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‘xdg-mime-database’ profile hook is slow
From: |
Ludovic Courtès |
Subject: |
‘xdg-mime-database’ profile hook is slow |
Date: |
Wed, 21 Oct 2020 11:49:28 +0200 |
User-agent: |
Gnus/5.13 (Gnus v5.13) Emacs/27.1 (gnu/linux) |
Hi,
Joshua Branson <jbranso@dismail.de> skribis:
> I don't want to complain (because I'm probably not going to be able to
> fix any issues that I spot), but it does seem to take a while for me to
> install packages, at least the XDG mime step. It's not a huge issue for
> me. I just realize that installing packages takes more time . :) But
> if we are calling this an "issue", your suggestion to use numerous
> packages seems like a "work-around" rather than a "fix".
Just having identified which part is low is already a step forward. :-)
I hadn’t noticed, but indeed the “XDG MIME database” steps takes a
while. For my “big” user profile, on an SSD, it takes more than 4s:
--8<---------------cut here---------------start------------->8---
$ time guix build --check $(guix gc -R $(guix gc --derivers $(readlink -f
~/.guix-profile)) |grep xdg-mime-database.drv)
The following profile hook will be built:
/gnu/store/dhcv26m2k3kyx92wf9palp8byhblgjrr-xdg-mime-database.drv
building XDG MIME database...
successfully built
/gnu/store/dhcv26m2k3kyx92wf9palp8byhblgjrr-xdg-mime-database.drv
/gnu/store/q25yv8hil0281x7zm25l259xvjfwwrsx-xdg-mime-database
real 0m4.241s
user 0m1.689s
sys 0m0.101s
$ guix package -I |wc -l
296
--8<---------------cut here---------------end--------------->8---
It’s worse on a cold cache:
--8<---------------cut here---------------start------------->8---
$ drv="$(guix gc -R $(guix gc --derivers $(readlink -f ~/.guix-profile)) |grep
xdg-mime-database.drv)"
$ sudo sh -c 'echo 3 > /proc/sys/vm/drop_caches'
$ time guix build --check "$drv"
The following profile hook will be built:
/gnu/store/dhcv26m2k3kyx92wf9palp8byhblgjrr-xdg-mime-database.drv
building XDG MIME database...
successfully built
/gnu/store/dhcv26m2k3kyx92wf9palp8byhblgjrr-xdg-mime-database.drv
/gnu/store/q25yv8hil0281x7zm25l259xvjfwwrsx-xdg-mime-database
real 0m5.872s
user 0m0.314s
sys 0m0.102s
--8<---------------cut here---------------end--------------->8---
And it’s probably worse on spinning disks? What timings do you get?
We should profile this hook and see if it’s the ‘union-build’ call
that’s taking time or the ‘update-mime-database’ invocation.
‘union-build’ tends to be very I/O-intensive.
Thanks,
Ludo’.
- Re: Removing/replacing “Guix in action” video from the home page?, (continued)
- Re: Removing/replacing “Guix in action” video from the home page?, Ludovic Courtès, 2020/10/13
- Re: Removing/replacing “Guix in action” video from the home page?, Luis Felipe, 2020/10/13
- Re: Removing/replacing “Guix in action” video from the home page?, Joshua Branson, 2020/10/14
- Re: Removing/replacing “Guix in action” video from the home page?, Ludovic Courtès, 2020/10/16
- Re: Removing/replacing “Guix in action” video from the home page?, zimoun, 2020/10/16
- Re: Removing/replacing “Guix in action” video from the home page?, Luis Felipe, 2020/10/16
- Re: Removing/replacing “Guix in action” video from the home page?, Maxim Cournoyer, 2020/10/17
- Re: Removing/replacing “Guix in action” video from the home page?, zimoun, 2020/10/18
- Re: Removing/replacing “Guix in action” video from the home page?, Joshua Branson, 2020/10/18
- ‘xdg-mime-database’ profile hook is slow,
Ludovic Courtès <=
- Re: ‘xdg-mime-database’ profile hook is slow, zimoun, 2020/10/21
- Re: ‘xdg-mime-database’ profile hook is slow, Joshua Branson, 2020/10/27
- Re: ‘xdg-mime-database’ profile hook is slow, Luis Felipe, 2020/10/28
- Re: ‘xdg-mime-database’ profile hook is slow, zimoun, 2020/10/28
- Re: ‘xdg-mime-database’ profile hook is slow, Luis Felipe, 2020/10/29
- Re: Removing/replacing “Guix in action” video from the home page?, jbranso, 2020/10/16
- Re: Removing/replacing “Guix in action” video from the home page?, Luis Felipe, 2020/10/16
- Re: Removing/replacing “Guix in action” video from the home page?, Joshua Branson, 2020/10/27
- Re: Removing/replacing “Guix in action” video from the home page?, Tobias Geerinckx-Rice, 2020/10/28
- Re: Removing/replacing “Guix in action” video from the home page?, jbranso, 2020/10/28