siege -b -c=10 -t=5m http://...
-c, --concurrent=N
-t, --time=MINSm
-r, --reps=N
-i, --internet Hit URLs randomly
-b, --benchmark No delay between requests
Configuration
-f, --file=FILE load urls.txt
-R, --rc=FILE load siegerc
Also see: siegerc
Headers
-H, --header="Cookie: foo=bar"
-A, --user-agent="Mozilla"
-T, --content-type="text/html"