Node.JS php exec

gistfile1.js

//  /usr/local/src/httpd-2.3.16-beta/support/ab -r  -n 10000 -c 10 http://127.0.0.1:1327/

var http = require('http');
var sys = require('util')
var exec = require('child_process').exec;
var util = require('util');

var cnt = 0;


http.createServer(function (req, res) {
    if(cnt++ % 1000 == 0) {
	util.log('requests: ' + cnt);
	util.log(util.inspect(process.memoryUsage()));
    }
    
    child = exec("php -r 'echo \"{php_time: \" . microtime(true) . \"}\";'", function (error, stdout, stderr) {

	if (error !== null) {
	    res.writeHead(500, {
		'Content-Type': 'text/plain'
	    });
	    var r = {
		code: 500, 
		message: stdout + stderr
	    };
	    res.write(JSON.stringify(r));
	}
	else {
	    res.writeHead(200, {
		'Content-Type': 'text/plain'
	    });
	    res.write(stdout);
	}
	res.end();

    }
    );
}).listen(1327, "127.0.0.1");

util.log('Server running at http://127.0.0.1:1327/');
util.log(util.inspect(process.memoryUsage()));