Latency difference Hey tool vs Locust

[krishnanramkumar]

I am trying to compare the latency difference between Locust and Hey Tool for my Node JS app and I see a Hey tool latency is 10x higher than Locust. It is the same end point and it is the same RPS I am trying to send. I see the latency to be same with 1 user/10 users but when I increase with 500 users and 600 users I see the difference to be pretty high. Not sure what is happening in Hey tool that is making the service overloaded and resulting in very high latency. It is a simple GET request. Also I see a lot of variability in terms of latency with Hey tool.