ab是apache自带的一个很好用的压力测试工具，当安装完apache的时候，就可以在bin下面找到ab
1 我们可以模拟100个并发用户，对一个页面发送1000个请求
./ab -n1000 -c100 http://vm1.jianfeng.com/a.html
其中-n代表请求数，-c代表并发数
返回结果:
##首先是apache的版本信息 > Benchmarking vm1.jianfeng.com (be patient) Server Software: Apache/2.2.19 ##apache版本 Document Path: /a.html Concurrency Level: 100 ##并发数 Connection Times (ms) Percentage of the requests served within a certain time (ms) 2 ab也可以运行在windows中，如果在windows下安装apache,就可以在bin下找到ab.exe 直接就可以使用，不用依赖其他的dll 下面是我使用ab.exe 测试新浪一个页面的结果： C:\Users\nickyjf\Desktop\useful>ab -n1000 -c100 http://sports.sina.com.cn/k/2011-05-24/12095590365.shtml > Benchmarking sports.sina.com.cn (be patient) Server Software: Apache/2.0.63 Document Path: /k/2011-05-24/12095590365.shtml Concurrency Level: 100 Connection Times (ms) Percentage of the requests served within a certain time (ms) 3 apache的ab工具也算是一种ddos***工具 创新互联www.cdcxhl.cn，专业提供香港、美国云服务器，动态BGP最优骨干路由自动选择，持续稳定高效的网络助力业务部署。公司持有工信部办法的idc、isp许可证， 机房独有T级流量清洗系统配攻击溯源，准确进行流量调度，确保服务器高可用性。佳节活动现已开启，新人活动云服务器买多久送多久。
This is ApacheBench, Version 2.3
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
Server Hostname: vm1.jianfeng.com ##请求的机子
Server Port: 80 ##请求端口
Document Length: 25 bytes ##页面长度
Time taken for tests: 0.273 seconds ##共使用了多少时间
Complete requests: 1000 ##请求数
Failed requests: 0 ##失败请求
Write errors: 0
Total transferred: 275000 bytes ##总共传输字节数，包含http的头信息等
HTML transferred: 25000 bytes ##html字节数，实际的页面传递字节数
Requests per second: 3661.60 [#/sec] (mean) ##每秒多少请求，这个是非常重要的参数数值，服务器的吞吐量
Time per request: 27.310 [ms] (mean) ##用户平均请求等待时间
Time per request: 0.273 [ms] (mean, across all concurrent requests) ##服务器平均处理时间，也就是服务器吞吐量的倒数
Transfer rate: 983.34 [Kbytes/sec] received ##每秒获取的数据长度
min mean[+/-sd] median max
Connect: 0 1 2.3 0 16
Processing: 6 25 3.2 25 32
Waiting: 5 24 3.2 25 32
Total: 6 25 4.0 25 48
50% 25 ## 50%的请求在25ms内返回
66% 26 ## 60%的请求在26ms内返回
75% 26
80% 26
90% 27
95% 31
98% 38
99% 43
100% 48 (longest request)
This is ApacheBench, Version 2.3
Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
Licensed to The Apache Software Foundation, http://www.apache.org/
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 Hostname: sports.sina.com.cn
Server Port: 80
Document Length: 86680 bytes
Time taken for tests: 66.453 seconds
Complete requests: 1000
Failed requests: 0
Write errors: 0
Total transferred: 87135790 bytes
HTML transferred: 86680000 bytes
Requests per second: 15.05 [#/sec] (mean)
Time per request: 6645.294 [ms] (mean)
Time per request: 66.453 [ms] (mean, across all concurrent requests)
Transfer rate: 1280.51 [Kbytes/sec] received
min mean[+/-sd] median max
Connect: 1 56 398.3 2 3003
Processing: 89 6331 2603.7 6293 14626
Waiting: 2 1748 1485.9 1590 6284
Total: 90 6388 2615.0 6302 14627
50% 6302
66% 7121
75% 8435
80% 9193
90% 9231
95% 9385
98% 11549
99% 12459
100% 14627 (longest request)
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