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Comment by cool_hw | Hacker News Reader

Your read/writes seem to be comparable to the parent, but your power on hours are significantly lower, really hard to draw any conclusions here.

I wonder if this whole issue is simply MacOS dumping the stuff in memory to disk when going to standby, and then reading it all back.

So for a 16GB machine, for simplicity, let's say you always have RAM saturated, and you open/close the lid 5 times in a day, you have 16GB * 5 = 80GB per day read/written. For 365 days, that is 80 * 365 = 29200 GB or 28.51 TB read/written.

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Launch day purchased M1 MacBook Pro with 4TB SSD.

I have custom pmset setup to NOT dump to disk (mostly) with two aliases:

    pmset-fast: sudo pmset -ab hibernatemode 0 sleep 0
    pmset-secure: sudo pmset -ab hibernatemode 25 sleep 0 displaysleep 1

First one is memory only, if the battery dies, the battery dies and the OS goes away.

The second one is hard drive only, closing the lid writes to disk only and puts the laptop into deep sleep.

I know I'm weird for having this but since I run the first one (fast) 99% of the time I can basically say I almost never write hibernation files to disk.

Thank you, this is useful. I think I'm going to try the memory only option. Your Read/Writes seem lower than others (still pretty high, but much better than other Apple Silicon)

Is there a noticeable difference in battery life usage with option 1?

>open/close the lid 5 times in a day

It's a bit smarter than that, it only writes memory contents to disk after a given period in standby. So in your example you'd only be incurring it twice a day probably.

Indeed, I intended to say letting it get to standby. :)

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