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https://issues.apache.org/jira/browse/LOG4NET-533?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15690230#comment-15690230
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Dominik Psenner commented on LOG4NET-533:
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Thanks, I have run your sample applications with my performance profiler. At
first glance log4net 1.2.15 consumes more cpu cycles when rendering log events,
yielding a speedup of 0.45. That means that 1.2.11 was able to render about 2.2
times as many log events as 1.2.15 is able to in the same amount of time.
Looking at the call tree there is a significant change to be observed. With
1.2.11 the MethodLocationPatternConverter used to consume the most cpu cycles
whereas 1.2.15 shows the PropertyPatternConverter as top cpu consumer. The
PropertyPatternConsumer itself spends most of the time with
LoggingEvent.CreateCompositeProperties() which in turn looks up the UserName by
calling WindowsIdentity.get_Name(). With this information I was able to bisect
it to svn revision 1511303 which is linked to LOG4NET-205, which again is
linked as a breaker for LOG4NET-429.
This all boils down to the fact that this issue is a duplicate of LOG4NET-429.
As a workaround, you could remove property{context} from the patternlayout.
> 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
> 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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