JMeter - a brilliant free and open source load testing application

Apache JMeter is indeed a great tool to test performance both on static and dynamic resources (files, Servlets, Perl scripts, Java Objects, Data Bases and Queries, FTP Servers and more). This is very handy in doing say concurrent user testing, benchmarking performance with CPU and Memory usage stats. Very useful while deploying your app on Amazon EC2 or similar cloud infrastructure.





Here is a brief but good tutorial on YouTube.