If you are using WCAT to stress test your IIS application you can use the logfiles of IIS to create the UBR file that WCAT uses with the help of Logparser:
logparser file:.SamplesTemplateFileswcat.sql -tpl:.SamplesTemplateFileswcat.tpl
This creates a stresstest.ubr
You can tweak the SQL file…
Start WCAT Controller with:
wcctl.exe -z stresstest.ubr -n Server -a Server
And the WCAT Client with:
clientloop.cmd Controller
Source
http://www.iis.net/default.aspx?tabid=2&subtabid=26&i=5
http://www.iis.net/downloads/default.aspx?tabid=34&g=6&i=1466