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this post was submitted on 10 Aug 2025
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I love that people get upset that their CPU is using its resources when they're using it.
Reminds me of how some people get upset when their OS uses up all their RAM, no matter how much they have. It's like they want their PC to be sluggish and unresponsive. Unused RAM is wasted RAM.
Did a project several years where the customrr required that the server we delivered specifically for the project never use more than 50% CPU or RAM. No requirements about how fast it actually performs its intended function, just that it can only utilise half the available resources while doing it.
Probably a bleed-over from the embedded side. Spent a lot of years working embedded control systems for NASA and DoD - bare metal systems, often interrupt driven - and it was common to have 50% margin requirements. They know those systems will grow over time, and they often have lifespans measured in decades.
That would make sense, i hadn't put that together but they had a lot of embedded control systems. This was water treatment but entirely separate from the control systems but i can see them having that a standard requirement
So was it a government (state or federal) water treatment plant? If so, I can tell you how it happened. The government contracting agencies have boilerplate text they're supposed to add to contracts to make sure salient requirements get flowed. They're supposed to delete or tailor anything that doesn't make sense, but the contracts people aren't usually very technical. We had requirements flowed to us about password management and account monitoring, but no one logs into a rocket engine or a torpedo. When we'd point it out, they'd say "oops, we should have deleted that."
My software does that anyway because I can't be arsed with multithreading or a 64 bit version