Question

我正在使用apache基准测试ec2 t2.medium实例中安装的nginx服务器的性能。

当我使用private ip从ec2实例中运行apache基准测试时，我得到了这些数字：

Concurrency Level:      100
Time taken for tests:   0.042 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Keep-Alive requests:    1000
Total transferred:      608000 bytes
HTML transferred:       371000 bytes
Requests per second:    23633.40 [#/sec] (mean)
Time per request:       4.231 [ms] (mean)
Time per request:       0.042 [ms] (mean, across all concurrent requests)
Transfer rate:          14032.33 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.5      0       3
Processing:     0    4   2.3      4       8
Waiting:        0    4   2.3      3       8
Total:          0    4   2.2      4       8

Percentage of the requests served within a certain time (ms)
  50%      4
  66%      5
  75%      6
  80%      6
  90%      7
  95%      7
  98%      8
  99%      8
 100%      8 (longest request)

当使用public ip从ec2实例外部运行相同的测试时，我得到这些数字。

Concurrency Level:      100
Time taken for tests:   4.192 seconds
Complete requests:      1000
Failed requests:        0
Keep-Alive requests:    1000
Total transferred:      608000 bytes
HTML transferred:       371000 bytes
Requests per second:    238.53 [#/sec] (mean)
Time per request:       419.240 [ms] (mean)
Time per request:       4.192 [ms] (mean, across all concurrent requests)
Transfer rate:          141.63 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0   25 198.3      0    2447
Processing:    66  200 269.3     91    2672
Waiting:       66  200 269.3     90    2672
Total:         66  225 360.2     91    3930

Percentage of the requests served within a certain time (ms)
  50%     91
  66%     93
  75%    100
  80%    220
  90%    591
  95%    791
  98%   1354
  99%   1863
 100%   3930 (longest request)

当使用公共IP在ec2外部测试时，它提供大约240 rps，而当使用私有IP从ec2实例内部测试时，它提供大约235 rps。两次测试之间的处理时间显示出显着差异。请分享你的想法可能会导致rps大幅下降。

Answer 1

在测试公共IP时，您是否检查了加载计算机（运行ab）和EC2实例之间的网络连接？ m2.medium应该支持远高于141KBps

Answer 2

连接阶段有一个很大的偏差，表明包裹在线路上的某处掉落。当您已经受带宽限制时使用太多并行TCP连接将导致程序包丢失，从而导致重新传输，从而增加有效延迟。

降低并发性以消除可能的带宽问题。还要确保您不通过无线或任何其他半双工技术运行apache基准测试，因为这会导致额外的延迟甚至是高并发的包丢失。

Answer 3

这是一个古老的问题，但大多数管理员仍在努力寻找Nginx性能的正确答案。请查看以下链接了解更多详情...

http://clouditops.blogspot.com/2016/11/improve-nginx-performance.html

AWS EC2 Nginx性能

3 个答案: