Log4Net and logging from parallel instances

logging log4net parallel-processing fileappender
Akim Khalilov picture Akim Khalilov · Nov 28, 2009 · Viewed 9.1k times · Source

I'm using log4net in my project and there is one problem. The major function of the program takes a long time and I use logging to save information about it. I use FileAppender for saving log to file.

My application is on the shared(local) folder and there could be several instances of the application running from one path. In this case I could log information only from the first program, other instances of my applications couldn't log info because log file is locked.

When I'm using "log4net.Appender.FileAppender+MinimalLock" option there are cases of information loss. Not all logs from both instances are saved to file.

How can I solve this problem and log info from parallel instances? Also what about performance degradation when I use "MinimalLock" option?

Thanks. Hope for your help.

Answer

nakhli picture nakhli · Oct 11, 2010

Simply include the process id of the application in the log file name. Different instances of your app will then log to different files. Here is an example:

<appender name="MyRollingFileAppender" type="log4net.Appender.RollingFileAppender">
  <file type="log4net.Util.PatternString">
    <conversionPattern value="log_%processid.log" />
  </file>
<!-- ... -->

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