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https://issues.apache.org/jira/browse/LOG4NET-454?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Chuck Felish updated LOG4NET-454:
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Summary: Intermittent severe slowdown with RollingFileAppender+MinimalLock
(was: Intermittent severe slowdown)
> Intermittent severe slowdown with RollingFileAppender+MinimalLock
> -----------------------------------------------------------------
>
> Key: LOG4NET-454
> URL: https://issues.apache.org/jira/browse/LOG4NET-454
> Project: Log4net
> Issue Type: Bug
> Components: Appenders
> Affects Versions: 1.2.13
> Environment: ASP.NET MVC 5.2.2 Application, Windows 7 Professional
> Reporter: Chuck Felish
>
> Using RollingFileAppender with MinimalLock we found an extreme slowdown in
> the processing of our application requests (from 300ms to up to 15s in some
> cases) which was resolved when we deleted our log files. We also found that
> changing the lock to Exclusive resolved the issue.
> Interestingly file content seemed to be related, but not file size. When I
> took the contents of a colleague's log file and pasted them into my own log
> file the slowness issue appeared again. I then tried deleting about half the
> contents and then causing the file to grow to larger than the original size
> but the issue did not return. Pasting the original contents back into the
> file caused the performance issue to return.
> While Exclusive lock has resolved our issue for now, it's quite unexpected
> that file contents would affect performance at all, and that the issue is
> does not consistently reproduce even though configuration is unchanged.
> I'm happy to demonstrate and/or share our problematic log files with you to
> facilitate the resolution of this issue.
> Our configuration is as follows:
> <appender name="RollingFile" type="log4net.Appender.RollingFileAppender">
> <file type="log4net.Util.PatternString"
> value="Logs\%property{ExecutableName}_%env{COMPUTERNAME}.log" />
> <lockingModel type="log4net.Appender.FileAppender+MinimalLock" />
> <appendToFile value="true" />
> <rollingStyle value="Size" />
> <maximumFileSize value="5MB" />
> <maxSizeRollBackups value="50" />
> <preserveLogFileNameExtension value="true" />
> <layout type="log4net.Layout.PatternLayout">
> <conversionPattern value="%d{yyyy-MM-dd HH:mm:ss.fff}
> [%-5level][%5thread] %logger - %m%n" />
> </layout>
> </appender>
> <root>
> <!-- NOTE: This is overriden programatically by Log4NetConfig.cs -->
> <level value="ALL" />
> <!-- <appender-ref ref="ColorConsole" />-->
> <appender-ref ref="RollingFile" />
> </root>
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