Websocket concurrent connections limit on Heroku

Question

How many websocket concurrent connections can a single Heroku dyno hold?

I'm running Thin as the web server on top of the Cedar stack with a Ruby framework.

Answer 1

"You can maintain around 6,000 open connections on a single dyno Creating more than 160 connections/sec will cause H11 errors (backlog too deep)"

Take a look to this link:

http://veldstra.org/2013/10/25/heroku-websocket-performance-test.html