HP LoadRunner is a software testing tool from Hewlett-Packard. The software allows you to prevent application performance problems by detecting bottlenecks before a new system or upgrade is deployed. LoadRunner can simulate thousands of users concurrently using application software, recording and later analysing the performance of key components of the application. It gives you a picture of end-to-end system performance before going live so that you can verify that new or upgraded applications meet performance requirements. And it reduces hardware and software costs by accurately predicting application scalability and capacity.