For Amazon Images you specify in your LoadComplete project, you select the instance type (for detailed information on instance types and their specifications, see the Amazon EC2 Documentation).
The instance type you select depends on your testing tasks, on the environment in which you want to simulate virtual users and on the number of virtual users you will simulate on the instance.
When selecting the instance type in the Amazon Image editor, consider the following:
The more virtual users are to be simulated on each cloud computer, the higher the CPU capacity of cloud computers should be.
Note: The maximum number of virtual users you can simulate on a single cloud computer is specified by the Max VU number property you set in LoadComplete for your machine image. It cannot exceed 2000.
The more data selectors and parameters you have in your load tests, the higher the CPU capacity of cloud computers should be.
The larger the request size of the recorded traffic in your test, the higher the RAM capacity should be on cloud computers.
We recommend that you use instances of the large type (c3.xlarge) selected in the Amazon Image editor by default.
To check whether the performance of the selected instance type is sufficient for your load testing, connect to the instance and monitor its CPU, memory and network usage during the load test run.