https://bugs.kde.org/show_bug.cgi?id=466671
Bug ID: 466671
Summary: Discover is very slow to fetch updates
Classification: Applications
Product: Discover
Version: 5.27.1
Platform: Fedora RPMs
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: PackageKit
Assignee: plasma-b...@kde.org
Reporter: zi...@kayari.org
CC: aleix...@kde.org
Target Milestone: ---
SUMMARY
When opening discover from the systray widget when it shows updates are
available, it takes 30+ seconds to show the available updates. The previous
cause of slowness was supposed to have been fixed (Bug 457408) but I see no
improvement in the default use case of "click on the systray widget when it
shows updates". Maybe something got fixed in the KNewStuff backend, but there's
another cause of slowness, and it has the same symptom: the "Fetching
updates..." progress bar goes to about 97% immediately, then stops for 30
seconds.
The same slowness happens when clicking the "Refresh" button.
STEPS TO REPRODUCE
1. plasma-discover --mode Update
2. click Refresh
3. waaaaaaaiiiiiiiiiiiiiit
OBSERVED RESULT
Slow
EXPECTED RESULT
More fastish!
SOFTWARE/OS VERSIONS
Operating System: Fedora Linux 37
KDE Plasma Version: 5.27.1
KDE Frameworks Version: 5.103.0
Qt Version: 5.15.8
Kernel Version: 6.1.11-200.fc37.x86_64 (64-bit)
Graphics Platform: X11
Processors: 12 × Intel® Core™ i7-9850H CPU @ 2.60GHz
Memory: 31.1 GiB of RAM
Graphics Processor: Mesa Intel® UHD Graphics 630
ADDITIONAL INFORMATION
$ plasma-discover --listbackends
Available backends:
* fwupd-backend
* kns-backend
* flatpak-backend
* packagekit-backend
By a process of elimination I found that it's the packagekit backend that's
slow. Clicking Refresh after running it as 'plasma-discover --mode Update
--backends fwupd-backend,flatpak-backend,kns-backend' finished almost
immediately, and any combination of backends that doesn't involve
packagekit-backend is fast. Any combination that involves packagekit-backend
(including just that one, i.e. --backends packagekit-backend) takes 30+
seconds.
DNF and PackageKit can both refresh their package lists in far less time than
Discover can:
$ time pkcon refresh
Refreshing cache [=========================]
Loading cache [=========================]
Finished [=========================]
real 0m0.352s
user 0m0.007s
sys 0m0.007s
$ time sudo dnf check-update --refresh
Copr repo for centpkg owned by james
7.2 kB/s | 3.3 kB 00:00
Copr repo for elektroid owned by jwakely
7.3 kB/s | 3.3 kB 00:00
Fedora 37 - x86_64
35 kB/s | 18 kB 00:00
Fedora 37 openh264 (From Cisco) - x86_64
1.7 kB/s | 989 B 00:00
Fedora Modular 37 - x86_64
31 kB/s | 18 kB 00:00
Fedora 37 - x86_64 - Updates
29 kB/s | 14 kB 00:00
Fedora Modular 37 - x86_64 - Updates
37 kB/s | 17 kB 00:00
google-chrome
5.7 kB/s | 1.3 kB 00:00
RCM Tools for Fedora 37 (RPMs)
5.5 kB/s | 3.8 kB 00:00
RPM Fusion for Fedora 37 - Free
38 kB/s | 6.8 kB 00:00
RPM Fusion for Fedora 37 - Free - Updates
18 kB/s | 6.5 kB 00:00
RPM Fusion for Fedora 37 - Nonfree
40 kB/s | 6.9 kB 00:00
RPM Fusion for Fedora 37 - Nonfree - Updates
39 kB/s | 6.6 kB 00:00
RHEL8 CSB packages
6.2 kB/s | 3.0 kB 00:00
real 0m7.659s
user 0m2.361s
sys 0m0.227s
In fact I can usually check *and install* all updates using dnf before Discover
has even managed to show me the available updates.
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