Cloud Solutions Make It Hard to Measure Energy Usage

Today I continued my exploration into measuring energy usage for a server. To my dismay I discovered that when running software within a VPS, measuring its energy usage becomes impossible. A VPS obscures the underlying hardware to protect other servers running on the same hardware. Theoretically, an attacker could use the energy data to perform side-channel attacks to extract private keys from other users, so there are good reasons to keep the data hidden in virtualized systems.

All the companies that I have worked for rely on VPSes and VMs, with no access to the underlying hardware. I imagine at this point it is pretty standard in the industry, which makes me think that few companies are able to measure their energy usage and understand the footprint of their backend.

It is unfortunate because sharing the hardware also means that we could leverage it more efficiently, and avoid over-provisioning hardware. At the same time, when you do not understand how much energy the software is using, it encourages wastefulness.