Re: 02/02: image: Disable compression for ISO images.

[Mathieu Othacehe <m.othacehe@gmail.com>]

Hey Tobias,

> guix-commits@gnu.org 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