David Christensen writes:
On 2/11/24 02:26, Linux-Fan wrote:I wrote a program to automatically generate random bytes in multiple threads: https://masysma.net/32/big4.xhtml Before knowing about `fio` this way my way to benchmark SSDs :) Example: | $ big4 -b /dev/null 100 GiB | Ma_Sys.ma Big 4.0.2, Copyright (c) 2014, 2019, 2020 Ma_Sys.ma. | For further info send an e-mail to Ma_Sys.ma@web.de.
[...]
| 99.97% +8426 MiB 7813 MiB/s 102368/102400 MiB | Wrote 102400 MiB in 13 s @ 7812.023 MiB/sWhat algorithm did you implement?
I copied the algorithm from here: https://www.javamex.com/tutorials/random_numbers/numerical_recipes.shtmlI found it during the development of another application where I needed a lot of random data for simulation purposes :)
My implementation code is here: https://github.com/m7a/bo-big/blob/master/latest/Big4.java If I were to do it again today, I'd probably switch to any of these PRNGS: * https://burtleburtle.net/bob/rand/smallprng.html * https://www.pcg-random.org/
Secure Random can be obtained from OpenSSL:| $ time for i in `seq 1 100`; do openssl rand -out /dev/null $((1024 * 1024 * 1024)); done| | real 0m49.288s | user 0m44.710s | sys 0m4.579sEffectively 2078 MiB/s (quite OK for single-threaded operation). It is not designed to generate large amounts of random data as the size is limited by integer range...Thank you for posting the openssl(1) incantation.
You're welcome. [...] HTH Linux-Fan öö
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