Ubuntu 24.10 (Oracular Oriole) has reached end of life, so this bug will
not be fixed for that specific release.
** Changed in: ubuntu-drivers-common (Ubuntu Oracular)
Status: Fix Committed => Won't Fix
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https://bugs.launchpad.net/bugs/2092601
Title:
ubuntu-drivers list - Extremely slow
Status in ubuntu-drivers-common package in Ubuntu:
Fix Released
Status in ubuntu-drivers-common source package in Oracular:
Won't Fix
Status in ubuntu-drivers-common source package in Plucky:
Fix Released
Bug description:
[Impact]
Some basic operations on ubuntu-drivers are extremely slow (> 1mn) and
CPU-intensive, to the point that users might think it broken.
Examples of such operations are
ubuntu-drivers list
ubuntu-drivers list-oem
Both of those operations are used in subiquity. While the performance
hit there might not be too noticeable due to parallelism with other
steps of the install, it's still fairly bad.
And of course users of both the ubuntu-drivers CLI and the software-
properties panel GUI feel the impact in full.
[Expected result]
ubuntu-drivers takes seconds to run, not minutes.
[Steps to reproduce]
1. Run 'time ubuntu-drivers list' several times
2. observe the time
[Proposed fix]
https://github.com/canonical/ubuntu-drivers-common/pull/116
There is an issue when trying to compute a stable key to cache the
results of a costly computation (modalias mapping), resulting in a
write-only cache.
The fix is to remove the cache entirely, expose the computation method
as a new public API, and let the caller optionally provide the
previously cached value.
[Test plan]
1. Run 'time ubuntu-drivers list' several times
the test should take mere seconds instead of tens of seconds or even minutes
[Where problems could occur]
Regression risks are minimal: for all the use cases listed above, the call
sites are within ubuntu-drivers-common and have been inspected for correctness
of hoisting the modalias mapping out of the loop. Any other caller of the
changed API doesn't need to be changed as the new argument is optional. The
removal of the cache is essentially a NOP since cached values weren't retrieved
anyway due to the original bug.
[Original report]
Looking for drivers is extremely slow.
Verified to exist on multiple systems.
----------------
$ time ubuntu-drivers list
nvidia-driver-560-open, (kernel modules provided by
linux-modules-nvidia-560-open-generic-hwe-24.04)
nvidia-driver-560, (kernel modules provided by
linux-modules-nvidia-560-generic-hwe-24.04)
real 1m48.680s
user 0m26.984s
sys 1m21.665s
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