From: "Ludovic Courtès" <ludo@gnu.org>
To: guix-devel@gnu.org, Tobias Geerinckx-Rice <me@tobias.gr>
Subject: Compressed ISO image got bigger
Date: Mon, 13 Apr 2020 16:42:39 +0200 [thread overview]
Message-ID: <874ktnih0g.fsf@gnu.org> (raw)
In-Reply-To: <878sj1qcw7.fsf@gnu.org> ("Ludovic \=\?utf-8\?Q\?Court\=C3\=A8s\=22'\?\= \=\?utf-8\?Q\?s\?\= message of "Sun, 12 Apr 2020 11:19:52 +0200")
Hi,
Ludovic Courtès <ludo@gnu.org> skribis:
> https://web.fdn.fr/~lcourtes/software/guix/1.1.0rc2
> e830c2a8de vm: Transparently compress iso9660 images.
Here’s a comparison of the size of the ISO images for rc1 and rc2:
--8<---------------cut here---------------start------------->8---
$ du -h release-1.0.1.13450-01d5f2/guix-system-install-1.0.1.13450-01d5f2.x86_64-linux.iso.xz release-1.1.0rc2/guix-system-install-1.1.0rc2.x86_64-linux.iso.xz
260M release-1.0.1.13450-01d5f2/guix-system-install-1.0.1.13450-01d5f2.x86_64-linux.iso.xz
405M release-1.1.0rc2/guix-system-install-1.1.0rc2.x86_64-linux.iso.xz
$ xz -d < release-1.0.1.13450-01d5f2/guix-system-install-1.0.1.13450-01d5f2.x86_64-linux.iso.xz | wc -c
1524205568
$ xz -d < release-1.1.0rc2/guix-system-install-1.1.0rc2.x86_64-linux.iso.xz | wc -c
589223936
--8<---------------cut here---------------end--------------->8---
As you can see:
• The xz-compressed ISO of rc2 is 1.6 times bigger than that of rc1.
• The uncompressed ISO of rc2 is 2.6 times smaller than that of rc1.
It’s not surprising that xz has a hard time compressing an
already-compressed image, but I find it surprising that the end result
is almost twice as big.
“make release” uses the default xz compression ratio, -6. I tried
different levels and different compression tools (though I don’t want to
change from xz now because this would likely break documentation and
links all around) and it seems we can’t really do any better:
--8<---------------cut here---------------start------------->8---
560M /tmp/t.iso
415M /tmp/t.iso.gz
406M /tmp/t.iso.lz-6
412M /tmp/t.iso.xz-0
407M /tmp/t.iso.xz-3
404M /tmp/t.iso.xz-8
--8<---------------cut here---------------end--------------->8---
Thoughts? Ideas?
Ludo’.
next prev parent reply other threads:[~2020-04-13 14:42 UTC|newest]
Thread overview: 73+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-24 20:06 bug#38735: GuixSD graphical Installer hangs on connecting to wifi Jesse Gibbons
2019-12-26 20:32 ` Danny Milosavljevic
2019-12-29 16:01 ` Ludovic Courtès
2020-01-03 4:10 ` Jesse Gibbons
2020-04-12 9:19 ` 1.1.0rc2 available for testing! Ludovic Courtès
2020-04-12 9:35 ` Danny Milosavljevic
2020-04-12 9:38 ` Danny Milosavljevic
2020-04-12 9:36 ` pelzflorian (Florian Pelz)
2020-04-12 12:09 ` bug#40572: installer networking: Connman detects no technologies on Acer Aspire pelzflorian (Florian Pelz)
2020-04-12 14:24 ` Mathieu Othacehe
2020-04-12 15:14 ` pelzflorian (Florian Pelz)
