[arch-projects] [mkinitcpio] boot times with different COMPRESSIONs

[Tom Gundersen]

In case it is not clear: the only imortant number is the "kernel"
time. In which gzip/lzop are the clear winners.

On Mon, Aug 1, 2011 at 11:05 PM, Tom Gundersen <teg at jklm.no> wrote:
> Hi guys,
>
> We have a lot of compression options now for mkinitcpio, so I figured
> I'd try to measure which one gives us the fastest boot. I guess boot
> speed is the most important metric when deciding which one to choose.
>
> The measurements were done on an Lenovo ThinkPad x60, with an Intel
> Core 2 processor and an 5400 rpm HDD, so your milage might obviously
> vary.
>
> Here are my numbers:
>
> xz
> Startup finished in 710ms (kernel) + 2526ms (initrd) + 14335ms
> (userspace) = 17572ms
> Startup finished in 610ms (kernel) + 2448ms (initrd) + 48159ms
> (userspace) = 51218ms
> Startup finished in 710ms (kernel) + 2458ms (initrd) + 11294ms
> (userspace) = 14462ms
> Startup finished in 720ms (kernel) + 2488ms (initrd) + 12271ms
> (userspace) = 15480ms
> Startup finished in 710ms (kernel) + 2446ms (initrd) + 9602ms
> (userspace) = 12758ms
>
> gzip
> Startup finished in 560ms (kernel) + 2422ms (initrd) + 9917ms
> (userspace) = 12899ms
> Startup finished in 560ms (kernel) + 2445ms (initrd) + 9734ms
> (userspace) = 12740ms
> Startup finished in 560ms (kernel) + 2451ms (initrd) + 10544ms
> (userspace) = 13556ms
> Startup finished in 560ms (kernel) + 2427ms (initrd) + 9756ms
> (userspace) = 12744ms
> Startup finished in 570ms (kernel) + 2439ms (initrd) + 9823ms
> (userspace) = 12832ms
>
> bzip2
> Startup finished in 810ms (kernel) + 2428ms (initrd) + 9690ms
> (userspace) = 12928ms
> Startup finished in 810ms (kernel) + 2448ms (initrd) + 9635ms
> (userspace) = 12893ms
> Startup finished in 810ms (kernel) + 2504ms (initrd) + 10212ms
> (userspace) = 13526ms
> Startup finished in 810ms (kernel) + 2445ms (initrd) + 8838ms
> (userspace) = 12094ms
> Startup finished in 820ms (kernel) + 2438ms (initrd) + 9613ms
> (userspace) = 12871ms
>
> lzma
> Startup finished in 790ms (kernel) + 2441ms (initrd) + 9335ms
> (userspace) = 12567ms
> Startup finished in 790ms (kernel) + 2442ms (initrd) + 9662ms
> (userspace) = 12895ms
> Startup finished in 770ms (kernel) + 2432ms (initrd) + 10199ms
> (userspace) = 13401ms
> Startup finished in 770ms (kernel) + 2425ms (initrd) + 9922ms
> (userspace) = 13117ms
> Startup finished in 770ms (kernel) + 2435ms (initrd) + 9502ms
> (userspace) = 12708ms
>
> lzop
> Startup finished in 550ms (kernel) + 2461ms (initrd) + 10730ms
> (userspace) = 13742ms
> Startup finished in 570ms (kernel) + 2421ms (initrd) + 20680ms
> (userspace) = 23671ms
> Startup finished in 550ms (kernel) + 2435ms (initrd) + 8752ms
> (userspace) = 11738ms
> Startup finished in 570ms (kernel) + 2454ms (initrd) + 9575ms
> (userspace) = 12600ms
> Startup finished in 550ms (kernel) + 2453ms (initrd) + 8540ms
> (userspace) = 11543ms
>
> Cheers,
>
> Tom
>