If, say, it was 2 seconds, total time taken to complete 5 transactions would still be 5*15 = 75 seconds i.e. In both the above examples, we also assumed that think time was set to Zero. In the second example, as long as the average response times are less than 15 seconds, it will always take 75 seconds to complete 5 iterations i.e. Thence it will take 5*15 = 75 seconds to complete 5 iterations. But the fact that now pacing is greater than response times, it will override the response times and it will control the transaction rate. Here, you can see that TPS is controlled by response time.Įxample2: Let’s say that we have set pacing to 15 sec and Think Time to zero.Ī vuser performs 5 transactions and response time for each transaction is 10 seconds. Then it will take 5*10 = 50 seconds to complete 5 transactions. See the screenshot below.Įxample1: Let’s say that we have set Pacing to zero and Think Time to zero.Ī vuser performs 5 transactions and response time for each transaction is 10 seconds. The first two options are less reliable because the response times fluctuate under load and thus affecting the TPS. That is just because the action contains only one transaction. Thus one transaction will be fired when one iteration of the action is completed.Īlso, to simulate correct TPS, always use the FIXED pacing option available in Run-time settings of Loadrunner. In following examples, you may find that the terms ‘transaction’ and ‘iteration’ are used interchangeably. In the examples below, let’s assume that the vuser’s action() contains only one transaction. Remember, Pacing always overrides Response time when it comes to determining TPS And hence it also helps to control the rate of iterations i.e. it is the pause a vuser takes before executing next iteration. i.e.īefore going into details of the formula derived by little’s law, it is important to understand how response time and pacing are related because these are the key factors that control your TPS if the number of vusers is kept constant.Īs we know pacing is inter-iteration gap i.e.
It also tells us that if the vuser is able to complete 6 transactions in 60 seconds that means response time for each transaction is 10 sec. There’s an important fact hidden in the above example. In other words, it can be calculated based on how many transactions are executed over a certain duration of the test and then calculate it for a second.įor example, if a vuser executes 6 transactions every minute, then the TPS would be 6 transactions/60 sec = 0.10 TPS Transaction per second (TPS) is the number of transactions executed per second.
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