117
cat /proc/sys/kernel/random/uuid [I ❤️ Linux] (feddit.org)
submitted 10 months ago* (last edited 10 months ago) by A_norny_mousse@feddit.org to c/linux@programming.dev
36 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.

❤️🐧

you are viewing a single comment's thread
view the rest of the comments
[-] Hamartiogonic@sopuli.xyz 1 points 10 months 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.

[-] YerbaYerba@lemm.ee 4 points 10 months ago

/dev/urandom should stress the CPU more. /dev/random can be entropy limited

[-] lime@feddit.nu 3 points 10 months ago* (last edited 10 months ago) 
for i in {1..n}  # where n == number of cores
do
  dd if=/dev/urandom of=/dev/null &
done

# to stop:
jobs -p | xargs kill
[-] Hamartiogonic@sopuli.xyz 1 points 10 months ago

Oh yeah. This looks like a much better way to do it. My solution is pretty bare bones by comparison.

[-] lime@feddit.nu 1 points 10 months ago

the advantage of yours is that you can actually see the performance number afterwards.

[-] victorz@lemmy.world 2 points 10 months ago

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

[-] Hamartiogonic@sopuli.xyz 2 points 10 months 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.

this post was submitted on 24 May 2025
117 points (97.6% liked)

Linux

13277 readers
393 users here now

A community for everything relating to the GNU/Linux operating system (except the memes!)

Also, check out:

Original icon base courtesy of lewing@isc.tamu.edu and The GIMP

founded 2 years ago
MODERATORS
Ategon@programming.dev
anzo@programming.dev
dwraf_of_ignorance@programming.dev