FWIW I'm not sure if it's good practice or not. I used locust.io recently. The client allowed me to ramp up request rates until I got HTTP Errors. I measured a

FWIW I'm not sure if it's good practice or not. I used locust.io recently. The client allowed me to ramp up request rates until I got HTTP Errors. I measured against their previous analytic sites. Of course this was a guesstimate because GA doesn't let you see the max num of simultaneous users. I found holes in the infrastructure that need to be remedied. The holes were to prevent anything similar to a slashdot effect. I also watched against the servers IO/CPU utlization, and RAM.