2020-04-12 15:41 ` pelzflorian (Florian Pelz)
2020-04-12 16:34 ` pelzflorian (Florian Pelz)
2020-04-12 17:28 ` pelzflorian (Florian Pelz)
2020-04-12 16:52 ` Danny Milosavljevic
2020-04-12 16:56 ` Danny Milosavljevic
2020-04-12 17:09 ` pelzflorian (Florian Pelz)
2020-04-12 17:45 ` pelzflorian (Florian Pelz)
2020-04-12 18:47 ` Danny Milosavljevic
2020-04-13 7:36 ` pelzflorian (Florian Pelz)
2020-04-13 11:20 ` Danny Milosavljevic
2020-04-13 14:13 ` Ludovic Courtès
2020-04-12 17:37 ` Mathieu Othacehe
2020-04-12 18:43 ` pelzflorian (Florian Pelz)
[not found] ` <87blnvmzub.fsf@gnu.org>
2020-04-13 11:57 ` pelzflorian (Florian Pelz)
2020-04-13 13:18 ` Ludovic Courtès
2020-04-13 15:03 ` pelzflorian (Florian Pelz)
[not found] ` <20200413155202.rjmnp4v2vnrpq3vc@pelzflorian.localdomain>
2020-04-13 17:11 ` Ludovic Courtès
2020-04-13 18:14 ` pelzflorian (Florian Pelz)
2020-04-13 21:56 ` pelzflorian (Florian Pelz)
2020-04-13 22:19 ` Ludovic Courtès
2020-04-13 22:25 ` Ludovic Courtès
2020-04-14 0:43 ` pelzflorian (Florian Pelz)
2020-04-14 9:03 ` Ludovic Courtès
2020-04-14 9:40 ` pelzflorian (Florian Pelz)
2020-04-14 12:00 ` pelzflorian (Florian Pelz)
2020-04-14 14:36 ` Ludovic Courtès
2020-04-14 18:40 ` pelzflorian (Florian Pelz)
2020-04-14 20:17 ` Ludovic Courtès
2020-04-14 21:30 ` pelzflorian (Florian Pelz)
2020-04-14 21:50 ` Ludovic Courtès
2020-04-14 22:49 ` Bengt Richter
2020-04-13 22:24 ` pelzflorian (Florian Pelz)
2020-04-13 7:42 ` 1.1.0rc2 available for testing! pelzflorian (Florian Pelz)
2020-04-13 10:41 ` Ludovic Courtès
2020-04-13 11:54 ` Mathieu Othacehe
2020-04-13 14:44 ` Ludovic Courtès
2020-04-14 12:25 ` Maxim Cournoyer
2020-04-14 14:24 ` Mathieu Othacehe
2020-04-15 1:22 ` Maxim Cournoyer
2020-04-15 16:58 ` Ludovic Courtès
2020-04-15 17:30 ` Mathieu Othacehe
2020-04-16 8:20 ` Ludovic Courtès
2020-04-13 11:07 ` bug#38735: " Robert Smith
2020-04-13 11:07 ` Robert Smith
2020-04-13 13:45 ` Ludovic Courtès
2020-04-13 15:56 ` bug#38735: " Robert Smith
2020-04-13 15:56 ` Robert Smith
2020-04-13 20:28 ` bug#38735: " Ludovic Courtès
2020-04-13 20:28 ` Ludovic Courtès
2020-04-13 21:42 ` bug#38735: " Robert Smith
2020-04-13 21:42 ` Robert Smith
2020-04-13 13:45 ` bug#38735: " Ludovic Courtès
2020-04-15 14:07 ` Tobias Geerinckx-Rice via Bug reports for GNU Guix
2020-04-15 14:07 ` Tobias Geerinckx-Rice
2020-04-15 14:15 ` bug#38735: " Tobias Geerinckx-Rice via Bug reports for GNU Guix
2020-04-13 14:42 ` Ludovic Courtès [this message]
2020-04-13 14:55 ` Compressed ISO image got bigger Jonathan Brielmaier
2020-04-13 20:37 ` Ludovic Courtès
2020-04-13 21:52 ` Tobias Geerinckx-Rice
2020-04-14 10:36 ` Ludovic Courtès
2020-04-14 9:37 ` bug#40624: installer: info manual language does not adapt to locale pelzflorian (Florian Pelz)
2020-04-14 11:02 ` Ludovic Courtès
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