What is the function that describes the relation between CPU utilization and consumption of energy (electricity/heat wise).
I wonder if it's linear/sub-linear/exp etc..
I am writing a program that decreases the CPU utilization/load of other programs and my main concern is how much do I benefit energy wise..
Moreover, my server is mostly being used as a web-server or DB in a data-center (headless).
In case the data center need more power for cooling I need to consider that as well.. I also need to know what is the effect of CPU utilization on the entire machine power consumption ..
Here you can find a short ppt answering your questions, and providing additional info.
Although there is no Copyright notice in the ppt, the work is probably protected, so I will copy here only three graphs relevant to your main question and follow-ups in comments.
HTH!
For the CPU alone linear would be the most likely.
It gets complicated with CPUs that can reduce the clock speed under low load (like laptops) but for a server it's probably a good approximation.
Remember though that the CPU isn't the only component - you have to multiply by the percentage of power the CPU is using compared to the entire system.
来源：https://stackoverflow.com/questions/6128960/what-is-the-relation-between-cpu-utilization-and-energy-consumption