We all know in performance testing we have Vusers concepts
but do Vuser and Real Users are same and do we have a one to one relationship
between real and virtual users always. No that’s not the case. It depends on
what is being tested and how we have script/design the scenario. We can design
the scenario in such a way so that we can represent multiple real users by
single vuser.
To determine the ratio, we need to have a good understanding
of Performance goal and Application usage pattern. Little law's can be used to
estimate number of vusers
Little law is represented by below formula
L= λW
Where W=Average Response Time + Think Time and λ is the
arrival rate.
So, considering there is an eCommerce application where user
arrives at the rate of 10 users per seconds and we have target average response
time is 5 Seconds. In this case number of vusers we would be simulating is
10*3=50
Above concepts helps in designs scenario where we have a Vuser # restriction
for tool license. Using the above approach we can simulate the load for higher
number of user by manipulating the think time.
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