I'm not positive about this but try JMeter on apache.org web site. I
think that may help you.
"Wang, Jianming" wrote:
>
> Hi, everybody.
>
> We have a Web application beta version. We want to find tools to test how
> many users can concurrently use this application, when the application
> performance slow down while users' amount increasing, etc.. In a word, we
> need a tool to do loading test. Certainly, at current stage, we don't want
> to spend money on testing tools. Does anybody know where we can find such
> tools for free?
> Thanks in advance.
>
> Jianming Wang
