WhatsApp did modify Erlang but it's interesting that Elixir/Phoenix was able to hit the same scale on a single server without any such optimizations. [1] [1] h

WhatsApp did modify Erlang but it's interesting that Elixir/Phoenix was able to hit the same scale on a single server without any such optimizations. [1] [1] https://changelog.com/podcast/208 https://changelog.com/podcast/208 > I wasn’t thinking we could actually get WhatsApp-like scale, because when I read about WhatsApp, they were using FreeBSD and they forked Erlang and made some optimizations, they fine-tuned FreeBSD… So I was thinking that it was gonna be very difficult to try to replicate that kind of scale. > So we were doing extra work, and it was really fulfilling to actually see that with minor changes in our initial best-effort approach with just a few tweaks was able to go to something that was able to get millions of connections. That was incredibly fulfilling to come full circle, and also it’s a great brag slide now, of showing that two million connections chart.