JMeter Arrivals Thread Group element is specially created for the case where no. of orders to be submitted in an hour; is known. In such type of scenarios, more preference is given to the quantity of order irrespective no. of users. Apache JMeter adjust the number of threads according to the target arrival rate.
“Arrivals Rate” word is used for the rate of iteration (order submission). If I say 10 licenses are purchased in a minute which signifies that 10 iterations need to be started and completed in 1 minute. Hence the arrival rate will be 10/min. If I say 1000 movie tickets booking in an hour (16.6 = ~17/min), then it signifies that around 17 iterations should be started and completed in 1 minute, so arrival rate will be 17.
Target Rate = 120 Arrivals / min
Ramp-up Time: 1min
Step-Count: 10
Hold: 2min
Total Arrivals = Arrivals between 0-30 Sec + Arrivals between 30-60 Sec + Arrivals between 60-180Sec
0-30 Sec = 30 Arrivals
30-60 Sec = 60 based on (120 * 30/60)
60-180 = 120*2 = 240
Total Arrivals = 30+60+240 = 330 Arrivals/Min