Simple HTTP server using the unstable cluster module in Node.js. Using named functions reduces the amount of memory held.

app.js

var http = require('http');

var server = http.createServer(serverRequestEvent);

server.listen(8080, serverListeningEvent);

function serverRequestEvent(request, response) {
    response.writeHead(200, {'Content-Type': 'text/plain'});
    response.write('Hello World');
    response.end();
}

function serverListeningEvent() {
    var server_address = server.address();
    console.log('%s listening on port: %s', server_address.address, server_address.port);
}

package.json

{
    "name": "clustered-http-server-test",
    "version": "0.0.1",
    "dependencies": {}
}

server.js

var http = require('http');

var cluster = require('cluster');
var num_child_processes = require('os').cpus().length;

cluster.setupMaster({
    exec : "app.js",
    silent : false
});

console.log('Master PID:', process.pid);


cluster.on('listening', clusterWorkerListenEvent);
cluster.on('exit', clusterWorkerExitEvent);

// Fork workers.
for (var i = 0; i < num_child_processes; i++) {
    cluster.fork();
}


function clusterWorkerListenEvent(worker, address) {
    console.log("A worker is now connected to " + address.address + ":" + address.port + ' with PID: %s', worker.process.pid);
}

function clusterWorkerExitEvent(worker, code, signal) {
    var exitCode = worker.process.exitCode;
    
    console.log('worker %s died (%s). restarting...', worker.process.pid, exitCode);
    cluster.fork();
}