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Re: 02/02: image: Disable compression for ISO images.
From: |
Mathieu Othacehe |
Subject: |
Re: 02/02: image: Disable compression for ISO images. |
Date: |
Mon, 27 Apr 2020 18:00:05 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/26.3 (gnu/linux) |
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.
Thanks,
Mathieu