Rackspace Load Balancing

1 processing server

Server Software:        nginx/0.7.67
Server Hostname:        rackspace.weldr.me
Server Port:            80

Document Path:          /profile/jacobh/
Document Length:        12472 bytes

Concurrency Level:      128
Time taken for tests:   67.230 seconds
Complete requests:      2000
Failed requests:        0
Write errors:           0
Total transferred:      25246000 bytes
HTML transferred:       24944000 bytes
Requests per second:    29.75 [#/sec] (mean)
Time per request:       4302.733 [ms] (mean)
Time per request:       33.615 [ms] (mean, across all concurrent requests)
Transfer rate:          366.71 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0  200 818.6      0    9022
Processing:   180 3971 752.2   4133    4685
Waiting:      180 3970 752.2   4132    4685
Total:        180 4171 838.2   4146   13418

Percentage of the requests served within a certain time (ms)
  50%   4146
  66%   4192
  75%   4227
  80%   4262
  90%   4361
  95%   4492
  98%   6428
  99%   7178
 100%  13418 (longest request)

2 processing servers

Server Software:        nginx/0.7.67
Server Hostname:        rackspace.weldr.me
Server Port:            80

Document Path:          /profile/jacobh/
Document Length:        12472 bytes

Concurrency Level:      128
Time taken for tests:   44.698 seconds
Complete requests:      2000
Failed requests:        0
Write errors:           0
Total transferred:      25246000 bytes
HTML transferred:       24944000 bytes
Requests per second:    44.74 [#/sec] (mean)
Time per request:       2860.695 [ms] (mean)
Time per request:       22.349 [ms] (mean, across all concurrent requests)
Transfer rate:          551.57 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   1.2      0       6
Processing:   269 2750 775.3   2525    3773
Waiting:      269 2749 775.3   2525    3772
Total:        275 2751 774.8   2528    3773

Percentage of the requests served within a certain time (ms)
  50%   2528
  66%   3446
  75%   3545
  80%   3575
  90%   3619
  95%   3651
  98%   3678
  99%   3692
 100%   3773 (longest request)

3 processing servers

Server Software:        nginx/0.7.67
Server Hostname:        rackspace.weldr.me
Server Port:            80

Document Path:          /profile/jacobh/
Document Length:        12472 bytes

Concurrency Level:      128
Time taken for tests:   44.139 seconds
Complete requests:      2000
Failed requests:        0
Write errors:           0
Total transferred:      25246000 bytes
HTML transferred:       24944000 bytes
Requests per second:    45.31 [#/sec] (mean)
Time per request:       2824.926 [ms] (mean)
Time per request:       22.070 [ms] (mean, across all concurrent requests)
Transfer rate:          558.55 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   1.4      0       8
Processing:   298 2742 393.5   2791    3281
Waiting:      297 2741 393.5   2790    3281
Total:        305 2742 392.3   2791    3281

Percentage of the requests served within a certain time (ms)
  50%   2791
  66%   2889
  75%   2950
  80%   2979
  90%   3052
  95%   3103
  98%   3153
  99%   3208
 100%   3281 (longest request)

4 processing servers

Server Software:        nginx/0.7.67
Server Hostname:        rackspace.weldr.me
Server Port:            80

Document Path:          /profile/jacobh/
Document Length:        12472 bytes

Concurrency Level:      128
Time taken for tests:   44.798 seconds
Complete requests:      2000
Failed requests:        0
Write errors:           0
Total transferred:      25246000 bytes
HTML transferred:       24944000 bytes
Requests per second:    44.64 [#/sec] (mean)
Time per request:       2867.073 [ms] (mean)
Time per request:       22.399 [ms] (mean, across all concurrent requests)
Transfer rate:          550.34 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   1.3      0       6
Processing:   549 2754 1508.9   2320    7835
Waiting:      549 2754 1508.9   2319    7829
Total:        556 2755 1508.7   2320    7835

Percentage of the requests served within a certain time (ms)
  50%   2320
  66%   2532
  75%   2668
  80%   2889
  90%   5392
  95%   6573
  98%   7430
  99%   7653
 100%   7835 (longest request)

5 processing servers

Server Software:        nginx/0.7.67
Server Hostname:        rackspace.weldr.me
Server Port:            80

Document Path:          /profile/jacobh/
Document Length:        12472 bytes

Concurrency Level:      128
Time taken for tests:   44.979 seconds
Complete requests:      2000
Failed requests:        0
Write errors:           0
Total transferred:      25246000 bytes
HTML transferred:       24944000 bytes
Requests per second:    44.47 [#/sec] (mean)
Time per request:       2878.632 [ms] (mean)
Time per request:       22.489 [ms] (mean, across all concurrent requests)
Transfer rate:          548.13 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    1   1.2      0       6
Processing:   564 2756 1683.7   2313    7937
Waiting:      564 2756 1683.7   2313    7931
Total:        570 2757 1683.5   2314    7938

Percentage of the requests served within a certain time (ms)
  50%   2314
  66%   2620
  75%   2826
  80%   3050
  90%   5712
  95%   6823
  98%   7409
  99%   7587
 100%   7938 (longest request)

Command

ab -n2000 -c128 http://rackspace.weldr.me/profile/jacobh/

(issued from another rackspace virtual server)