参数说明
ab.exe是一个性能检测工具，是apache server中的一个小组件，使用简单，方便。
执行程序ab.exe位于apache项目bin目录下，使用cmd命令执行
Options are:
-n requests Number of requests to perform
-c concurrency Number of multiple requests to make at a time
-t timelimit Seconds to max. to spend on benchmarking
This implies -n 50000
-s timeout Seconds to max. wait for each response
Default is 30 seconds
-b windowsize Size of TCP send/receive buffer, in bytes
-B address Address to bind to when making outgoing connections
-p postfile File containing data to POST. Remember also to set -T
-u putfile File containing data to PUT. Remember also to set -T
-T content-type Content-type header to use for POST/PUT data, eg.
'application/x-www-form-urlencoded'
Default is 'text/plain'
-v verbosity How much troubleshooting info to print
-w Print out results in HTML tables
-i Use HEAD instead of GET
-x attributes String to insert as table attributes
-y attributes String to insert as tr attributes
-z attributes String to insert as td or th attributes
-C attribute Add cookie, eg. 'Apache=1234'. (repeatable)
-H attribute Add Arbitrary header line, eg. 'Accept-Encoding: gzip'
Inserted after all normal header lines. (repeatable)
-A attribute Add Basic WWW Authentication, the attributes
are a colon separated username and password.
-P attribute Add Basic Proxy Authentication, the attributes
are a colon separated username and password.
-X proxy:port Proxyserver and port number to use
-V Print version number and exit
-k Use HTTP KeepAlive feature
-d Do not show percentiles served table.
-S Do not show confidence estimators and warnings.
-q Do not show progress when doing more than 150 requests
-l Accept variable document length (use this for dynamic pages)
-g filename Output collected data to gnuplot format file.
-e filename Output CSV file with percentages served
-r Don't exit on socket receive errors.
-m method Method name
-h Display usage information (this message)
-n 请求的总数，默认是1次。
-c 并发数，同一时间请求数。
-p 如果后面接的是文件，表示POST请求，文件中包含请求数据，根据数据格式，设置-T参数。
-T 设置请求头中的Content-type（针对POST/PUT），比如：application/x-www-form-urlencoded。默认是text/plain。
-w 将测试结果打印到HTML表格中。
命令示例
ab -c 10 -n 500 -p postdata.json -T application/json 192.168.1.80:8080/v1/js-executor/js
ab -c 1 -n 500 /
ab -c 10 -n 500 /
ab -c 20 -n 500 /
ab -c 20 -n 500 http://kanbook.net/ //不支持https执行结果
Server Software: nginx
Server Hostname: me.weiguo.blog
Server Port: 80
Document Path: /
Document Length: 14814 bytes
Concurrency Level: 100
Time taken for tests: 0.655 seconds /*整个测试持续的时间*/
Complete requests: 100 /*完成的请求数量*/
Failed requests: 0
Total transferred: 1515700 bytes /*整个场景中的网络传输量*/
HTML transferred: 1481400 bytes /*整个场景中的HTML内容传输量*/
Requests per second: 152.76 [#/sec] (mean) /*每秒请求数，后面括号中的 mean 表示这是一个平均值*/
Time per request: 654.628 [ms] (mean) /*每次请求的响应时间 ，后面括号中的 mean 表示这是一个平均值*/
Time per request: 6.546 [ms] (mean, across all concurrent requests) /*平均每秒网络上的流量，可以帮助排除是否存在网络流量过大导致响应时间延长的问题*/
Transfer rate: 2261.09 [Kbytes/sec] received /*网络上消耗的时间的分解，各项数据的具体算法还不是很清楚*/
Connection Times (ms)
min mean[+/-sd] median max
Connect: 3 6 1.6 7 9
Processing: 9 325 188.3 325 641
Waiting: 8 323 188.3 323 639
Total: 16 331 188.2 333 645
/*下面的内容为整个场景中所有请求的响应情况。在场景中每个请求都有一个响应时间，其中 50％ 的用户响应时间小于 333 毫秒，60 ％ 的用户响应时间小于 439 毫秒，最大的响应时间小于 645 毫秒*/
Percentage of the requests served within a certain time (ms)
50% 333
66% 439
75% 499
80% 536
90% 592
95% 620
98% 641
99% 645
100% 645 (longest request)
