express cluster 多进程

var app = require('../app');

var debug = require('debug')('hello:server');    //项目名为hello 其他的改hello

var cluster = require('cluster');

var numCPUs = require('os').cpus().length;

/**

 * Get port from environment and store in Express.

 */

if(cluster.isMaster){            //判断进程是否工作

    console.log('[master] ' + "start master...");    

    for (var i = 0; i < numCPUs; i++) {        //根据CPU通道  开启进程

         cluster.fork();

    }

    cluster.on('listening', function (worker, address) {        //为cluster绑定listening事件

        console.log('[master] ' + 'listening: worker' + worker.id + ',pid:' + worker.process.pid + ', Address:' + address.address + ":" + address.port);

    });

}else{                                                                                //进程已启动   开启http服务

console.log('[worker] ' + "start worker ..." + cluster.worker.id);    

var port = normalizePort(process.env.PORT || '3000');

app.set('port', port);

/**

* Create HTTP server.

*/

var server = http.createServer(app);

/**

* Listen on provided port, on all network interfaces.

*/

server.listen(port);

server.on('error', onError);

server.on('listening', onListening);

}