To begin, download the testing plan from the Magento performance toolkit repository.
The following is best only used on a Magento install without sample data.
With the Magento site configured for benchmarking, continue by installing the JMeter on another computer that will be used to generate the test load.
JMeter is available on any operating system that supports Java Runtime Environment.
It is important to be able to test and measure the actual capabilities of the servers hosting your application.
The best way to gauge the performance is to run a benchmark, a series of simulated operations with comparable results across the providers.