Best performance test tool

[Ortal]

Hello,

I created a NGINX module, I am trying to do a benchmark on my module. I
would like to check the performance on a post requests (different files...).
I tried to use ab, wrk and locust. I tried running each one of the tools on
the same NGINX servers and different servers. In all of my tests the NGINX
did not passed the 30% CPU while the tolls got to over 100%. 

My question is: 
Which tool I can use to test NGINX with post requests in the best way?

Thanks,
Ortal

Posted at Nginx Forum: https://forum.nginx.org/read.php?2,264161,264161#msg-264161