Follow this procedure to enable performance logging in PM Compass.
To enable performance logging:
Locate the web.config file, which is located in the Web folder of the PM Compass installation location, and open it using Notepad or any other text editor.
In the <appSettings> section, add or locate the following lines:
<add key="PerfLogFilePath" value="C:\metric\pmc_perf_server.log" />
Save and close the web.config file.