##Grad

Grad is ruby based load testing tool that replays logs to generate an exact
load behaviour patterns against target site as it is recorded in logs.

Replays logs in Apache/NCSA log format.

Name Grad is coming from:
"The BM-21 launch vehicle (Russian: БМ-21 "Град"), (Grad) a Soviet truck-mounted 122 mm multiple rocket launcher.
BM stands for boyevaya mashina, ‘combat vehicle’, and the nickname grad means ‘hail’"
(http://en.wikipedia.org/wiki/BM-21_Grad)

##Examples of usage:

Replay log file www.example.com.log against staging.example.com site

cat www.example.com.log | grad -F %combined staging.example.com

TIP: can also be used varnishncsa or similar tool

If you want to be more specific with logs format

cat www.example.com.log | grad -F "%h %l %u %t \"%r\" %>s %b \"%{Referer}i\" \"%{User-agent}i\" %w" staging.example.com

Or if you want to replay against single server, port 8080, setting host header to 'www.example.com'

cat www.example.com.log | grad -H www.example.com server1:8080

If you want to skip deplays between log entries and replay logs as fast as possible

cat www.example.com.log | grad -s staging.example.com

TIP: you may want to use --skip with --limit option

For all help use -h|--help option.