In the end, we found that the maximum connections concept was too imprecise to provide the complete answer to the puzzle. In this article, we’ll describe other approaches such as load shedding that we found worked well.

Top 2 performers are bjoern (written in C) > meinheld (based on picoev)

JoeDog Open Source Software

boom - A replacement for AB (Apache Bench)

A good way to see how your Web applications and server will behave under high load is by testing them with a simulated load. We tested several free software tools that do such testing to see which work best for what kinds of sites.

wrk - Modern HTTP benchmarking tool