComparisonBenchmark.end2endRewrite thrpt 5 37254.554 ± 16440.919 ops/s
> {code}
> In plain English: directly calling RewriteAppender.append(LogEvent) can do 44 million ops/sec, but when calling rewriteLogger.debug(msg) to invoke a logger that calls this appender, all of a sudden throughput drops to 37 _thousand_ ops/sec. That's 1000x slower. Fishy...
> Turns out that when rewriting the event we are now including caller location information (taking a snapshot of the stack and walking it). Ouch.
> This is a regression caused by the garbage-free stuff. Rewriting the event makes a copy of the event and avoids calling LogEvent.getSource() only if the event is an instance of Log4jLogEvent, but now we are passing in MutableLogEvent.
> The fix is to update Log4jLogEvent.Builder to also avoid calling getSource when copying from a MutableLogEvent.
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