- ab命令格式
ab命令放在apache目录bin目录下面，使用方法如下：
/ab -n 3000 -c 3000 http://www.local.com/(此为服务器下测试的页面地址)
其中-n代表每次并发量，-c代表总共发送的数量
2、测试结果分析
[[email protected] bin]# ./ab -n 3000 -c 3000 http://www.local.com/
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 www.twioo.com (be patient)
Completed 300 requests
Completed 600 requests
Completed 900 requests
Completed 1200 requests
Completed 1500 requests
Completed 1800 requests
Completed 2100 requests
Completed 2400 requests
Completed 2700 requests
Completed 3000 requests
Finished 3000 requests
Server Software: nginx/0.7.65
Server Hostname: www.test.com
Server Port: 80
Document Path: / ###请求的资源
Document Length: 50679 bytes ###文档返回的长度，不包括相应头
Concurrency Level: 3000 ###并发个数
Time taken for tests: 30.449 seconds ###总请求时间
Complete requests: 3000 ###总请求数
Failed requests: 0 ###失败的请求数
Write errors: 0
Total transferred: 152745000 bytes
HTML transferred: 152037000 bytes
Requests per second: 98.52 [#/sec] (mean) ###平均每秒的请求数
Time per request: 30449.217 [ms] (mean) ###平均每个请求消耗的时间
Time per request: 10.150 [ms] (mean, across all concurrent requests) ###上面的请求除以并发数
Transfer rate: 4898.81 [Kbytes/sec] received ###传输速率
Connection Times (ms)
min mean[+/-sd] median max
Connect: 2 54 27.1 55 98
Processing: 51 8452 5196.8 7748 30361
Waiting: 50 6539 5432.8 6451 30064
Total: 54 8506 5210.5 7778 30436
Percentage of the requests served within a certain time (ms)
50% 7778 ###50%的请求都在7778Ms内完成
66% 11059
75% 11888
80% 12207
90% 13806
95% 18520
98% 24232
99% 24559
100% 30436 (longest request)
3、如果用ab访问的是他本机上的web服务器，使用127.0.0.1或者是web服务器上的网卡IP地址，这个是不走网络设备的，可以忽略网络消耗
4、ab使用的一些问题
a、ab命令在一般系统上面做测试时候，一般并发不能超过1024个，其实是因为因为系统限制每个进程打开的最大文件数为1024，可以用ulimit -a来查看
open files (-n) 65536 ##这个我系统已经修改过
b、-n 可以指定最大请求数，但是不能超过50000个
c、-v n 当n>=2 时，可以显示发送的http请求头，和响应的http头及内容,压力测试时不要这么做