: On 19 July 2017 at 21:19, Steven D'Aprano <steve at pearwood.info> wrote: > But the premise is wrong too. Those hypothetical people don't turn their > Macs on in sequence, each person turning their computer on only after > the previous person's Mac had finished booting. They effectively boot > them up in parallel but offset, spread out over a 24 hour period, so > about 3472 people booting up at the same time each minute of the day. > Time savings for parallel processes don't add in the way Jobs adds them, > if we treat this as 1440 parallel processes (one per minute of the day) > we save 1440 hours a year. Ah, but the relevant unit here is person-hours, not hours: Jobs is claiming that *each* Mac user loses X% of *their* life to boot times, and then adds all those slices of life together into N lifetimes (which again, are counted in person-years, not years). It's still wrong, though: longer boot times actually increase the proportion of your life spent in meaningful activity (e.g. going to the canteen and talking to someone). -[]z.
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