I need to run some stresstests on a new long polling technology we're using. To know what the capabilities are, I'd like to run 2 (or maybe more) tests on a VM.
First I'd like to start with for example a CPU of 1 GHz. The second test would be with 2 GHz. When we know the limits (number of concurrent clients) of 1 Ghz and 2 Ghz, we can see how it scales on the hardware (is it lineair with the CPU etc.).
Is it possible to increase/decrease the CPU frequency of a VM in a fast/easy way without physically changing the hardware? I think this should be possible, because many VPS providers allow their clients to dynamically scale their VPS.