Node.js vs EventMachine

em-http-serv.rb

require 'eventmachine'
require 'evma_httpserver'

class MyHttpServer < EM::Connection
  include EM::HttpServer

   def post_init
     super
     no_environment_strings
   end

  def process_http_request
    response = EM::DelegatedHttpResponse.new(self)
    response.status = 200
    response.content_type 'text/plain'
    response.content = 'Hello World\n'
    response.send_response
  end
end

EM.run{
  EM.start_server '0.0.0.0', 8080, MyHttpServer
}

nodejs-example.js

var http = require('http');
http.createServer(function (req, res) {
  res.writeHead(200, {'Content-Type': 'text/plain'});
  res.end('Hello World\n');
}).listen(8124, "127.0.0.1");

results.txt

Apache 2.2.17 (for reference)
--------------
Server Software:        Apache/2.2.17
Server Hostname:        localhost
Server Port:            80

Document Path:          /
Document Length:        13 bytes

Concurrency Level:      100
Time taken for tests:   1.015 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      2990299 bytes
HTML transferred:       130013 bytes
Requests per second:    9856.85 [#/sec] (mean)
Time per request:       10.145 [ms] (mean)
Time per request:       0.101 [ms] (mean, across all concurrent requests)
Transfer rate:          2878.41 [Kbytes/sec] received




Node.js 0.4.2
--------------
Server Software:        
Server Hostname:        127.0.0.1
Server Port:            8124

Document Path:          /
Document Length:        12 bytes

Concurrency Level:      100
Time taken for tests:   1.334 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      760000 bytes
HTML transferred:       120000 bytes
Requests per second:    7496.66 [#/sec] (mean)
Time per request:       13.339 [ms] (mean)
Time per request:       0.133 [ms] (mean, across all concurrent requests)
Transfer rate:          556.39 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.3      0       4
Processing:     1   13   6.2     13      31
Waiting:        1   13   6.2     13      30
Total:          2   13   6.2     13      31

Percentage of the requests served within a certain time (ms)
  50%     13
  66%     16
  75%     18
  80%     19
  90%     22
  95%     23
  98%     25
  99%     27
 100%     31 (longest request)




EventMachine 0.12.10 (MRI 1.8.7)
--------------------------------
Server Software:        
Server Hostname:        127.0.0.1
Server Port:            8080

Document Path:          /
Document Length:        13 bytes

Concurrency Level:      100
Time taken for tests:   1.063 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      790711 bytes
HTML transferred:       130117 bytes
Requests per second:    9407.26 [#/sec] (mean)
Time per request:       10.630 [ms] (mean)
Time per request:       0.106 [ms] (mean, across all concurrent requests)
Transfer rate:          726.41 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.4      0      10
Processing:     2   10   4.1      9      25
Waiting:        1    9   4.0      8      25
Total:          5   11   4.0      9      26

Percentage of the requests served within a certain time (ms)
  50%      9
  66%     10
  75%     10
  80%     10
  90%     19
  95%     22
  98%     24
  99%     25
 100%     26 (longest request)




EventMachine 0.12.10 (YARV 1.9.2)
---------------------------------
Server Software:        
Server Hostname:        127.0.0.1
Server Port:            8080

Document Path:          /
Document Length:        13 bytes

Concurrency Level:      100
Time taken for tests:   0.868 seconds
Complete requests:      10000
Failed requests:        0
Write errors:           0
Total transferred:      790316 bytes
HTML transferred:       130052 bytes
Requests per second:    11522.97 [#/sec] (mean)
Time per request:       8.678 [ms] (mean)
Time per request:       0.087 [ms] (mean, across all concurrent requests)
Transfer rate:          889.33 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.4      0       4
Processing:     1    8   3.3      8      18
Waiting:        1    8   3.2      7      18
Total:          4    9   3.2      8      19

Percentage of the requests served within a certain time (ms)
  50%      8
  66%      8
  75%      8
  80%      9
  90%     15
  95%     17
  98%     18
  99%     18
 100%     19 (longest request)

Awesome. Do you run node in production mode?