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Instant boot Linux? (lemmy.world)

submitted 18 hours ago by Fmstrat@lemmy.world to c/linux@programming.dev

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Hi all,

Is there a method out there that can "save a hibernate state" to disk, and just permanently boot immediately into that state every time?

It would be OK to lose data used after this point. And ot would also be OK if it required building a custom image based on the hardware, similar to embedded systems.

The goal is to be able to, as quickly as possible, spin up a GPU server when needed, but without using suspend/resume.

Thanks.

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[–] HelloRoot@lemy.lol 1 points 12 hours ago* (last edited 12 hours ago) (1 children)

For my two systems (pc and laptop)with 32GB RAM each it takes ~4 minutes to boot from hibernation.

Which is expexted afaik.

Thats the opposite of "instant".

[–] khleedril@cyberplace.social 3 points 12 hours ago (1 children)

@HelloRoot @Die4Ever There is something wrong with your setup.

[–] HelloRoot@lemy.lol 1 points 12 hours ago* (last edited 12 hours ago) (2 children)

No not really.

It's how long it takes to read 32GB from my swap. 170 MB/s continuous read speed ≈ 188 sec (3 min 8 sec) add the normal boot time to it (bios, grub, kernel initramfs) and you get the 4 minutes.

When the system boots cold it doesn't have to read 32GB, just 0.5-2GB maybe.

[–] Fmstrat@lemmy.world 2 points 7 hours ago (1 children)

If you are writing the full 32GB, something is wrong. Shared memory isn't written twice.

[–] HelloRoot@lemy.lol 1 points 1 hour ago

You might be right. But I still have no clue how to properly set it up.

[–] Sims@lemmy.ml 3 points 11 hours ago (1 children)

Just for the record, Linux can do with less swap-space than the memory you have, also for hibernation. The system doesn't write every byte to swap, and it uses compression. With 32gb I would choose a default swapsize of ~10gb max, but test it first as it depends on the specific content of your ram, and usage patterns oc. However, its an instant time-saver during boot.

[–] HelloRoot@lemy.lol 1 points 10 hours ago

Didn't work for me, it would cancel the hibernation saying there is not enough space in swap.

Do you have a guide for that?