1最近刚开始接触apache大数据下数据优化，讲一下apache 下ab压力测试工具。
程序“ab”尚未安装。 您可以使用以下命令安装：
apt-get install apache2-utils
以下是ab --help
sage: 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 -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. -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)
-n ：总共的请求执行数，缺省是1； -c： 并发数，缺省是1； -t：测试所进行的总时间，秒为单位，缺省50000s -p：POST时的数据文件 -w: 以HTML表的格式输出结果
以下为执行 ab -n 5000 -c 200 http://localhost/test.php 的结果：
Benchmarking localhost (be patient) Completed 500 requests Completed 1000 requests Completed 1500 requests Completed 2000 requests Completed 2500 requests Completed 3000 requests Completed 3500 requests Completed 4000 requests Completed 4500 requests Completed 5000 requests Finished 5000 requests //执行完的请求次数
Server Software: Apache/2.4.3 //apache版本 Server Hostname: localhost //主机 Server Port: 80 //端口 Document Path: /test.php //路径 Document Length: 62492 bytes Concurrency Level: 200 Time taken for tests: 3.927 seconds //完成此次请求时间 Complete requests: 5000 //完成请求次数 Failed requests: 527 //失败的请求次数 (Connect: 0, Receive: 0, Length: 527, Exceptions: 0) Total transferred: 313289422 bytes //总共传输字节 HTML transferred: 312459422 bytes Requests per second: 1273.33 [#/sec] (mean) //每秒请求次数 Time per request: 157.069 [ms] (mean) //一次请求时间 Time per request: 0.785 [ms] (mean, across all concurrent requests) Transfer rate: 77914.14 [Kbytes/sec] received //传输速率 Connection Times (ms) min mean[+/-sd] median max Connect: 0 6 73.1 0 1001 Processing: 2 150 143.9 111 1626 Waiting: 2 137 135.3 103 1197 Total: 2 155 160.3 111 1626 Percentage of the requests served within a certain time (ms) 50% 111 66% 141 75% 168 80% 191 90% 310 95% 452 98% 673 99% 951 100% 1626 (longest request)