LoadRunner is an industry-leading performance and load testing product by Hewlett-Packard (since it acquired Mercury Interactive in November 2006) for examining http://www.onestoptesting.com/load-runner/introduction.asp# - - system behavior and performance, while generating actual load.

LoadRunner can emulate hundreds or thousands of concurrent users to put the http://www.onestoptesting.com/load-runner/introduction.asp# - - application through the rigors of real-life user loads, while collecting information from key infrastructure components ( http://www.onestoptesting.com/load-runner/introduction.asp# - - Web - applications :

The Virtual User Generator allows us to determine what actions we would like our Vusers, or virtual users, to perform within the application. We create scripts that generate a series of actions, such as logging on, navigating through the application, and exiting the program.

The Controller takes the scripts that we have made and runs them through a schedule that we set up. We tell the Controller how many Vusers to activate, when to activate them, and how to group the Vusers and keep track of them.

The Results and Analysis program gives us all the results of the load test in various forms. It allows us to see summaries of data, as well as the details of the load test for pinpointing problems or bottlenecks.