Video: https://vimeo.com/44312354
Slides (PDF): http://www.erlang-factory.com/upload/presentations/558/efsf2...
That's just to warm up. How about 10+ million connections per box (Java + CentOS + enterprise box)? https://mrotaru.wordpress.com/2015/05/20/how-migratorydata-s...
For a given real use-case communication pattern, there will be different optimizations and approaches to squeeze peformance out of client and server hardware. (No 1SFA, YMMV.)