* Re: 02/02: image: Disable compression for ISO images.
[not found] ` <20200427140926.3B6CF20B7A@vcs0.savannah.gnu.org>
@ 2020-04-27 15:13 ` Tobias Geerinckx-Rice
2020-04-27 16:00 ` Mathieu Othacehe
0 siblings, 1 reply; 3+ messages in thread
From: Tobias Geerinckx-Rice @ 2020-04-27 15:13 UTC (permalink / raw)
To: Mathieu Othacehe; +Cc: Guix-devel
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Mathieu,
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?
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.
Kind regards,
T G-R
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^ permalink raw reply [flat|nested] 3+ messages in thread* Re: 02/02: image: Disable compression for ISO images.
2020-04-27 15:13 ` 02/02: image: Disable compression for ISO images Tobias Geerinckx-Rice
@ 2020-04-27 16:00 ` Mathieu Othacehe
2020-04-28 9:37 ` Bengt Richter
0 siblings, 1 reply; 3+ messages in thread
From: Mathieu Othacehe @ 2020-04-27 16:00 UTC (permalink / raw)
To: Tobias Geerinckx-Rice; +Cc: Guix-devel
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
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: 02/02: image: Disable compression for ISO images.
2020-04-27 16:00 ` Mathieu Othacehe
@ 2020-04-28 9:37 ` Bengt Richter
0 siblings, 0 replies; 3+ messages in thread
From: Bengt Richter @ 2020-04-28 9:37 UTC (permalink / raw)
To: Mathieu Othacehe; +Cc: Guix-devel
On +2020-04-27 18:00:05 +0200, Mathieu Othacehe wrote:
>
> 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.
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
^ permalink raw reply [flat|nested] 3+ messages in thread
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[not found] ` <20200427140926.3B6CF20B7A@vcs0.savannah.gnu.org>
2020-04-27 15:13 ` 02/02: image: Disable compression for ISO images Tobias Geerinckx-Rice
2020-04-27 16:00 ` Mathieu Othacehe
2020-04-28 9:37 ` Bengt Richter
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