I am surprised nobody mentioned tank (<a href="https:&#x2F;&#x2F;github.com&#x2F;yandex&#x2F;yandex-tank" rel="nofollow">https:&#x2F;&#x2F;github.com&#x2F;yandex&#x2F;yandex-tank</a>) yet. I found it highly configurable, relatively easy to use. For those who is interested in good perfomance and features, it might be a good choice.