A stress test for several days and fully networked stacks can give you an idea. And in my experience C/libevent would be hard to beat there by anything as ther

A stress test for several days and fully networked stacks can give you an idea. And in my experience C/libevent would be hard to beat there by anything as there are less things that can block service. A classic is seeing the garbage collector going bananas for a few seconds in object-oriented languages.