ramp up设置:
test_script1......start 4 Vusers every 1 second
test_script2......start 4 Vusers every 1 second
test_script3......start 9 Vusers every 1 second
集合点设置:
test_script1......release when 4 Vusers arrive at the rendezvous
test_script2......release when 4 Vusers arrive at the rendezvous
test_script3......release when 9 Vusers arrive at the rendezvous