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bug#44053: ‘xdg-mime-database’ profile hook is slow
From: |
Ludovic Courtès |
Subject: |
bug#44053: ‘xdg-mime-database’ profile hook is slow |
Date: |
Mon, 02 Nov 2020 15:04:14 +0100 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) |
Ludovic Courtès <ludo@gnu.org> skribis:
> Ludovic Courtès <ludo@gnu.org> skribis:
>
>> Apart from LibreOffice, I found that ‘share/mime/packages’ is provided
>> by at least: hugin, gcr, fontforge. Most GUI packages don’t have it.
>> So in practice, we’re often rebuilding the exact same database.
>
> On closer inspection, the time-consuming bit is processing
> ‘share/mime/packages/freedesktop.org.xml’ (from ‘shared-mime-info’),
> which is quite large and leads to the creation of hundreds of file. We
> end up re-processing it every time. This is particularly wasteful
> because the ‘shared-mime-info’ package already contains the result of
> applying ‘update-mime-database’ to itself.
Based on these observations, I added a fast path to the
‘xdg-mime-database’ hook:
https://git.savannah.gnu.org/cgit/guix.git/commit/?id=76ea70bd70aeb76570445c11cea2f98139192b54
It’s down to 0s in the common case where the profile doesn’t contain any
packages providing ‘share/mime/packages’.
Ludo’.