Thin won out in pretty much every category showing it can handle a larger volume of traffic faster than mongrel can.

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MONGREL

Server Software: Mongrel
Server Hostname: 127.0.0.1
Server Port: 3000
Document Path: /
Document Length: 1184 bytes
Concurrency Level: 10
Time taken for tests: 65.020 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Total transferred: 1722107 bytes
HTML transferred: 1184000 bytes
Requests per second: 15.38 #/sec
Time per request: 650.195 ms
Time per request: 65.020 ms
Transfer rate: 25.87 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 2.2 0 60
Processing: 290 647 76.9 618 966
Waiting: 174 599 67.2 576 930
Total: 291 648 77.0 618 968
Percentage of the requests served within a certain time (ms)
50% 618
66% 675
75% 695
80% 704
90% 750
95% 795
98% 866
99% 896
100% 968 (longest request)

THIN
Server Software: thin
Server Hostname: 127.0.0.1
Server Port: 3000
Document Path: /
Document Length: 1184 bytes
Concurrency Level: 10
Time taken for tests: 53.618 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Total transferred: 1685045 bytes
HTML transferred: 1184000 bytes
Requests per second: 18.65 #/sec
Time per request: 536.184 ms
Time per request: 53.618 ms
Transfer rate: 30.69 [Kbytes/sec] received
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.7 0 17
Processing: 35 534 100.8 512 1115
Waiting: 35 485 110.8 502 879
Total: 36 535 100.9 513 1116
Percentage of the requests served within a certain time (ms)
50% 513
66% 549
75% 570
80% 577
90% 657
95% 710
98% 799
99% 880
100% 1116 (longest request)