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Re: 02/02: image: Disable compression for ISO images.
From: |
Bengt Richter |
Subject: |
Re: 02/02: image: Disable compression for ISO images. |
Date: |
Tue, 28 Apr 2020 11:37:37 +0200 |
User-agent: |
Mutt/1.10.1 (2018-07-13) |
On +2020-04-27 18:00:05 +0200, Mathieu Othacehe wrote:
>
> Hey Tobias,
>
> > address@hidden 写道:
> >> + ;; XXX: Temporarily disable compression to speed-up the tests.
> >> + (compression? #f)))
> >
> > Interesting! What kind of improvement do you see, roughly?
>
> I posted some figures here:
> https://lists.gnu.org/archive/html/guix-devel/2020-04/msg00374.html.
>
> Here's a more complete summary:
>
> --8<---------------cut here---------------start------------->8---
> | | Host (wip-disk-image) | VM (master) |
> |----------------+-----------------------+-------------|
> | No compression | 4min | 12min |
> | Compression | 8min | 19min |
> --8<---------------cut here---------------end--------------->8---
>
> > When I added zlib compression I was surprised to learn that here it made no
> > significant difference in wall clock time (less than a minute; 5% or so) or
> > CPU time. The disks they spin and CPU she is fast, but still I would have
> > noticed a spike.
>
> Strange we have different results, those benches are not very accurate
> though.
Might it throw some light to see your different results for
--8<---------------cut here---------------start------------->8---
$ lscpu|grep -i bogo
$ top -n1|grep ^MiB
--8<---------------cut here---------------end--------------->8---
At least I'm curious :)
>
> Thanks,
>
> Mathieu
>
--
Regards,
Bengt Richter