Public bug reported:
Hi,
I was actually looking for needrestart as it has the last messages in an apt
transaction and then seems to stall. But I found that it isn't
/etc/apt/apt.conf.d/99needrestart
instead it is the other 99 which is
/etc/apt/apt.conf.d/99update-notifier
I've littered the steps it executes for debugging and found that the
final call to `/usr/lib/update-notifier/apt-check --human-readable`
takes about 4 seconds.
Here at the end of an `apt install --reinstall` of any package.
DEBUG I 07:04:54.330869746
DEBUG II 07:04:54.331734979
DEBUG III 07:04:54.350096999
DEBUG IV 07:04:54.360757929
DEBUG V 07:04:54.376343616
DEBUG VI 07:04:54.379049099
DEBUG VII 07:04:54.386505261
DEBUG VIII 07:04:58.824188091 <<< those 4 seconds
DEBUG IX 07:04:58.826370395
DEBUG IX 07:04:58.827825319
The time varies on system HW and installed packages, but is always at an
annoying >1sec.
If not just an automated background install people often wait for apt to
complete to be able to do the next steps.
And then apt seeming complete (it is actually) but having this artificial delay
makes Ubuntu feel slow every time.
This is only meant to populate /var/lib/update-notifier/updates-
available with some content to be used by the notifier later. I don't
know if there are other consumers of this file, but you'd think that the
motd infrastructure would certainly be ok if this is complete slightly
after the apt transaction.
Somewhere in the back of my mind was that this was tried ...
And what makes me suspicious is at least:
# let the actual update be asynchronous to avoid stalling apt-get
cleanup() { rm -f "$tmpfile"; }
I checked the change-log for it and found bug 1527710 which explains why
- currently - it isn't asynchronous anymore. (The changelog also
explains why I thought to remember this being async, I did that myself 6
years ago). I have to agree all those issues with the asynchronicity
back then were bad, but while the current stall isn't as "breaking" is
is really bad on the "user inconvenience" side of things.
I wanted to file this bug (despite it being tried in the past) to
discuss if we could find a way to disconnect these and make apt fast
again.
** Affects: update-notifier (Ubuntu)
Importance: Undecided
Status: New
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https://bugs.launchpad.net/bugs/1936175
Title:
apt hook slows down apt - could this be asynchronous?
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