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https://issues.apache.org/jira/browse/LOG4NET-533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15690236#comment-15690236
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Dominik Psenner commented on LOG4NET-533:
-----------------------------------------
I just noticed that there is a patch attached to LOG4NET-429. You could try
that patch and see if it improves the performance for your usecase.
> Log4Net version 1.2.15.0 uses much more CPU than 1.2.11.0
> ---------------------------------------------------------
>
> Key: LOG4NET-533
> URL: https://issues.apache.org/jira/browse/LOG4NET-533
> Project: Log4net
> Issue Type: Bug
> Components: Core
> Affects Versions: 1.2.15
> Reporter: Ronald Putz
> Assignee: Dominik Psenner
> Priority: Blocker
> Fix For: 1.2 Maintenance Release
>
> Attachments: Release_1_2_15.zip
>
>
> We switched to the version 1.2.15 in our production system and figured out a
> general increase. After a long analysis we have figured out that log4net uses
> more cpu compared to the version 1.2.11.0
> config:
> <configSections>
> <section name="log4net"
> type="log4net.Config.Log4NetConfigurationSectionHandler, log4net" />
> </configSections>
> <log4net debug="true">
> <appender name="ConsoleAppender" type="log4net.Appender.ConsoleAppender">
> <layout type="log4net.Layout.PatternLayout">
> <param name="ConversionPattern" value="%utcdate{yyyy-MM-dd
> HH:mm:ss.fff} [%6thread] [%36property{context}] %-5level
> %-35.35logger %-25method %message%newline" />
> </layout>
> </appender>
> <appender name="RollingFileAppender"
> type="log4net.Appender.RollingFileAppender">
> <file value="c:\mylogfile.txt"/>
> <appendToFile value="true"/>
> <rollingStyle value="Size"/>
> <maxSizeRollBackups value="5"/>
> <maximumFileSize value="10MB"/>
> <staticLogFileName value="true"/>
> <!--filter type="log4net.Filter.StringMatchFilter">
> <stringToMatch value="test"/>
> </filter>
> <filter type="log4net.Filter.StringMatchFilter">
> <stringToMatch value="error"/>
> </filter>
> <filter type="log4net.Filter.DenyAllFilter"/!-->
> <!--filter type="log4net.Filter.LevelRangeFilter">
> <levelMin value="INFO"/>
> <levelMax value="FATAL"/>
> </filter!-->
> <layout type="log4net.Layout.PatternLayout">
> <param name="ConversionPattern" value="%utcdate{yyyy-MM-dd
> HH:mm:ss.fff} [%6thread] [%36property{context}] %-5level
> %-35.35logger %-25method %message%newline" />
> <!--conversionPattern value="%date PID-%property{pid} TID-%thread
> %level - %message%newline%exception %location %logger"/!-->
> </layout>
> </appender>
>
> <root>
> <level value="DEBUG"/>
> <appender-ref ref="RollingFileAppender"/>
> <appender-ref ref="ConsoleAppender"/>
> </root>
> </log4net>
> C# code:
> static void Main(string[] args)
> {
> log4net.Config.XmlConfigurator.Configure();
> for (int i = 0; i < 10; i++)
> {
> Thread worker = new Thread(() =>
> {
> while (true)
> {
> Log.Debug(" This is the
> debug message!");
> Log.Error(" This is the
> error message!");
> Log.Info(" This is the
> info message!");
> Log.Fatal(" This is the
> fatal message!");
> Log.Warn(" This is the
> warning message!");
> Thread.Sleep(1000);
> }
> });
> worker.IsBackground = true;
> worker.Start();
> }
> for (int i = 0; i < 60; i++)
> {
> Thread.Sleep(1000);
> }
> return;
> We had to return to the old version of the log4net dll.
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