gistfile1.txt

go and node running on MacOS Lion, i7, 8GB RAM. 
ab running on linux in a VirtualBox (on the same machine).

Script source code:
https://gist.github.com/2722169

ab command line:
ab -n 40000 -c 200 -r 192.168.1.104:1337/

Test results:
RUN 1:

Node version (4 workers):
Concurrency Level:      200
Time taken for tests:   21.348 seconds
Complete requests:      40000
Failed requests:        0
Write errors:           0
Total transferred:      3040000 bytes
HTML transferred:       480000 bytes
Requests per second:    1873.73 [#/sec] (mean)
Time per request:       106.739 [ms] (mean)
Time per request:       0.534 [ms] (mean, across all concurrent requests)
Transfer rate:          139.07 [Kbytes/sec] received


GO version:

Concurrency Level:      200
Time taken for tests:   47.130 seconds
Complete requests:      40000
Failed requests:        2061
   (Connect: 0, Receive: 687, Length: 687, Exceptions: 687)
Write errors:           0
Total transferred:      3788928 bytes
HTML transferred:       552552 bytes
Requests per second:    848.71 [#/sec] (mean)
Time per request:       235.651 [ms] (mean)
Time per request:       1.178 [ms] (mean, across all concurrent requests)
Transfer rate:          78.51 [Kbytes/sec] received

------------------------------------------------------------------

RUN 2:

Node version (4 workers):

Concurrency Level:      200
Time taken for tests:   21.262 seconds
Complete requests:      40000
Failed requests:        0
Write errors:           0
Total transferred:      3040000 bytes
HTML transferred:       480000 bytes
Requests per second:    1881.30 [#/sec] (mean)
Time per request:       106.310 [ms] (mean)
Time per request:       0.532 [ms] (mean, across all concurrent requests)
Transfer rate:          139.63 [Kbytes/sec] received


Go version:

Concurrency Level:      200
Time taken for tests:   33.212 seconds
Complete requests:      40000
Failed requests:        1548
   (Connect: 0, Receive: 516, Length: 516, Exceptions: 516)
Write errors:           0
Total transferred:      3809280 bytes
HTML transferred:       555520 bytes
Requests per second:    1204.37 [#/sec] (mean)
Time per request:       166.061 [ms] (mean)
Time per request:       0.830 [ms] (mean, across all concurrent requests)
Transfer rate:          112.01 [Kbytes/sec] received

------------------------------------------------------------------

RUN 3:
ab -n 40000 -c 50 -r 192.168.1.104:1337/
Restarted both servers. The GO results got worse each run, with more reported errors. After the restart, the test completed successfully.

Node version:
Concurrency Level:      50
Time taken for tests:   22.270 seconds
Complete requests:      40000
Failed requests:        0
Write errors:           0
Total transferred:      3040000 bytes
HTML transferred:       480000 bytes
Requests per second:    1796.14 [#/sec] (mean)
Time per request:       27.837 [ms] (mean)
Time per request:       0.557 [ms] (mean, across all concurrent requests)
Transfer rate:          133.31 [Kbytes/sec] received


GO version:
Concurrency Level:      50
Time taken for tests:   22.302 seconds
Complete requests:      40000
Failed requests:        0
Write errors:           0
Total transferred:      3840000 bytes
HTML transferred:       560000 bytes
Requests per second:    1793.60 [#/sec] (mean)
Time per request:       27.877 [ms] (mean)
Time per request:       0.558 [ms] (mean, across all concurrent requests)
Transfer rate:          168.15 [Kbytes/sec] received