LTS 10.04, Ruby 1.9.3p194 Unicorn 4.6.2, single worker

$ ab -c 10 -n 1000 http://localhost:9007/patients/1

Document Path:          /patients/1
Document Length:        18 bytes

Grape 0.2.6

Concurrency Level:      10
Time taken for tests:   0.585 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      161000 bytes
HTML transferred:       18000 bytes
Requests per second:    1710.85 [#/sec] (mean)
Time per request:       5.845 [ms] (mean)
Time per request:       0.585 [ms] (mean, across all concurrent requests)
Transfer rate:          268.99 [Kbytes/sec] received

Grape 0.3.2

Concurrency Level:      10
Time taken for tests:   0.504 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      161000 bytes
HTML transferred:       18000 bytes
Requests per second:    1983.39 [#/sec] (mean)
Time per request:       5.042 [ms] (mean)
Time per request:       0.504 [ms] (mean, across all concurrent requests)
Transfer rate:          311.84 [Kbytes/sec] received

Sinatra 1.3.5

Concurrency Level:      10
Time taken for tests:   0.401 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      263000 bytes
HTML transferred:       18000 bytes
Requests per second:    2494.79 [#/sec] (mean)
Time per request:       4.008 [ms] (mean)
Time per request:       0.401 [ms] (mean, across all concurrent requests)
Transfer rate:          640.75 [Kbytes/sec] received

E 0.4.2

https://speakerdeck.com/slivu/espresso-framework

After having read this: https://speakerdeck.com/slivu/ruby-handling-1-million-concurrent-connections

Concurrency Level:      10
Time taken for tests:   0.250 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      154000 bytes
HTML transferred:       18000 bytes
Requests per second:    4007.86 [#/sec] (mean)
Time per request:       2.495 [ms] (mean)
Time per request:       0.250 [ms] (mean, across all concurrent requests)
Transfer rate:          602.74 [Kbytes/sec] received

This was way too exciting, so I went with 2 unicorn workers:

Concurrency Level:      100
Time taken for tests:   18.774 seconds
Complete requests:      100000
Failed requests:        0
Write errors:           0
Total transferred:      15408606 bytes
HTML transferred:       1800990 bytes
Requests per second:    5326.38 [#/sec] (mean)
Time per request:       18.774 [ms] (mean)
Time per request:       0.188 [ms] (mean, across all concurrent requests)
Transfer rate:          801.49 [Kbytes/sec] received