How to Calculate pacing in Loadrunner ?
Just suppose that you have to achieve “50 transactions per second in avg. response 0.5 sec for
100 users in 1 hour” as goal of load test,
so how much pacing or think time we should give in our script.
1 hour= 3600 sec
Expected Total Transactions = 50*3600=180000 trns/hour by 100 Users
Each user will perform 180000/100=1800 transactions per hour
1 transaction is taking avg 0.5 sec so 1800 transaction will take = (1800*0.5)/60=15min
Now think time will for this run will be =60-15= 45 min =2700 sec
1800 transactions in 2700 sec so one transaction will take = 1.5 sec (this think time we need to include)
Total time to complete one iteration = 0.5+1.5=2 sec (avg)
Lets cross check our calculation:
1800 transaction * 2 sec= 1 hour (Achieved)
----------------------------------------------------------------------------------------------------------------
Pacing Calculation :
D = Duration of the test(test window/time frame)
B = Baseline time(total time taken by 1 Vu to complete 1 whole iteration)
T = Total amount of Think time in the script
I = Expected/Target iteration
R = Residual time of the test window.
R = ( D - (T + B)*I)
P = Pacing interval
Dividing the residual time by target iteration gives pacing interval
Hence:
P = R/I
D is pacing time.
(T + B)*I represents the duration of a scenario
and P is the waiting time before the next scenario
Pacing Calculation for your reference
SLA defined/Data supplied by business team :
a. Number of users = n
b. Transactions/hour = t
Calculate Transactions/hour/number of users(k)=t/n
Pacing required (p)= 3600/k
Here pacing should be variable between (p+0.1p) to (p-0.1)p
For example :
a. Number of users=20
b. Transactions/hour=80
Transactions/hour/number of users k=80/20=4
Pacing P=3600/4=900
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