Java AIO

  $ ab -n 30000 -c 300 http://127.0.0.1:8080/
  Concurrency Level:      300
  Time taken for tests:   4.908 seconds
  Complete requests:      30000
  Requests per second:    6112.65 [#/sec] (mean)

Node (January 2011)

  $ ab -n 30000 -c 300 http://127.0.0.1:8124/
  Concurrency Level:      300
  Time taken for tests:   8.140 seconds
  Complete requests:      30000
  Requests per second:    3685.69 [#/sec] (mean)

http://www.olympum.com/java/java-aio-vs-nodejs/