[LOG4NET-533] Log4Net version 1.2.15.0 uses much more CPU than 1.2.11.0

• Type: Bug
• Status: Closed
• Priority: Blocker
• Resolution: Duplicate
• Affects Version/s: 1.2.15
• Fix Version/s: 1.2/2.0 Maintenance Release
• Component/s: Core
• Flags: Patch, Important
• Assignee: Dominik Psenner
• Reporter: Ronald Putz
• Created: 22/Nov/16 08:35
• Updated: 23/Nov/16 14:27
• Resolved: 23/Nov/16 14:24

Description

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.

Issue Links

• duplicates: LOG4NET-429 Pattern with Context property causes severe slowdown