Hi, I have a problem. I need simulate load in my web server, but all the tools that I see are not free (sorry but my English it's very poor). Can anyone recommend me any free tools that simulate load in a web server?
apache bench or ab can be used to repetetively make requests from a server for a period of time and report statistics.
http://httpd.apache.org/docs/2.0/programs/ab.html
Never used it, but httperf is also often mentioned in articles about this sort of thing:
http://www.hpl.hp.com/research/linux/httperf/
Wikipedia also has an article on the topic (its more of a list)
Grinder is used for load testing. It is quite handy if you have a good acceptance test suite to use as a test material.
You can always look into monitis' new load testing service. http://www.webloadtester.com/
You can choose the number of nodes, level of requests, etc. and the fee is pretty nominal at this sage. I think it is around $2 until the 15th (of Feb 09), pricing after that TBA.
As a note, monitis is behind mon.itor.us, which has a decent track record.