c10k

https://habr.com/ru/articles/145796/

https://en.wikipedia.org/wiki/C10k_problem

https://ru.wikipedia.org/wiki/C10k

https://stackoverflow.com/questions/17593699/tcp-ip-solving-the-c10k-with-the-thread-per-client-approach

http://www.kegel.com/c10k.html#aio%22C10K%20article%22

http://highscalability.com/blog/2013/5/13/the-secret-to-10-million-concurrent-connections-the-kernel-i.html

http://readystate4.com/2012/07/08/nginx-the-non-blocking-model-and-why-apache-sucks/

http://www.slashroot.in/how-is-nginx-different-from-apache