Jmeter is a server performance testing tool freely available for download at:
http://jakarta.apache.org/jmeter/
This tool enables web servers to be tested independent of Siteminder allowing load tests to be run and performance metrics to be obtained.
Preparing Siteminder
Jmeter will not work correctly if a basic authentication scheme is used on your Siteminder protected site. Likewise if a two factor authentication scheme is used Jmeter will not be able to authenticate correctly.