sudo apt-get install apache2-utils //Ubuntu举例 

root@ubuntu:~# ab -h
Usage: ab [options] [http[s]://]hostname[:port]/path
Options are:
    -n requests     Number of requests to perform   //要执行的请求数
    -c concurrency  Number of multiple requests to make at a time //并发数
    -t timelimit    Seconds to max. to spend on benchmarking //
                    This implies -n 50000
    -s timeout      Seconds to max. wait for each response //超时，默认每个response 30s
                    Default is 30 seconds
    -b windowsize   Size of TCP send/receive buffer, in bytes //TCP发送/接收缓冲区的大小，以字节为单位
    -B address      Address to bind to when making outgoing connections   //Address to bind to when making outgoing connections
    -p postfile     File containing data to POST. Remember also to set -T  //包含POST数据的文件。 
    -u putfile      File containing data to PUT. Remember also to set -T   //包含PUT的文件
    -T content-type Content-type header to use for POST/PUT data, eg.  // 文本类型
                    \'application/x-www-form-urlencoded\'
                    Default is \'text/plain\'
    -v verbosity    How much troubleshooting info to print    //日志级别
    -w              Print out results in HTML tables          //在HTML表格中打印结果
    -i              Use HEAD instead of GET                   //使用HEAD而不是GET
    -x attributes   String to insert as table attributes      //作为表属性插入的字符串
    -y attributes   String to insert as tr attributes         //作为tr属性插入的字符串
    -z attributes   String to insert as td or th attributes   //作为td或th属性插入的字符串
    -C attribute    Add cookie, eg. \'Apache=1234\'. (repeatable) //添加cookie
    -H attribute    Add Arbitrary header line, eg. \'Accept-Encoding: gzip\' //添加header
                    Inserted after all normal header lines. (repeatable)
    -A attribute    Add Basic WWW Authentication, the attributes //添加基本WWW身份验证
                    are a colon separated username and password.
    -P attribute    Add Basic Proxy Authentication, the attributes // 添加基本代理验证
                    are a colon separated username and password.
    -X proxy:port   Proxyserver and port number to use // 要使用的Proxyserver和端口号
    -V              Print version number and exit //版本号
    -k              Use HTTP KeepAlive feature //使用长连接
    -d              Do not show percentiles served table. // 不展示百分比
    -S              Do not show confidence estimators and warnings. //不展示警告
    -q              Do not show progress when doing more than 150 requests  //执行超过150个请求时不要显示进度
    -l              Accept variable document length (use this for dynamic pages) //接受可变文档长度（用于动态页面）
    -g filename     Output collected data to gnuplot format file. //将收集的数据输出到gnuplot格式文件
    -e filename     Output CSV file with percentages served //输出已提供百分比的CSV文件
    -r              Don\'t exit on socket receive errors.
    -m method       Method name // 方法名称
    -h              Display usage information (this message) //显示使用信息
    -Z ciphersuite  Specify SSL/TLS cipher suite (See openssl ciphers)
    -f protocol     Specify SSL/TLS protocol
                    (TLS1, TLS1.1, TLS1.2 or ALL)