NAME
       ab - Apache HTTP server benchmarking tool

SYNOPSIS
       ab [ -A auth-username:password ] [ -c concurrency ] [ -C cookie-name=value ] [ -d ] [ -e csv-file ] [ -g
       gnuplot-file ] [ -h ] [ -H custom-header ] [ -i ] [ -k ] [ -n requests ] [ -p POST-file ]  [  -P  proxy-
       auth-username:password  ] [ -q ] [ -s ] [ -S ] [ -t timelimit ] [ -T content-type ] [ -v verbosity] [ -V
       ] [ -w ] [ -x <table>-attributes ] [ -X proxy[:port] ] [ -y <tr>-attributes ]  [  -z  <td>-attributes  ]
       [http://]hostname[:port]/path

SUMMARY
       ab  is  a tool for benchmarking your Apache Hypertext Transfer Protocol (HTTP) server. It is designed to
       give you an impression of how your current Apache installation performs. This especially shows  you  how
       many requests per second your Apache installation is capable of serving.

http://bashconsole.org/man.1.ab.html