apache的ab命令做压力测试

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1、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.test.com/

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

[root@Svr107 bin]# ./ab -n 3000 -c 3000 http://www.test.com/

This is ApacheBench, Version 2.3 <$Revision: 655654 $>

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

[root@Svr107 bin]# ./ab -n 1 -c 1 -v 2 http://www.test.com/

This is ApacheBench, Version 2.3 <$Revision: 655654 $>

Licensed to The Apache Software Foundation, http://www.apache.org/

Benchmarking www.test.com (be patient)...INFO: POST header ==

---

GET / HTTP/1.0

Host: www.test.com

User-Agent: ApacheBench/2.3

Accept: */*

---

LOG: header received:

HTTP/1.1 200 OK

Server: nginx/0.7.65

Date: Thu, 01 Dec 2011 13:08:16 GMT

Content-Type: text/html

Connection: close

Vary: Accept-Encoding

Content-Length: 50515

Last-Modified: Thu, 01 Dec 2011 13:08:04 GMT

Accept-Ranges: bytes

<sc< div="" style="word-wrap: break-word;">

..done

Server Software: nginx/0.7.65

Server Hostname: www.test.com

Server Port: 80

Document Path: /

Document Length: 50515 bytes

Concurrency Level: 1

Time taken for tests: 0.006 seconds

Complete requests: 1

Failed requests: 0

Write errors: 0

Total transferred: 50751 bytes

HTML transferred: 50515 bytes

Requests per second: 176.27 [#/sec] (mean)

Time per request: 5.673 [ms] (mean)

Time per request: 5.673 [ms] (mean, across all concurrent requests)

Transfer rate: 8736.39 [Kbytes/sec] received

Connection Times (ms)

min mean[+/-sd] median max

Connect: 0 0 0.0 0 0

Processing: 5 5 0.0 5 5

Waiting: 1 1 0.0 1 1

Total: 6 6 0.0 6 6

在做压力测试的时候，一般情况下压力测试客户端接收到的数据量一定会远大于发送出去的数据量

参考

http://johnnyhg.iteye.com/blog/523818

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