Question by akashif · Apr 23, 2018 at 09:53 PM · multiplayer multiplayer-networking sockets nodejs

Massively Multiplayer Turn Based Game Performance : NodeJS or others ?

Hi,

I am in process of creating a multiplayer turn based game, and expecting it to be very popular (imagining).

I need to plan backend very carefully. So I am testing several servers which can handle several thousands clients.

I have tested nodeJS with socket.io, but that seems not a good choice. (may be I am wrong). I have tested nodeJS load with “websocket-bench” and apparently nodeJS Socket.IO starts dying on 3000 connections and on 5000 connections totally dead, while server resources are free. I have a 16GB RAM DUAL XEON (sandybridge 24 CORE) ON CENTOS 7. Overall load of server never goes above 6 and only 3GB to 6GB memory is utilized.

So I am not sure why nodeJS is not accepting more connections (I have set ulimit to 60,000).

I am using websocket-bench like this

 websocket-bench -a 2000 -c 1000   http://localhost:3000/

and socket.io server is very simple.

 // JavaScript Document
 var io = require('socket.io')(process.env.PORT || 3000);
 console.log('server started.');
 var _clients=0;
 io.on('connection', function (socket) {
         _clients++;
         console.log('Connections: '+_clients);
 
   socket.on('disconnect', function () {
     io.emit('user disconnected');
         _clients--;
         console.log('Connections: '+_clients);
 
   });
 
 });

Considering this background, I have 2 questions,

1) What wrong I am doing with my nodeJS setup. Am I missing something to get high very performance.
2) For a massively played turn based game what server should I use?

Thank You

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