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cat /proc/sys/kernel/random/uuid [I ❤️ Linux] (feddit.org)
submitted 1 day ago* (last edited 14 hours ago) by A_norny_mousse@feddit.org to c/linux@programming.dev
33 comments fedilink hide all child comments

That's all. I just found this in a random script. Generates a random UUID every time it's called. I didn't know.

Of course I can also use uuidgen or pipe /dev/(u)random into something to get a random alphanumeric string - but this is built right into the kernel!

In /proc/sys/kernel/random/, there's also boot_id which ~~seems to do the same~~ is static, and some tweakable parameters.

❤️🐧

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[-] victorz@lemmy.world 8 points 1 day ago* (last edited 16 hours ago) 
cat /proc/sys/kernel/random/uuid > /dev/null
[-] Hamartiogonic@sopuli.xyz 1 points 1 day ago

That reminds me of the CPU stress test I ran many years ago.

dd if=/dev/random of=/dev/null

If you have 8 cores, just open 8 terminals, and run that code in each of them.

[-] victorz@lemmy.world 1 points 16 hours ago

Can you guarantee that each process will run on its own core?

[-] Hamartiogonic@sopuli.xyz 2 points 15 hours ago

Absolutely not, quite the opposite actually. However, the end result is close to 100% CPU load, which is good enough for some purposes. Let’s say you want to test the performance of your CPU cooler, or overclock stability, this should good enough. There are also dedicated tools for people with more advanced needs.

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this post was submitted on 24 May 2025
111 points (97.4% liked)

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