I attached lp:~mvo/software-center/memleak-fixes-lp1003466 that is worth
testing, that kills off most of the growth for me in my (artificial)
testing. Dave, when you do install testing next, would be nice to give
this branch a try :)

** Branch linked: lp:~mvo/software-center/memleak-fixes-lp1003466

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https://bugs.launchpad.net/bugs/1003466

Title:
  Software Center Memory/Processor bug

Status in “software-center” package in Ubuntu:
  Triaged

Bug description:
  Bug Description:
  Software Centers memory usage increases the more applications you install, to 
monitor this effect I am going to do a single For Purchase install and the an 
run with 7 For Purchase apps and attach the logs to this bug.

  Then a single repo app and then several repo apps.

  OS:
  64bit Precise

  USC Version:
  5.2.1

  Steps To Reproduce:
  1. Open USC install an app.
  2. Click on All software once app 1 has installed
  3. Install another app
  4. Click on All Software once app 2 has installed
  5. install another app and so on
  6. monitor the memory used at each point ( I used ldtp's 
startlog('path/to/log.file') startprocessmonitor('software-center') then when 
finished stopprocessmonitor('software-center') stoplog()

  Expected Results:
  I expect the memory usage to not increase more than a set amount per app 
install.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.04
  Package: software-center 5.2.1
  ProcVersionSignature: Ubuntu 3.2.0-24.38-generic 3.2.16
  Uname: Linux 3.2.0-24-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.0.1-0ubuntu7
  Architecture: amd64
  Date: Wed May 23 15:32:24 2012
  InstallationMedia: Ubuntu 12.04 LTS "Precise Pangolin" - Release amd64 
(20120425)
  PackageArchitecture: all
  ProcEnviron:
   LANGUAGE=en_GB:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_GB.UTF-8
   SHELL=/bin/bash
  SourcePackage: software-center
  UpgradeStatus: No upgrade log present (probably fresh install)

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