Shameless self promotion - I just wrote up a little doc [1] on using Locust and Kubernetes to run and scale distributed load tests along with some sample code [2].

I looked at JMeter and Gatling as alternatives but they were either a bit clunky (JMeter) or not distributed out of the box (Gatling). Late in the game I did discover Tsung (Erlang) but didn't get time to try it out - looks pretty powerful though.

[1] https://cloud.google.com/solutions/distributed-load-testing-...

[2] https://github.com/GoogleCloudPlatform/distributed-load-test...