I’d recommend that you have a look at wrk2 (GitHub - giltene/wrk2: A constant throughput, correct latency recording variant of wrk · GitHub) as well. It is especially written to consider something called coordinated omission (explained in the readme for wrk2 and there are some good talks on it as well if you search for it).
It also allows you to set the rate (perhaps wrk can do this today as well) of requests so that you don’t overload your system (unless that is what you are testing).
For more elaborate testing you have
- tsung (http://tsung.erlang-projects.org/). It feels a bit “old” but it pretty good. I think this is what was used when they tested the 2M web socket connections.
- gatling (https://gatling.io/) I found quite pleasant to work with.
