oddurmagg

What other services like this are out there ?

I know of loader.io but I am specifically looking for ones which I can script to simulate real users.

Stackless Python support Go style concurrency with tasklets( goroutines in go) and channels for scheduling and data passing between them.

Pypy now has stackless support, which makes it the obvious candidate for doing CSP style concurrency with python.

It will not however, scale that concurrency to execute in parallel in multiple cores, since it is still bound by the GIL.

If you want to stay with CPython, you could look at Gevent.