ApacheBench is a tool to do lightweight performance benchmarking on web applications. It is part of Apache which ships by default with Mac OS X. However, Mac OS X Lion comes with a version that has some issues. Here is an example of benchmark running against a local Ruby on Rails application: $ ab -n 100 -c5 http://127.0.0.1:3000/ This is ApacheBench, Version 2.3 <$Revision: 655654 $> Copyright 19