This tool is not can be used to simulate the situation of high concurrency? If I have a personal website, didn't do any concurrent processing, by means of which I send my website more than 5000 request, will lead to my site collapse, and if my website to do the reverse proxy

The port number here is how much, and I don't know, I can not fill in? Finally, if I always send the request to the site, how do I know hair didn't sent out?
Just don't know contact