nodejs work in cluster

nodejs小练习

直接上源码，ps(他的集群可以共享连接，共享端口，这点很赞)

var cluster = require('cluster');
var http    = require('http');
var os      = require('os');

var numCPUs = os.cpus().length;

var sleep = function(time_ms){
    var startTime = new Date().getTime();
    while (new Date().getTime() < startTime + time_ms);
}

if (cluster.isMaster) {
    // Master:
    // Let's fork as many workers as you have CPU cores

    for (var i = 0; i < numCPUs; ++i) {
        cluster.fork();
    }
} else {
    // Worker:
    // Let's spawn a HTTP server
    // (Workers can share any TCP connection.
    //  In this case its a HTTP server)

    http.createServer(function(req, res) {
        res.writeHead(200);
        res.end("hello world\n" + process.pid);
        sleep(1000);
    }).listen(8080);
}