Ti giro quanto da linux journal: Siege is an open source regression test and benchmark utility. It can stress test a single URL with a user defined number of simulated users, or it can read many URLs into memory and stress them simultaneously. The program reports the total number of hits recorded, bytes transferred, response time, concurrency, and return status. Most features are configurable with command line options, which also include default values to minimize the complexity of the programs's invocation.

installazione banale:

aptitude install siege
man siege