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You underestimate how much Google tries to squeeze out of all the machines in its fleet. That includes old ones, sometimes to comical effect. A colleague at my current job told me about utilization targets at Amazon, where he used to work. At Google you could choose to be that wasteful if you really wanted to, but you'd lose headcount. Be more efficient and you'd get more engineers. I.e. you decide if you'd rather get machines or people.

There's also an old paper by Murray Stokely and co. about the fake market that was created to make the most use of all hardware planetwide.

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