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ab -n 10000 -c 100 http://localhost:8000

eventmachine:

  Requests per second:    2495.36 [#/sec] (mean)
  Time per request:       40.074 [ms] (mean)


node.js:

  Requests per second:    1461.95 [#/sec] (mean)
  Time per request:       68.402 [ms] (mean)

em_http.rb

# gem install eventmachine eventmachine_httpserver em-mysql mysqlplus

require 'eventmachine'
require 'evma_httpserver'
require 'em/mysql'


EventedMysql.settings.update :host => "127.0.0.1", :port => 3306, :database => "mysql"

module HttpServer
  include EM::HttpServer

  def process_http_request
    response = EM::DelegatedHttpResponse.new(self)
    response.content_type 'text/html'
    response.status = 200

    EventedMysql.select("SELECT NOW() AS time") do |result|
      response.content = result.first["time"]
      response.send_response
    end
  end
end

EM.run do
  EM.start_server "127.0.0.1", 8000, HttpServer
end

node_http.js

// npm install mysql

var http = require('http');
var mysql = require('mysql');
var client = new mysql.Client();

client.user = "root";
client.connect();

http.createServer(function(req, res) {
  res.writeHead(200, {'Content-Type': 'text/html'});
    client.query("SELECT NOW() AS time", function(err, result, fields) {
        res.write(result[0].time.toString());
        res.end();
      });
}).listen(8000, 'localhost');