http load testing tool

Question

I want to record web activity as would be done by a single user and then run one or multiple such simulteanous users (perhaps tweaking some params, such as converting user/password into user1/password, ..., usern/password). Playing with timing would be nice too.

Answer 1

Grinder is one of the best I have used, the tool is built in java but I used this to test my ASP.NET application. Tested using 3 machines. (each machine would only simulate a max of 1000 users at one time). We ended up doing the load test for 3000 concurrent users.