ab is a tool for benchmarking your Apache Hypertext Transfer Protocol (HTTP) server. It is designed to give you an impression of how your current Apache installation performs. This especially shows you how many requests per second your Apache installation
With all the recent hubbub about GlassFish, I decided to do a quick performance test this morning. I downloaded all the most recent versions of the various open source application servers, deployed AppFuse 1.9.3 (Struts version) on them, and ran "ant test