Probably a combination of Netty having a small default thread pool size (2*cores) and the benchmark doing something blocking or compute intensive. Tomcat defau

Probably a combination of Netty having a small default thread pool size (2*cores) and the benchmark doing something blocking or compute intensive. Tomcat defaults to 200 threads, which would explain the difference. Edit: Though the page says "The controller does nothing except return a simple 200".