spring gateway使用基于netty异步io；
zuul 1使用servlet 3，每个请求一个线程，同步Servlet，多线程阻塞模型。
而spring貌似不想在支持zuul 2了。issue
简单demo，get请求转发到http://httpbin.org/get，测试结果如下
ab -c 10 -n 1000
-
zuul 1结果
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.1 0 1
Processing: 206 300 217.1 215 2254
Waiting: 206 300 217.0 214 2254
Total: 206 300 217.1 215 2254
Percentage of the requests served within a certain time (ms)
50% 215
66% 221
75% 227
80% 247
90% 582
95% 685
98% 905
99% 1114
100% 2254 (longest request)
-
spring gateway结果
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.1 0 1
Processing: 193 281 189.4 200 2114
Waiting: 193 281 189.4 200 2113
Total: 193 281 189.4 201 2114
Percentage of the requests served within a certain time (ms)
50% 201
66% 206
75% 217
80% 233
90% 593
95% 653
98% 853
99% 1029
100% 2114 (longest request)
ab -c 50 -n 1000
-
zuul 1结果
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.6 0 4
Processing: 220 696 322.9 631 2222
Waiting: 220 695 322.8 630 2222
Total: 220 696 322.9 631 2224
Percentage of the requests served within a certain time (ms)
50% 631
66% 675
75% 736
80% 861
90% 1101
95% 1499
98% 1620
99% 1853
100% 2224 (longest request)
-
spring gateway结果
Connection Times (ms)
min mean[+/-sd] median max
Connect: 0 0 0.5 0 3
Processing: 193 274 185.6 201 1848
Waiting: 193 274 185.6 201 1848
Total: 193 274 185.7 201 1849
Percentage of the requests served within a certain time (ms)
50% 201
66% 205
75% 212
80% 223
90% 610
95% 661
98% 776
99% 1024
100% 1849 (longest request)
总结
在低并发的情况下，zuul 1和spring gateway差距并不大，
在高并发情况下，差距会很明显。
这也就是异步io和多线程阻塞模型的区别。
参考http://blog.didispace.com/api-gateway-Zuul-1-zuul-2-how-to-choose/
