ubuntu下 使用AB做压力测试

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
    -s timeout      Seconds to max. wait for each response
                    Default is  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  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., TLS1. 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  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Completed  requests
Finished  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:         bytes       

Concurrency Level:
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: , Receive: , Length: , Exceptions: )
Total transferred:       bytes         //总共传输字节
HTML transferred:        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:              73.1
Processing:        143.9
Waiting:           135.3
Total:             160.3        

Percentage of the requests served within a certain time (ms)
  %
  %
  %
  %
  %
  %
  %
  %
 %    (longest request)