##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.