Comment by mrb

What do you mean by "inherently multithreaded"? I have written a network application handling 100-500k TCP concurrent connections using libev. It was multithreaded to distribute the number of connections evenly per thread (typically from 10k to 100k connections per thread). This is a model that is perfectly supported by libev. And I observed a nice linear scaling of the network throughput with the number of cores since my jobs were also purely CPU-bound. Depending on how CPU intensive my jobs were exactly, my libev code needed anywhere from 2 to 10 threads to saturate a GbE link.