I've used Tsung a few times. But I have to think very hard when I configure or run it.

Gatling appears to solve the same problem but aims to be simpler.

Can anyone who has used both weigh in on how well it achieves this goal?

I had no problem when using Tsung with my ejabberd server, but I haven't used with anything else, so I can't really tell.

I immediately thought of Erlang when reading the description of Gatling. Thanks for the link; I wondered if such a thing existed.

The actor model tipped you off? :)