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Spent a few years doing population projections for regional planning and the thing that always got lost was how sensitive the long run numbers are to small fertility and migration assumptions.

Biggest thing for me was pinning CPU governor to performance and disabling turbo entirely. Slower numbers but they stop drifting as the box heats up. Also isolcpus for the load generator, otherwise you're benchmarking your own noise.

My grandad ran a small letterpress shop and when phototypesetting came in he didn't retrain, he just did smaller and smaller jobs until it was wedding invitations.