The Random load profile simulates the randomly varying number of virtual users (VUs load type) or arriving virtual users (Rate load type).

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Depeneding on a load type, the Random profile has different options. See the table below to learn more:

Load Type	Option	Description
VUs	Base VUs	The mean number of users simulated during the test.
	Random factor	The difference between the minimum and maximum numbers of simulated users in percentage of Base VUs, rounded up.
	Distribution	The type of distribution.
	Wait time	The time to wait before restarting a virtual user.
Rate	Base arriving users	The mean number of users starting the test per unit of time during the test.
	Random factor	The difference between the minimum and maximum numbers of users starting the test per unit of time during the test.
	Distribution	The type of distribution.

To use this load profile, you need a ReadyAPI Performance license. If you do not have it, you can request it on our web site or start a trial.

When using the Random profile, you can choose what type of random distribution will be simulated:

Select the Uniform distribution to keep the average number of users to the specified value across the test.
Select the Exponential distribution to mainly simulate a low load across the test with some points of high load.
Select the Gaussian distribution to mainly simulate an average load across the test with a bit of high and low load.

Random Factor determines the maximum difference between the minimum and maximum loads. For example:

If you have 10 simulated virtual users and 100% Random Factor, the spread will be 10 virtual users, so the minimum load will be 5, and the maximum load – 15.
If you set Random Factor to 200%, the minimum load will always be 0 virtual users.
If Random Factor is above 200%, the random value may be negative. In this case, 0 virtual users will be simulated.

Random Profile