[arch-general] Multi-threaded mkinitpcio

[Lone_Wolf]

On 06-04-2020 11:47, Ralph Corderoy wrote:
> Hi Giancarlo,
>
>> Of course lzop will be faster than xz, but mkinitcpio's default is gz,
>> which should be comparable, at least in speed, with lzop.
> A slap-dash test.
>
>      $ perf stat -e instructions gzip <initramfs-linux-lts-fallback >/dev/null
>       Performance counter stats for 'gzip':
> 	19,533,249,541      instructions:u
> 	  19.642066695 seconds time elapsed
> 	  19.540737000 seconds user
> 	   0.100003000 seconds sys
>      $ perf stat -e instructions lzop <initramfs-linux-lts-fallback >/dev/null
>       Performance counter stats for 'lzop':
> 	 1,233,520,108      instructions:u
> 	   1.129177816 seconds time elapsed
> 	   1.092271000 seconds user
> 	   0.036743000 seconds sys
>      $
>
> gzip is about twenty times slower.
>
>      1,233,520,108 / 19,533,249,541 = 0.0631497644777874596
>        1.129177816 / 19.642066695   = 0.05748772944994829119
>
> Yes, my computer is probably slower than most, but then perhaps so is
> the OP's.
>

Those outputs appear to be from unpacking initramfs.

I do think OP and Giancarlo were talking about creating an initramfs .

LW