https://bugs.documentfoundation.org/show_bug.cgi?id=158731
Bug ID: 158731
Summary: rpm packages don't use the maximum force for xz
compression
Product: LibreOffice
Version: 24.8.0.0 alpha0+ Master
Hardware: All
OS: Linux (All)
Status: UNCONFIRMED
Severity: normal
Priority: medium
Component: Installation
Assignee: [email protected]
Reporter: [email protected]
>From the daily build language pack
LibreOfficeDev_24.8.0.0.alpha0_Linux_x86-64_rpm_langpack_de.tar.gz, 7z tells
that the below rpm uses the xz compression method :
------------------------------
$ 7z l libreofficedev24.8-dict-de-24.8.0.0.alpha0-1.x86_64.rpm
[...]
Path = libreofficedev24.8-dict-de-24.8.0.0.alpha0-1.x86_64.cpio.xz
Type = xz
Physical Size = 16392316
Method = LZMA2:20 SHA256
Streams = 1
Blocks = 28
------------------------------
Next, I extracted the content of this rpm package with the below command :
7z x libreofficedev24.8-dict-de-24.8.0.0.alpha0-1.x86_64.rpm
This extracts the below file :
libreofficedev24.8-dict-de-24.8.0.0.alpha0-1.x86_64.cpio
Next I compressed this cpio archive with xz using the minimum and maximum force
:
------------------------------
$ xz -1 --stdout libreofficedev24.8-dict-de-24.8.0.0.alpha0-1.x86_64.cpio >
d-1.xz
$ xz -9 --stdout libreofficedev24.8-dict-de-24.8.0.0.alpha0-1.x86_64.cpio >
d-9.xz
------------------------------
Looking at the size of the files, it seems the rpm uses a low compression force
of xz :
------------------------------
$ ls -lhS *
-rw-r--r-- 1 j j 82M déc. 16 03:39
libreofficedev24.8-dict-de-24.8.0.0.alpha0-1.x86_64.cpio
-rw-r--r-- 1 j j 16M déc. 16 03:39
libreofficedev24.8-dict-de-24.8.0.0.alpha0-1.x86_64.rpm
-rw-r--r-- 1 j j 16M déc. 16 12:06 d-1.xz
-rw-r--r-- 1 j j 3,8M déc. 16 12:05 d-9.xz
------------------------------
The memory requirement on GNU/Linux in order to use LibreOffice is at least
256MB but prefered 512MB :
https://www.libreoffice.org/get-help/system-requirements/#Linux
The man page of xz tells :
"decompressing a file created with xz -9 currently requires 65 MiB of memory".
So there is no limitation to use the maximum force ("-9") for xz compression
inside rpm.
Users would then be able to download rpm files faster. The servers would save
storage and bandwidth. As this is a single compression for many downloads, the
maximum compression force for xz would provide an overall benefit.
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