Turning On Pipeline Logging
When pipeline logging is enabled, pipeline log files are stored in the pipeline\log folder as described in How to Secure Your Pipeline Log Files Folder.
Note
You should use pipeline logging only in development mode. Although you can enable pipeline logging while in production mode, doing so tends to decrease the performance of your site to unacceptable levels as the log files continue to grow. In a production environment, make sure that the loggingEnabled attribute of the pipeline elements within the pipelines element of the Web.config file for your application is set to the default value of "false".
You can enable pipeline logging in the following:
ASP.NET sites
COM pipeline objects
.NET OrderPipeline and ContentSelectionPipeline classes
Note
For ASP.NET sites, a log file is created for every user and pipeline pair, so that every user has a log file for every pipeline the user runs. If a user runs a pipeline more than once, any previous log file for that user for that pipeline is overwritten by the new log file.