Optimize broadcasting with sending a prepared websocket frame

[vladbat00]

See websockets/ws#617 to get the idea

[adamkaplan]

The code in referenced issue has expanded use now. It works extremely well, super efficient when the use case is pure broadcast. Supporting over 500,000 connections (avg/minute) with high broadcast data rate. We stopped pushing the connection counts up on the WS hosts because the costs got low enough that it didn't matter :-)

[vladbat00]

@adamkaplan, thanks for reaching out!

The code in referenced issue has expanded use now

By "now" do you mean that some changes were made to the code or ws library got improved? Or you just mean that you started using the code even more? :)

Btw, I stopped working on this project for now.. And I'm not sure whether I'll get back to it and apply that code. Though I found the discussion in the issue quite interesting and informative, thanks for your time sharing your approach to the problem.

[adamkaplan]

Just noticed this- I meant that the code is used “even more” now. I haven’t checked the stats but it is likely “broadcast”ing a hundred million websocket messages a day :)

I hope you find the motivation to spend some cycles on WS at some point. I don’t think it needs much to survive, given the good current state. Thanks for your efforts!