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this post was submitted on 16 Feb 2024
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Is there a perfect scheduler that is non-optimal in the Big(O) sense but is optimal if you're looking at maximizing hardware utilization? In other words, scheduler that takes a long time to determine CPU utilization for each process, but provides an optimal total CPU utilization? I realize that it would not be ideal since we'd essentially have these "sudden stops" as it recalculates the schedule. I'm just more interested in the theory.
If you have a fixed collection of processes to run on a single processor and unlimited time to schedule them in, you can always brute force all permutations of the processes and then pick whichever permutation maximizes and/or minimizes whatever property you like. The problem with this approach is that it has awful time complexity.
Edit: There's probably other subtle issues that can arise, like I/O interrupts and other weird events fwiw.
How would you deal with iowaits in a system like that? I can perfectly burn 100% of CPU time running a poll(), but that’s not useful work…
¯\_(ツ)_/¯
I guess that's why I asked. I'm just curious if it's even possible.