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[Bug 888039] [NEW] Gradual degradation in desktop performance.


Public bug reported:

Over the span of 1-3 days I see my desktop consistently become more
sluggish. The functions most affected are window movement, file
movement, and sometimes window resizing. Other animations (such as
minimizing fades, switching desktops, expo mode) are not affected when
this degradation occurs. They remain smooth; however, I have let the
problem go on as long as to find out that eventually all desktop
animations/effects will degrade, it just takes a lot lot longer. I find
that my actual 3D gaming goes unaffected (though I have no data to back
that up, perhaps it does).

I have recorded the output of 'ps auxw' and have slowly watched the VSZ
and RSS memory columns creep upwards. A fresh compiz session will see
675164 and 169860, respectively. After a day or two it will result in as
high as 878552 and 255664. I have attached a log output from an hourly
cron job (though I had suspended for a few days because of travel).

After the degradation has occurred compiz will consistently use higher
CPU. Dragging a terminal window while watching top: before: ~10%, after:
~30 percent.

This has been an issue since 11.04 for me on both my Intel i915 and
Nvidia machines (had an 8600 GT and upgraded to 560 GTX, both having the
same issue). However, the nvidia machine is where it really hurts,
_always_ happening within a day or two, while the i915 machine is pretty
reliable overall with certain instances of degradation (used to be
affected just as badly in 11.04).

I will attach two videos demonstrating behavior before and after.
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
CheckboxSubmission: 33c9cec13de798ee31ce4ea2f2cbd4df
CheckboxSystem: 4ed15c40009aa6f7770f606350a390a2
CompizPlugins: [core,detection,composite,opengl,decor,regex,winrules,compiztoolbox,animation,grid,vpswitch,snap,place,gnomecompat,resize,move,mousepoll,imgpng,workarounds,session,expo,wall,fade,scale,unityshell]
DistroCodename: oneiric
DistroRelease: Ubuntu 11.10
DistroVariant: ubuntu
InstallationMedia: Ubuntu 10.10 "Maverick Meerkat" - Release amd64 (20101007)
NonfreeKernelModules: nvidia
Package: compiz 1:0.9.6+bzr20110929-0ubuntu5vv1
PackageArchitecture: all
ProcVersionSignature: Ubuntu 3.0.0-12.20-generic 3.0.4
Tags:  oneiric running-unity oneiric running-unity ubuntu
Uname: Linux 3.0.0-12-generic x86_64
UnreportableReason: This is not a genuine Ubuntu package
UpgradeStatus: Upgraded to oneiric on 2011-10-13 (26 days ago)
UserGroups: adm admin cdrom dialout lpadmin plugdev sambashare

** Affects: compiz (Ubuntu)
     Importance: Undecided
         Status: New

** Tags: apport-collected oneiric running-unity ubuntu

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  Gradual degradation in desktop performance.

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