I am trying out multi player racing game using Node and Socket IO ,express . So I have tried simple example to see the latency between node server and the clients.
I have a draggable image in client . when I move the image ienter code heren one client ,it has to move in all clients.
so basically when I am moving the image I am sending the image position to the node server in a json format , then from there I am broadcasting to all clients. there is a ~approx 300ms latency from the time. following are the results.
Client 1 sending data to server at : 286136 (timestamp)
Server received at : 286271
Client2 received data at : 286470
Client3 received data at : 286479
Client4 received data at : 286487
Client5 received data at : 286520
the latency between move from client1 to client5 is 384ms. its too hight for a racing game ..
here is my server code.
var app = require('express').createServer();
var io = require('socket.io');
var http = require('http');
var http_server = http.createServer();
var server = http.createServer(app);
server.listen(3000);
var socket = io.listen(server,{ log: false });
socket.sockets.on('connection', function (client) {
client.on('message', function (data){
console.log("data arrived to server",new Date().getTime());
// Below both statements are giving same latency between the client 1 and client 5
client.broadcast.emit('message',data);
//socket.sockets.emit('message',data);
});
});
1) Is there any way to optimize the server code to reduce the latency?
2) is this expected latency using node and websockets ?
3) is socket io can't broadcast the data asynchronously (I mean at a same time) ?
Thanks
Kishorevarma
