node v0.8.8 vs node v0.6.14 (with and without node's cluster module) - Intel 2330M w/ 4cpus @ 2.2ghz and 8gb ram

ab-test-0.6.14-with-cluster.txt

atlantis@atlantis ~/Public $ ab -k -n 50000 -c 100 -t 20 http://dev.startup.com:3000/
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking dev.startup.com (be patient)
Finished 572 requests


Server Software:        
Server Hostname:        dev.startup.com
Server Port:            3000

Document Path:          /
Document Length:        34306 bytes

Concurrency Level:      100
Time taken for tests:   20.100 seconds
Complete requests:      572
Failed requests:        0
Write errors:           0
Keep-Alive requests:    572
Total transferred:      19817196 bytes
HTML transferred:       19623032 bytes
Requests per second:    28.46 [#/sec] (mean)
Time per request:       3513.949 [ms] (mean)
Time per request:       35.139 [ms] (mean, across all concurrent requests)
Transfer rate:          962.83 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   1.1      0       5
Processing:  1303 3149 1464.9   2522    6244
Waiting:     1303 3149 1464.9   2522    6244
Total:       1307 3150 1464.9   2522    6244

Percentage of the requests served within a certain time (ms)
  50%   2522
  66%   3927
  75%   4701
  80%   4788
  90%   5431
  95%   5609
  98%   5722
  99%   6000
 100%   6244 (longest request)

ab-test-0.6.14-without-cluster.txt

atlantis@atlantis ~/Public $ ab -k -n 50000 -c 100 -t 20 http://dev.startup.com:3000/
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking dev.startup.com (be patient)
Finished 321 requests


Server Software:        
Server Hostname:        dev.startup.com
Server Port:            3000

Document Path:          /
Document Length:        34306 bytes

Concurrency Level:      100
Time taken for tests:   20.231 seconds
Complete requests:      321
Failed requests:        0
Write errors:           0
Keep-Alive requests:    321
Total transferred:      11121337 bytes
HTML transferred:       11012226 bytes
Requests per second:    15.87 [#/sec] (mean)
Time per request:       6302.425 [ms] (mean)
Time per request:       63.024 [ms] (mean, across all concurrent requests)
Transfer rate:          536.84 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   1.5      0       6
Processing:   884 5289 1529.7   5991    6439
Waiting:      884 5289 1529.7   5991    6439
Total:        886 5290 1528.6   5991    6439

Percentage of the requests served within a certain time (ms)
  50%   5991
  66%   6117
  75%   6137
  80%   6152
  90%   6257
  95%   6325
  98%   6433
  99%   6436
 100%   6439 (longest request)

ab-test-0.8.8-with-cluster.txt

atlantis@atlantis ~/Public $ ab -k -n 50000 -c 100 -t 20 http://dev.startup.com:3000/
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking dev.startup.com (be patient)
Finished 612 requests


Server Software:        
Server Hostname:        dev.startup.com
Server Port:            3000

Document Path:          /
Document Length:        34306 bytes

Concurrency Level:      100
Time taken for tests:   20.006 seconds
Complete requests:      612
Failed requests:        0
Write errors:           0
Keep-Alive requests:    612
Total transferred:      21225656 bytes
HTML transferred:       20995272 bytes
Requests per second:    30.59 [#/sec] (mean)
Time per request:       3268.883 [ms] (mean)
Time per request:       32.689 [ms] (mean, across all concurrent requests)
Transfer rate:          1036.12 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   1.1      0       4
Processing:    65 2917 2832.3    580    6759
Waiting:       65 2917 2832.3    580    6759
Total:         65 2918 2832.7    580    6759

Percentage of the requests served within a certain time (ms)
  50%    580
  66%   5411
  75%   5494
  80%   6243
  90%   6293
  95%   6730
  98%   6744
  99%   6750
 100%   6759 (longest request)

ab-test-0.8.8-without-cluster.txt

atlantis@atlantis ~/Public $ ab -k -n 50000 -c 100 -t 20 http://dev.startup.com:3000/
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking dev.startup.com (be patient)
Finished 355 requests


Server Software:        
Server Hostname:        dev.startup.com
Server Port:            3000

Document Path:          /
Document Length:        34306 bytes

Concurrency Level:      100
Time taken for tests:   21.780 seconds
Complete requests:      355
Failed requests:        0
Write errors:           0
Keep-Alive requests:    355
Total transferred:      12312356 bytes
HTML transferred:       12178630 bytes
Requests per second:    16.30 [#/sec] (mean)
Time per request:       6135.138 [ms] (mean)
Time per request:       61.351 [ms] (mean, across all concurrent requests)
Transfer rate:          552.06 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   1.5      0       6
Processing:  3726 5150 636.3   5345    5924
Waiting:     3726 5150 636.3   5345    5924
Total:       3727 5151 635.6   5345    5927

Percentage of the requests served within a certain time (ms)
  50%   5345
  66%   5370
  75%   5407
  80%   5415
  90%   5916
  95%   5921
  98%   5924
  99%   5925
 100%   5927 (longest request)