Public bug reported: Since upgrading from 11.04 to 11.10, I've noticed incredibly poor performance with Compiz and progress bars. For example, I just attempted a network copy of a directory of files (10's of them). My computer ground to a halt while the copy went, but as soon as I minimized the progress bar things improved dramatically.
Curious, I peeked at `strace` and noticed it is spinning on reading from a UNIX socket, receiving several EAGAIN's for each successful read. If I maximize the progress bar, there are additional reads (some successful, some EAGAIN) as well as poll() and sched_yield() calls. This behavior is consistently reproducible and results in a 10% increase in CPU load by compiz when the progress bar is maximized. I will attach the two straces as well as a lsof. Opening them side-by- side with a difftool such as meld clearly shows the additional system calls being made when the window is maximized (which is when my system effectively became uselessly slow). ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: unity 4.24.0-0ubuntu2b1 ProcVersionSignature: Ubuntu 3.0.0-12.20-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: 1.23-0ubuntu3 Architecture: amd64 CompizPlugins: [core,bailer,detection,composite,opengl,compiztoolbox,decor,place,session,snap,gnomecompat,regex,move,mousepoll,animation,wall,fade,grid,vpswitch,resize,imgpng,scale,workarounds,expo,ezoom,unitymtgrabhandles,unityshell] CompositorRunning: compiz CurrentDmesg: [ 26.978072] ADDRCONF(NETDEV_CHANGE): eth0: link becomes ready [ 27.754662] EXT4-fs (sdc1): re-mounted. Opts: errors=remount-ro,commit=0 [ 28.235217] init: plymouth-stop pre-start process (1330) terminated with status 1 [ 33.734637] EXT4-fs (sdc1): re-mounted. Opts: errors=remount-ro,commit=0 [ 37.144030] eth0: no IPv6 routers present Date: Mon Oct 31 21:24:39 2011 DistUpgraded: Log time: 2011-10-13 21:06:09.956598 DistroCodename: oneiric DistroVariant: ubuntu DkmsStatus: nvidia-173, 173.14.30, 2.6.38-11-generic, x86_64: installed nvidia-173, 173.14.30, 3.0.0-12-generic, x86_64: installed nvidia-current, 280.13, 2.6.38-11-generic, x86_64: installed nvidia-current, 280.13, 3.0.0-12-generic, x86_64: installed ExecutablePath: /usr/bin/compiz GraphicsCard: nVidia Corporation G80 [GeForce 8800 GTX] [10de:0191] (rev a2) (prog-if 00 [VGA controller]) Subsystem: Giga-byte Technology Device [1458:3439] InstallationMedia: Ubuntu 11.04 "Natty Narwhal" - Release amd64 (20110427.1) MachineType: Gigabyte Technology Co., Ltd. EP45-DQ6 ProcEnviron: LANGUAGE=en_ZA:en PATH=(custom, no user) LANG=en_ZA.UTF-8 SHELL=/bin/bash ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.0.0-12-generic root=UUID=6269bff0-61a9-4445-8224-e7e8db733842 ro quiet splash vt.handoff=7 SourcePackage: unity UpgradeStatus: Upgraded to oneiric on 2011-10-14 (17 days ago) dmi.bios.date: 09/30/2008 dmi.bios.vendor: Award Software International, Inc. dmi.bios.version: F12 dmi.board.name: EP45-DQ6 dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.type: 3 dmi.chassis.vendor: Gigabyte Technology Co., Ltd. dmi.modalias: dmi:bvnAwardSoftwareInternational,Inc.:bvrF12:bd09/30/2008:svnGigabyteTechnologyCo.,Ltd.:pnEP45-DQ6:pvr:rvnGigabyteTechnologyCo.,Ltd.:rnEP45-DQ6:rvrx.x:cvnGigabyteTechnologyCo.,Ltd.:ct3:cvr: dmi.product.name: EP45-DQ6 dmi.sys.vendor: Gigabyte Technology Co., Ltd. version.compiz: compiz 1:0.9.6+bzr20110929-0ubuntu5 version.ia32-libs: ia32-libs 20090808ubuntu26 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 ** Affects: compiz (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug compiz-0.9 oneiric running-unity ubuntu -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/884387 Title: Compiz is absurdly heavy on CPU To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/884387/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs