A constantly updated gist of a nice cluster pattern

cluster.js

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

if ( cluster.isMaster ){

    for ( var i = 0 ; i < numCPUs; i++ ){

        cluster.fork();
    }

    cluster.on( 'exit' , function( worker, code, signal ){
        console.log( 'worker' , worker.process.pid , 'died' , 'code:', code , 'signal:' , signal );
    } );

    cluster.on('online', function(worker) {
        console.log( 'worker' , worker.id , 'is up' );
    });

} else {

    http.createServer( function( req, res ){

        console.log( 'there was a request' , timeouts );
        res.writeHead( 200 );
        res.end( 'Hello World' );

    } ).listen( process.argv[2] );


}