背景
ab小型压力工具，对于在Linux中简单调试还是比较方便，轻巧灵活.
安装
1. yum -y install httpd-tools查看版本
1. [root@7dgroup2 ~]# ab -V
2. This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
3. Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
4. Licensed to The Apache Software Foundation, http://www.apache.org/
5.
6. 帮助
7. [root@7dgroup2 ~]# ab help
8. ab: invalid URL
9. Usage: ab [options] [http[s]://]hostname[:port]/path
10. Options are:
11. -n requests Number of requests to perform
12. -c concurrency Number of multiple requests to make at a time
13. -t timelimit Seconds to max. to spend on benchmarking
14. This implies -n 50000
15. -s timeout Seconds to max. wait for each response
16. Default is 30 seconds
17. -b windowsize Size of TCP send/receive buffer, in bytes
18. -B address Address to bind to when making outgoing connections
19. -p postfile File containing data to POST. Remember also to set -T
20. -u putfile File containing data to PUT. Remember also to set -T
21. -T content-type Content-type header to use for POST/PUT data, eg.
22. 'application/x-www-form-urlencoded'
23. Default is 'text/plain'
24. -v verbosity How much troubleshooting info to print
25. -w Print out results in HTML tables
26. -i Use HEAD instead of GET
27. -x attributes String to insert as table attributes
28. -y attributes String to insert as tr attributes
29. -z attributes String to insert as td or th attributes
30. -C attribute Add cookie, eg. 'Apache=1234'. (repeatable)
31. -H attribute Add Arbitrary header line, eg. 'Accept-Encoding: gzip'
32. Inserted after all normal header lines. (repeatable)
33. -A attribute Add Basic WWW Authentication, the attributes
34. are a colon separated username and password.
35. -P attribute Add Basic Proxy Authentication, the attributes
36. are a colon separated username and password.
37. -X proxy:port Proxyserver and port number to use
38. -V Print version number and exit
39. -k Use HTTP KeepAlive feature
40. -d Do not show percentiles served table.
41. -S Do not show confidence estimators and warnings.
42. -q Do not show progress when doing more than 150 requests
43. -g filename Output collected data to gnuplot format file.
44. -e filename Output CSV file with percentages served
45. -r Don't exit on socket receive errors.
46. -h Display usage information (this message)
47. -Z ciphersuite Specify SSL/TLS cipher suite (See openssl ciphers)
48. -f protocol Specify SSL/TLS protocol
49. (SSL3, TLS1, TLS1.1, TLS1.2 or ALL)
50. [root@7dgroup2 ~]#- -n在测试会话中所执行的请求个数。默认时，仅执行一个请求。
- -c一次产生的请求个数。默认是一次一个。
- -t测试所进行的最大秒数。其内部隐含值是-n 50000，它可以使对服务器的测试限制在一个固定的总时间以内。默认时，没有时间限制。
快速上手
1. [root@7dgroup2 ~]# ab -n10 -c 10 http://172.17.211.142:8089/
2. This is ApacheBench, Version 2.3 <$Revision: 1430300 $>
3. Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/
4. Licensed to The Apache Software Foundation, http://www.apache.org/
5.
6. Benchmarking 172.17.211.142 (be patient).....done
7.
8.
9. Server Software: #服务器软件
10. Server Hostname: 172.17.211.142 #域名
11. Server Port: 8089 #请求端口号
12.
13. Document Path: / #文件路径
14. Document Length: 76443 bytes #页面字节数
15.
16. Concurrency Level: 10 #请求的并发数
17. Time taken for tests: 0.064 seconds #总访问时间
18. Complete requests: 10 #请求成功数量
19. Failed requests: 0 #请求失败数量
20. Write errors: 0
21. Total transferred: 766030 bytes #请求总数据大小（包括header头信息）
22. HTML transferred: 764430 bytes #html页面实际总字节数
23. Requests per second: 157.09 [#/sec] (mean) #每秒多少请求,服务器的吞吐量
24. Time per request: 63.656 [ms] (mean) #用户平均请求等待时间
25. Time per request: 6.366 [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
26. Transfer rate: 11751.86 [Kbytes/sec] received #每秒获取的数据长度
27.
28. Connection Times (ms)
29. min mean[+/-sd] median max
30. Connect: 0 0 0.0 0 0 #网络链接
31. Processing: 8 36 17.1 41 60 #系统处理
32. Waiting: 3 24 18.7 18 55 #等待
33. Total: 9 37 17.1 42 60- #Total并不等于前三行数据相加，因为前三行的数据并不是在同一个请求中采集到的，
- #可能某个请求的网络延迟最短，但是系统处理时间又是最长的呢。
- #所以Total是从整个请求所需要的时间的角度来统计的。
2. Percentage of the requests served within a certain time (ms)
3. 50% 42
4. 66% 45
5. 75% 51
6. 80% 52
7. 90% 60
8. 95% 60
9. 98% 60
10. 99% 60
11. 100% 60 (longest request)
