Load Testing a Rails Application - What tool is most used?

Hi all,

I’m keen to develop a way to load test my rails application, as a way to
check if there are any bottlenecks (bugs, bad design) and that it will
scale
ok.

Q1: What’s the most used load testing tool by Rails developers? I
know
there are several web application load test tools out there, but are
there
any (open source/cheap) that are particularly suited to Rails for any
reason?

Q2: Ideally the tool would pull server O/S stats to present along with
HTTP
response stats (e.g. server CPU, memory etc). I’m currently stuck
developing on Windows but host on Dreamhost (unix). Which tool would be
recommended to access/present such detail as well?

Tks
Greg