Linux

7481 readers

257 users here now

A community for everything relating to the GNU/Linux operating system

Also check out:

Original icon base courtesy of [email protected] and The GIMP

founded 2 years ago

MODERATORS

[email protected]

117

cat /proc/sys/kernel/random/uuid [I ❤️ Linux] (feddit.org)

submitted 1 week ago* (last edited 1 week ago) by [email protected] to c/[email protected]

35 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

[–] [email protected] 1 points 1 week ago (3 children)

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.

[–] [email protected] 4 points 1 week ago

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

[–] [email protected] 3 points 1 week ago* (last edited 1 week ago) (1 children)

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

[–] [email protected] 1 points 1 week ago (1 children)

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

[–] [email protected] 1 points 1 week ago

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

[–] [email protected] 2 points 1 week ago (1 children)

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

[–] [email protected] 2 points 1 week 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.