Re: [PATCH] cksum: Use AVX2 and AVX512 for speedup

[Sylvestre Ledru]

Hello,

Le 25/11/2024 à 17:04, Sam Russell a écrit :
> I've added a sample benchmarking program to measure the difference without
> hitting disk, looking like a 40% speedup
>
> $ time ./cksum_bench_pclmul 1048576 10000
> Hash: EFA0B24F, length: 1048576
>
> real    0m3.018s
> user    0m3.018s
> sys     0m0.000s
>
> $ time ./cksum_bench_avx2 1048576 10000
> Hash: EFA0B24F, length: 1048576
>
> real    0m1.824s
> user    0m1.804s
> sys     0m0.020s

If I may, you might be interested in looking into 
https://github.com/sharkdp/hyperfine for benchmarking this type of change.

(it is available in Debian & Ubuntu).

As a side note, samply is amazing for performance profiling:

https://github.com/mstange/samply

Cheers,
Sylvestre