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[Markus Lutz <870042@xxxxxxxxxxxxxxxxxx>]

I'm not sure, if it is correct to post here, but I had a similar problems since I updated to ubuntu 14.04 LTS (x86_64k). Sometimes I had more than 500MB for each compiz and xorg, which once summed up in 1,2 GB. The system was very slow, then I even thought it had been freezed (but it wasn't), even with a total memory of 4 GB. 
I used the drivers form http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu, installed the newest kernel, nothing seemed to help.

Finally I tried installing xserver-xorg-video-ati , which hadn't been
installed, and voila now the system is fast again as it should be,
although it seems as if the same driver (radeon) is used.

Current system:
Ubuntu 14.04 LTS (x86_64k), kernel 3.14.1,  [AMD/ATI] RS880 [Radeon HD 4250], radeon graphic driver ( recent drivers from: http://ppa.launchpad.net/oibaf/graphics-drivers/ubuntu )

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https://bugs.launchpad.net/bugs/870042

Title:
  Memory leak in compiz (and maybe Xorg)

Status in Unity:
  Incomplete
Status in X.Org X server:
  New
Status in “unity” package in Ubuntu:
  Incomplete

Bug description:
  Compiz and Xorg both use large amounts of RAM, right now on my system
  compiz is using 206 megabytes (and growing) and Xorg is using 176
  megabytes.

  ProblemType: Bug
  DistroRelease: Ubuntu 11.10
  Package: unity 4.22.0-0ubuntu2
  ProcVersionSignature: Ubuntu 3.0.0-12.19-generic 3.0.4
  Uname: Linux 3.0.0-12-generic x86_64
  NonfreeKernelModules: nvidia
  .proc.driver.nvidia.gpus.0: Error: [Errno 21] Is a directory: '/proc/driver/nvidia/gpus/0'
  .proc.driver.nvidia.registry: Binary: ""
  .proc.driver.nvidia.version:
   NVRM version: NVIDIA UNIX x86_64 Kernel Module  280.13  Wed Jul 27 16:53:56 PDT 2011
   GCC version:  gcc version 4.6.1 (Ubuntu/Linaro 4.6.1-9ubuntu3)
  .tmp.unity.support.test.0:
   
  ApportVersion: 1.23-0ubuntu2
  Architecture: amd64
  CompizPlugins: [core,bailer,detection,composite,opengl,decor,mousepoll,vpswitch,regex,animation,snap,expo,move,compiztoolbox,place,grid,imgpng,gnomecompat,wall,ezoom,workarounds,resize,fade,unitymtgrabhandles,scale,session,unityshell]
  CompositorRunning: compiz
  Date: Fri Oct  7 09:39:06 2011
  DistUpgraded: Log time: 2011-10-04 18:54:48.035566
  DistroCodename: oneiric
  DistroVariant: ubuntu
  DkmsStatus:
   nvidia-current, 280.13, 3.0.0-12-generic, x86_64: installed
   vboxhost, 4.1.2, 3.0.0-12-generic, x86_64: installed
  GraphicsCard:
   nVidia Corporation Device [10de:1251] (rev a1) (prog-if 00 [VGA controller])
     Subsystem: CLEVO/KAPOK Computer Device [1558:5102]
  InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110921.2)
  JockeyStatus:
   xorg:nvidia_current - NVIDIA accelerated graphics driver (Proprietary, Enabled, In use)
   xorg:nvidia_current_updates - NVIDIA accelerated graphics driver (post-release updates) (Proprietary, Disabled, Not in use)
  MachineType: System76, Inc. Gazelle Professional
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=ec478c56-ee35-4e4e-9915-ddd75d17f872 ro quiet splash pcie_aspm=off vt.handoff=7
  SourcePackage: unity
  UpgradeStatus: Upgraded to oneiric on 2011-10-04 (2 days ago)
  dmi.bios.date: 08/09/2011
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 4.6.4
  dmi.board.asset.tag: Not Applicable
  dmi.board.name: Gazelle Professional
  dmi.board.vendor: System76, Inc.
  dmi.board.version: gazp6
  dmi.chassis.asset.tag: Not Applicable
  dmi.chassis.type: 10
  dmi.chassis.vendor: System76, Inc.
  dmi.chassis.version: gazp6
  dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.4:bd08/09/2011:svnSystem76,Inc.:pnGazelleProfessional:pvrgazp6:rvnSystem76,Inc.:rnGazelleProfessional:rvrgazp6:cvnSystem76,Inc.:ct10:cvrgazp6:
  dmi.product.name: Gazelle Professional
  dmi.product.version: gazp6
  dmi.sys.vendor: System76, Inc.
  version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu3
  version.ia32-libs: ia32-libs 20090808ubuntu25
  version.libdrm2: libdrm2 2.4.26-1ubuntu1
  version.libgl1-mesa-dri: libgl1-mesa-dri 7.11-0ubuntu3
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 7.11-0ubuntu3
  version.nvidia-graphics-drivers: nvidia-graphics-drivers N/A
  version.xserver-xorg: xserver-xorg 1:7.6+7ubuntu7
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.6.0-1ubuntu13
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:6.14.99~git20110811.g93fc084-0ubuntu1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.15.901-1ubuntu2
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:0.0.16+git20110411+8378443-1

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