[Bug 628657] Re: freezes for > 10s when displaying long changelogs

[Tormod Volden]

Certainly happening in xenial, which is still supported. Clicking on a
kernel package makes it hang for a long time. Still have to apply my
above patch.

** Changed in: update-manager (Ubuntu)
       Status: Invalid => Confirmed

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Title:
  freezes for > 10s when displaying long changelogs

Status in update-manager package in Ubuntu:
  Confirmed

Bug description:
  Binary package hint: update-manager

  There are a bunch of openoffice packages in proposed right now. When
  selecting on of these in update-manager (does not matter if I have
  "Description of update" open or not) the GUI freezes and the CPU goes
  high for 10 seconds while "Downloading list of changes" is displayed.
  If I click a non-oo package the response is immediate. Selecting the
  same oo package again causes the same freeze/CPU churn.

  I do not know how to trace a pile of python, but find enclosed a
  ltrace in case it can cast some light over it.

  When I ran ltrace -c on it, the one click caused 6 minutes of waiting yielding these results:
  % time     seconds  usecs/call     calls      function
  ------ ----------- ----------- --------- --------------------
   15.23   85.527228         186    459799 free
   15.13   84.985249         161    525668 memcpy
   12.31   69.140534         142    485820 memset
   10.55   59.279684         141    419911 malloc
    8.67   48.723256         211    230058 strchr

  plz rewrite update-manager in c thx bye :-P

  ProblemType: Bug
  DistroRelease: Ubuntu 10.04
  Package: update-manager 1:0.134.10
  ProcVersionSignature: Ubuntu 2.6.32-24.41-generic 2.6.32.15+drm33.5
  Uname: Linux 2.6.32-24-generic i686
  Architecture: i386
  Date: Thu Sep  2 08:57:19 2010
  ExecutablePath: /usr/bin/update-manager
  InstallationMedia: Ubuntu 9.10 "Karmic Koala" - Release i386 (20091028.5)
  InterpreterPath: /usr/bin/python2.6
  PackageArchitecture: all
  ProcEnviron:
   PATH=(custom, user)
   LANG=en_US.utf8
   SHELL=/bin/bash
  SourcePackage: update-manager

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