httperf: A relatively well-known open source utility developed by HP, for Linux operating systems only
website: http://www.hpl.hp.com/research/linux/httperf
the source comes as a tar.gz archive and needs to be compiled using the standard method
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in this example httperf will download http://192.168.1.100/index.html repeatedly, 300 times per seconds, resulting in a total of 30,000 requests.
--rate how many request should be sent every second
--num-conn the total amount of connections
--num-call how many requests should be sent per connection
--timeout quantity of seconds elapsed before a request is considered lost
If the success ratio is 100 percent or the response time near 0 ms, increase the request rate and run the rest again until the server shows signs of weakness,
once the results begin to look a little less perfect tweak the appropriate configuration directives and run the test again