apt-get install apache2-utils   

sage: ab [options] [http[s]://]hostname[:port]/pathOptions 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　　

Benchmarking localhost (be patient)Completed 500 requestsCompleted 1000 requestsCompleted 1500 requestsCompleted 2000 requestsCompleted 2500 requestsCompleted 3000 requestsCompleted 3500 requestsCompleted 4000 requestsCompleted 4500 requestsCompleted 5000 requestsFinished 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:      200Time 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 bytesRequests 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   maxConnect:        0    6  73.1      0    1001Processing:     2  150 143.9    111    1626Waiting:        2  137 135.3    103    1197Total:          2  155 160.3    111    1626Percentage 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)