以下是 ab 壓力測試的結果（為了得到比較科學的資料可以進行多次的測試，一般至少10次）

ab 可執行檔案的位置 /usr/local/web/apache/bin
測試命令：ab -n1000 -c100 192.168.1.155:9090/index.html

[root@bogon bin]# pwd
/usr/local/web/apache/bin
[root@bogon bin]# ab -n1000 -c100 ip:port/index.html

一、測試結果：

1、tomcat 處理靜態請求

[[email protected] bin]# pwd
/usr/local/web/apache/bin
[
 
[email protected] bin]# ab -n1000 -c100 192.168.1.155:9090/index.html
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 192.168.1.155 (be patient)
Completed 100
 
 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Completed 1000 requests
Finished 1000 requests


Server Software:        Apache-Coyote/1.1
Server Hostname:        192.168.1.155
Server Port:            9090
 


Document Path:          /index.html
Document Length:        119 bytes

Concurrency Level:      100
Time taken for tests:   0.895 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      385476 bytes
HTML transferred:       126021 bytes
Requests per second:    1117.31 [#/sec] (mean)
Time per request:       89.501 [ms] (mean)
Time per request:       0.895 [ms] (mean, across all concurrent requests)
Transfer rate:          420.60 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0   34  18.3     37      77
Processing:     7   42  18.5     38     100
Waiting:        4   33  16.8     29      94
Total:         19   76  17.7     78     170

Percentage of the requests served within a certain time (ms)
  50%     78
  66%     85
  75%     87
  80%     90
  90%     96
  95%    102
  98%    104
  99%    112
 100%    170 (longest request)

2、Nginx 處理靜態請求

[[email protected] bin]# pwd
/usr/local/web/apache/bin
[[email protected] bin]# ab -n1000 -c100 192.168.1.155:8888/index.html
This is ApacheBench, Version 2.3 <$Revision: 655654 $>
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking 192.168.1.155 (be patient)
Completed 100 requests
Completed 200 requests
Completed 300 requests
Completed 400 requests
Completed 500 requests
Completed 600 requests
Completed 700 requests
Completed 800 requests
Completed 900 requests
Completed 1000 requests
Finished 1000 requests


Server Software:        nginx/1.11.9
Server Hostname:        192.168.1.155
Server Port:            8888

Document Path:          /index.html
Document Length:        123 bytes

Concurrency Level:      100
Time taken for tests:   0.207 seconds
Complete requests:      1000
Failed requests:        0
Write errors:           0
Total transferred:      451339 bytes
HTML transferred:       130011 bytes
Requests per second:    4841.40 [#/sec] (mean)
Time per request:       20.655 [ms] (mean)
Time per request:       0.207 [ms] (mean, across all concurrent requests)
Transfer rate:          2133.90 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        1    8   3.7      8      18
Processing:     2   10   4.8     11      25
Waiting:        0    7   3.4      7      16
Total:          4   19   6.9     21      35

Percentage of the requests served within a certain time (ms)
  50%     21
  66%     23
  75%     24
  80%     25
  90%     27
  95%     27
  98%     34
  99%     34
 100%     35 (longest request)

二、結果分析

1、tomcat 處理靜態請求

2、Nginx 處理靜態請求

三、總結

吞吐量，每個請求的處理時間等，Nginx代理處理靜態請求 都是優於 Tomcat處理

相同的處理靜態檔案，Nginx處理的靜態效能比Tomcat 好

一般在Nginx配置檔案中，配置靜態交給Nginx處理，動態請求交給Tomcat，提高了效能

Nginx +Tomcat 負載均衡與容錯

在高併發的情況下，為了提高伺服器的效能，減少了單臺伺服器的併發壓力，我們採用了叢集部署，還能解決為了避免單臺伺服器掛掉，服務不能訪問這種情況下，處理容錯問題