ab(1) -k -c 25 -n 1000 -S
Apache HTTP server benchmarking tool
-k     Enable  the  HTTP  KeepAlive  feature,  i.e.,  perform  multiple requests within one HTTP session.
       Default is no KeepAlive.
-c concurrency
       Number of multiple requests to perform at a time. Default is one request at a time.
-n requests
       Number of requests to perform for the benchmarking session. The  default  is  to  just  perform  a
       single request which usually leads to non-representative benchmarking results.
-S     Do  not  display  the median and standard deviation values, nor display the warning/error messages
       when the average and median are more than one or two  times  the  standard  deviation  apart.  And
       default to the min/avg/max values. (legacy support).
source manpages: ab