[Bug 2112442] Re: noble regression: update-manager takes > 30s to start

[Tormod Volden]

I patched it this way, and now I got the attached profiling output:

--- a/UpdateManager/UpdateManager.py
+++ b/UpdateManager/UpdateManager.py
@@ -31,6 +31,9 @@ GdkX11  # pyflakes
 
 import warnings
 
+import cProfile
+import re
+
 warnings.filterwarnings(
     "ignore", "Accessed deprecated property", DeprecationWarning
 )
@@ -242,8 +245,12 @@ class UpdateManager(Gtk.Window):
         self._start_pane(install_backend)
 
     def start_available(self, cancelled_update=False, error_occurred=False):
+        pr = cProfile.Profile()
+        pr.enable()
         self._look_busy()
         self.refresh_cache()
+        pr.disable()
+        pr.print_stats()
 
         if self.cache is None:
             return


** Attachment added: "upd-man-profiled.txt"
   https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/2112442/+attachment/5881970/+files/upd-man-profiled.txt

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https://bugs.launchpad.net/bugs/2112442

Title:
  noble regression: update-manager takes > 30s to start

Status in update-manager package in Ubuntu:
  New

Bug description:
  After upgrading update-manager from 1:24.04.9 to 1:24.04.12 today,
  update-manager now takes more than 30 seconds to start up, with CPU
  time of e.g. 47 seconds, before the main GUI is displayed. It is the
  same when using the -no-update option, and whether there are packages
  to be updated or not.

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