The button of the Populations Group box opens the Advanced dialog.
In the Advanced dialog, you can define the following elements:
Start policy defines how the Population is started:
Immediate: the Population is started at the beginning of the test.
Delayed: the Populations starts after a preset delay.
Sequential: the Population is started once the selected Population has finished.
How Virtual Users start may also be defined: simultaneously or with a preset delay. This policy is used each time new Virtual Users are created, either at each load increase for a ramp-up load policy, at each load peak for a peak load policy, or each time a Virtual User is added manually during a test run.
Stop policy defines how the Population is stopped:
Immediate: The Virtual Users immediately stop executing their current iterations and execute their End Containers.
Delayed: The Virtual Users are allowed to finish executing their current iterations; at the end of the time limit, the Virtual Users stop their actions and execute their End Containers.
Indeterminate: The Virtual Users are left to finish their current iterations before executing their End Containers.
Information: Whatever the policy applied, the Virtual Users End Containers are always executed.