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bug#44053: ‘xdg-mime-database’ profile hook is slow
From: |
zimoun |
Subject: |
bug#44053: ‘xdg-mime-database’ profile hook is slow |
Date: |
Wed, 04 Nov 2020 00:32:39 +0100 |
Hi,
>
> https://git.savannah.gnu.org/cgit/guix.git/commit/?id=76ea70bd70aeb76570445c11cea2f98139192b54
Clever workaround! What are now the performances on previous examples
(same profiles and same packages)?
> Unfortunately, AIUI,
>
> update-mime-database(X ∪ Y) ≠ update-mime-database(X) ∪
> update-mime-database(Y)
Hum? Interesting… well weird! If it is not a “morphism” then it is not
really an updater. Anyway.
I am curious about the comparison:
time(update-mime-database(X ∪ Y))
vs
time(update-mime-database(X)) + time(update-mime-database(Y))
vs
time(update-mime-database(X ∩ Y))
> So it would seem we cannot simply used the pre-built database from
> ‘shared-mime-info’ and merge it with that of the other packages, at
> least not without changing ‘update-mime-database’ or re-implementing
> parts of it on our side.
’shared-mime-info’ is simply a package, right? So what does it means:
«Find a way to avoid reprocessing 'shared-mime-info'» in:
--8<---------------cut here---------------start------------->8---
;; the database. TODO: Find a way to avoid reprocessing
;; 'shared-mime-info', which is the most expensive one.
[...]
(invoke #+(file-append shared-mime-info
"/bin/update-mime-database")
destdir)))))))
--8<---------------cut here---------------end--------------->8---
? Well, I miss why and how ’shared-mime-info’ could be the culprit here
or what could be improved with “shared-mime-info”? Maybe replace the
“lazy reference” by a strict one if it makes sense.
All the best,
simon