[Bug 852128] Re: Poor performance while "Calculating changes"

[Ondřej Buriánek]

-- 
You received this bug notification because you are a member of Ubuntu
Foundations Bugs, which is subscribed to update-manager in Ubuntu.
https://bugs.launchpad.net/bugs/852128

Title:
  Poor performance while "Calculating changes"

Status in “update-manager” package in Ubuntu:
  New

Bug description:
  I've found performance issue in Distribution Upgrade -> phase Setting new software channels -> Calculating the changes....
  Writing in 
    * /var/log/dist-upgrade/apt.log
  is IMHO done char by char.

  When mounting 
    * sudo mount -t tmpfs -o size=256M tmpfs /var/log/dist-upgrade
  upgrade is much faster.

  I found this inconvenience while upgrading Natty to Oneiric with broken dependencies. Upgrade couldn't solve manually installed ia32-libs with nspluginwrapper. When I was watching
    * tail -f /var/log/dist-upgrade/apt.log
  characters were added slowly one by one. Writing 42KB log shouldn't take almost a minute :).

  Test results committed afterwards:

  Conflicted on HDD  1min+
  Conflicted on RAM  16sec

  Successful on HDD  28sec
  Successful on RAM  12sec

  ProblemType: Bug
  DistroRelease: Ubuntu 11.04
  Package: update-manager 1:0.150.3
  ProcVersionSignature: Ubuntu 2.6.38-11.49-generic 2.6.38.8
  Uname: Linux 2.6.38-11-generic x86_64
  NonfreeKernelModules: fglrx
  Architecture: amd64
  Date: Fri Sep 16 20:39:48 2011
  GConfNonDefault:
   /apps/update-manager/check_new_release_ignore=
   /apps/update-manager/first_run=false
   /apps/update-manager/show_details=true
   /apps/update-manager/window_size=(600,600)
  InstallationMedia: Ubuntu 10.04 LTS "Lucid Lynx" - Release amd64 (20100427.1)
  PackageArchitecture: all
  SourcePackage: update-manager
  UpgradeStatus: Upgraded to natty on 2011-09-16 (0 days ago)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/update-manager/+bug/852128/+subscriptions