一：ab.exe的使用
ab.exe是Apache附带的压力测试工具，可以在web服务器本地模拟发起测试请求

1：进入Apache的bin目录

#输入命令
ab.exe -n 1000 -c 100 http://localhost/test/index.php;

index.php

<?php
#用循环来模拟处理业务逻辑
for($i = 0; $i <= 100; $i++) {
    echo $i . '|';
}

CMD测试数据

Server Software:        Apache/2.4.23
Server Hostname:        localhost
Server Port:            80

Document Path:          /index.php;
Document Length:        208 bytes

Concurrency Level:      100
Time taken for tests:   0.314 seconds   #访问的总时间
Complete requests:      1000            #访问的总次数
Failed requests:        0               #失败的访问次数
Non-2xx responses:      1000            
Total transferred:      418000 bytes
HTML transferred:       208000 bytes
Requests per second:    3182.42 [#/sec] (mean)   #每秒访问多少次
Time per request:       31.423 [ms] (mean)    #这么多人（100人）访问一次的时间
Time per request:       0.314 [ms] (mean, across all concurrent requests)
Transfer rate:          1299.07 [Kbytes/sec] received

Connection Times (ms)
              min  mean[+/-sd] median   max
Connect:        0    0   0.3      0       1
Processing:     6   30   4.5     31      46
Waiting:        3   22   6.2     23      39
Total:          6   30   4.5     31      46

Percentage of the requests served within a certain time (ms)
  50%     31
  66%     32
  75%     32
  80%     32
  90%     33
  95%     34
  98%     37
  99%     37
 100%     46 (longest request)

2、增大并发数到500

ab.exe -n 10000 -c 500 http://localhost/test/index.php;

会出现下面的情况

Benchmarking localhost (be patient)
Completed 1000 requests

Test aborted after 10 failures

apr_socket_connect(): 由于目标计算机积极拒绝，无法连接。   (730061)
Total of 1299 requests completed

是因为Apache默认的最大并发数是150
可以更改conf/extra/httpd-mpm.conf来更改最大并发数

二：
打开httpd.conf配置文件，打开下面的配置

# Server-poolmanagement (MPM specific)

Include conf/extra/httpd-mpm.conf

在apache/bin 目录下 输入

httpd.exe -l;

显示

Compiled in modules:
  core.c
  mod_win32.c
  mpm_winnt.c     #说明是winnt模式
  http_core.c
  mod_so.c

打开conf/extra/httpd-mpm.conf文件
找到

<IfModule mpm_winnt_module>
    ThreadsPerChild      150     #改成1000即可
    MaxRequestsPerChild    3000   
</IfModule>

重启服务器，重新运行

ab.exe -n 10000 -c 500 http://localhost/test/index.php;

会出现相似的结果

如果是其它模式，更改httpd-mpm.conf对应的位置即可

<IfModule mpm_prefork_module>  
   StartServers             5                  #开始启动的进程  
   MinSpareServers          5                  #最小准备进程  
   MaxSpareServers         10                  #最大空闲进程  
   MaxRequestWorkers      1000                 #最大并发数  
   MaxConnectionsPerChild   0  
</IfModule>