httperf

Get latest version from ftp://ftp.hpl.hp.com/pub/httperf/

Usage

httperf --server staging.myserver.com 
--uri /test/report_generation --num-conns 1000 --rate 10

(1000 connections at a rate of 10 per second) There’s an excellent Peepcode screencast on the subject: http://peepcode.com/products/benchmarking-with-httperf