Usage: ab [options] [http[s]://]hostname[:port]/path 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 -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. -h Display usage information (this message) -Z ciphersuite Specify SSL/TLS cipher suite (See openssl ciphers) -f protocol Specify SSL/TLS protocol (SSL3, TLS1, TLS1.1, TLS1.2 or ALL)
// 处理 10000 个请求并每次同时运行 10 次请求 # ab -n 10000 -c 10 http://127.0.0.1:9999/getDemo This is ApacheBench, Version 2.3 <$Revision: 1430300 $> Copyright 1996 Adam Twiss, Zeus Technology Ltd, http://www.zeustech.net/ Licensed to The Apache Software Foundation, http://www.apache.org/
Server Software: fasthttp Server Hostname: 127.0.0.1 Server Port: 9999
Document Path: /getDemo Document Length: 17 bytes
Concurrency Level: 10 Time taken for tests: 0.409 seconds Complete requests: 10000 Failed requests: 0 Write errors: 0 Total transferred: 1620000 bytes HTML transferred: 170000 bytes Requests per second: 24424.38 [#/sec] (mean) Time per request: 0.409 [ms] (mean) Time per request: 0.041 [ms] (mean, across all concurrent requests) Transfer rate: 3864.01 [Kbytes/sec] received
Connection Times (ms) min mean[+/-sd] median max Connect: 0 0 0.0 0 0 Processing: 0 0 0.0 0 1 Waiting: 0 0 0.0 0 1 Total: 0 0 0.0 0 1
Percentage of the requests served within a certain time (ms) 50% 0 66% 0 75% 0 80% 0 90% 0 95% 0 98% 1 99% 1 100% 1 (longest request)
Total transferred表示所有请求的响应数据长度总和，包括每个HTTP响应数据的头信息和正文数据的长度。注意这里不包括HTTP请求数据的长度，仅仅为web服务器流向用户PC的应用层数据总长度。
HTML transferred表示所有请求的响应数据中正文数据的总和，也就是减去了Total transferred中HTTP响应数据中的头信息的长度。
Requests per second吞吐率，也叫QPS，计算公式：Complete requests/Time taken for tests
Time per request用户平均请求等待时间，从用户角度看，完成一个请求所需要的时间。计算公式：Time token for tests/（Complete requests/Concurrency Level）。
**Time per requet(across all concurrent request)**服务器完成一个请求的时间，计算公式：Time taken for tests/Complete requests，正好是吞吐率的倒数。 也可以这么统计：Time per request/Concurrency Level。
Transfer rate表示网络传输速度，计算公式：Total trnasferred/ Time taken for tests，这个统计很好的说明服务器的处理能力达到极限时，其出口宽带的需求量。
Percentage of requests served within a certain time（ms） 这部分数据用于描述每个请求处理时间的分布情况，比如以上测试，80%的请求处理时间都不超过2ms，这个处理时间是指前面的Time per request，即对于单个用户而言，平均每个请求的处理时间。