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Thread: High CPU usage with KDE 4.3.3

  1. #1
    olejacob NNTP User

    Question High CPU usage with KDE 4.3.3

    This question has been asked before, but I have not found a definite answer.

    On my openSUSE 11.1 box with KDE 4.3.3 CPU usage is far to high (Xorg = 30-40%) when doing simple things like just moving a window. I have desktop effects on. When I turn them off desktop effects CPU usage drops down to nearly nothing. In addition to the high CPU usage the interactive response also becomes bad after a few minutes of use (when desktop effects are on). Clicking the start menu takes 1-2 seconds to open the menu.

    I have a dual core Dell Inspiron 390 with a nVidia Geforce gt9800. Also tested with a quattro FX 3450 with same result.

    I use the following plasmoids: analog clock, calculator, dictionary, digital clock, microblogging, picture frame, stock quote, system monitor (CPU), system monitor (network).

    Note that plasma doesn't use to much CPU.

    So is this something I have to live with? Is it a problem specific to openSUSE (which has been suggested some places)? Will it be fixed in openSUSE 11.2?

  2. #2
    google01103 NNTP User

    Default Re: High CPU usage with KDE 4.3.3

    olejacob wrote:

    >
    > This question has been asked before, but I have

    not found a definite
    > answer.
    >
    > On my openSUSE 11.1 box with KDE 4.3.3 CPU

    usage is far to high (Xorg
    > = 30-40%) when doing simple things like just

    moving a window. I have
    > desktop effects on. When I turn them off

    desktop effects CPU usage
    > drops down to nearly nothing. In addition to

    the high CPU usage the
    > interactive response also becomes bad after a

    few minutes of use (when
    > desktop effects are on). Clicking the start

    menu takes 1-2 seconds to
    > open the menu.
    >
    > I have a dual core Dell Inspiron 390 with a

    nVidia Geforce gt9800.
    > Also tested with a quattro FX 3450 with same

    result.
    >
    > I use the following plasmoids: analog clock,

    calculator, dictionary,
    > digital clock, microblogging, picture frame,

    stock quote, system
    > monitor (CPU), system monitor (network).
    >
    > Note that plasma doesn't use to much CPU.
    >
    > So is this something I have to live with? Is it

    a problem specific to
    > openSUSE (which has been suggested some

    places)? Will it be fixed in
    > openSUSE 11.2?
    >
    >

    4.3.3 definitely higher than either 4.3.2 and the
    4.3.3 beta's, did you see this in kde4.2. I see
    higher usage but not like you're seeing.

    Suggestion - when I upped to 4.3.3 I had strange
    performance issues with plasma and erasing the rc
    files fixed them, though xorg and kwin still
    higher than before the upgrade.
    --
    openSuse 11.1 x64bit, KDE4.x Factory, Opera
    weekly

  3. #3
    Join Date
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    Default Re: High CPU usage with KDE 4.3.3

    I'm not sure if the number of plasmoids you have is the problem (they seem rather a lot, all I keep normally is the weather widget), but it certainly seems that you could try removing some of those plasmoids.
    On my Fedora box with KDE 4.3.1, with most KWin effects enabled, nine plasmoids for the sake of testing, three programs running, a total of 144 processes, and a Pentium D with 1.5 GB RAM, the CPU usage amounts only to 20% or less when normally working, and around 40% or more when I'm deliberately taxing out the system.
    The number of plasmoids, although they seem high to me, are not a problem on my system... Maybe for some reason they are a problem on your system. Try removing some unneeded ones.
    The second possibility is that this is an openSUSE 11.1-specific problem, a bug or something... Or some other technical problem with your configuration. I can't much help you with that, sorry. Try openSUSE 11.2 when it comes out (only 4 days left), and see if the problem is fixed there.
    Because Fedora with KDE functions well with some programs running and nine widgets on the desktop, all I can suggest is to remove some widgets and see if that does the job (Don't disable KWin altogether), in case the high number of plasmoids is too heavy a load on your openSUSE system.

    Hope that helped.
    "Darkness called But I was on the phone, so I missed him. I tried to *69 Darkness, but his machine picked up. I yelled "Pick up the phone, Darkness!," but he ignored me. Darkness must have been screening his calls."

  4. #4

    Default Re: High CPU usage with KDE 4.3.3

    Ok, I am even worse, It starts with 20 or 30% CPU at first, but now after I let the computer run over the weekend it now reaches 98% CPU and 81% (1.6 Gb virtual) memory according to top. Just to top it off, I get two crashes on KDE startup: plasma and krunner. And when the desktop shows up, all system tray icons are stacked one on top of the other, the clock widget isn't working and Alt+F2 is not available...

  5. #5
    Join Date
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    Default Re: High CPU usage with KDE 4.3.3

    What you could do is take a screenshot of top when it's running high like that. Then post it here for us to look at.
    Leap 15.1_KDE
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  6. #6

    Default Re: High CPU usage with KDE 4.3.3

    How do I attach a snapshot in the forum. Can't seem to be able to upload, it's asking for an url.

  7. #7

    Default Re: High CPU usage with KDE 4.3.3

    Quote Originally Posted by kgeorgokitsos View Post
    How do I attach a snapshot in the forum. Can't seem to be able to upload, it's asking for an url.
    Now I see why: I may not post attachments. So, what do I do?

  8. #8
    Join Date
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    Default Re: High CPU usage with KDE 4.3.3

    Upload the picture to a hosting service like imagebam.com
    Then copy the direct link here
    Leap 15.1_KDE
    My Articles Was I any help? If yes: Click the star below

  9. #9

    Default Re: High CPU usage with KDE 4.3.3

    Here we go:

  10. #10
    mangili NNTP User

    Default Re: High CPU usage with KDE 4.3.3

    I would like to report a similar problem,
    but seen only on one of two very similar
    systems (at SW side), just as a complement
    of info: 'disabling compositing effects'
    (Alt+Shift+F12) nor 'disabling desktop
    effects' does not help at all.


    SYSTEM with problems
    --------------------

    CPU: Intel(R) Core(TM)2 Duo CPU E8200
    Total memory (RAM): 3.8 GB

    OS: Linux 2.6.27.37-0.1-pae i686
    System: openSUSE 11.1 (i586)
    KDE: 4.3.3 (KDE 4.3.3) "release 1"

    Vendor: NVIDIA Corporation
    Model: GeForce 8600 GT/PCI/SSE2
    Driver: 3.2.0 NVIDIA 190.42


    Summary of top:
    top - load average: 1.88, 1.95, 1.91
    Tasks: 147 total, 3 running, 144 sleeping
    Cpu(s): 37.9%us, 15.4%sy, 0.0%ni, 45.7%id
    Mem: 4026972k total, 1401344k used, 2625628k free
    Swap: 2104472k total, 0k used, 2104472k free

    USER VIRT RES SHR S %CPU %MEM COMMAND
    root 574m 52m 19m R 52 1.3 Xorg
    auser 305m 64m 30m R 48 1.7 plasma-desktop
    auser 77068 17m 13m S 4 0.4 kgpg
    auser 3304 1148 640 S 2 0.0 dbus-daemon
    root 1008 360 308 S 0 0.0 init
    ...


    SYSTEM without problems
    ----------------------

    CPU: Intel(R) Core(TM)2 Extreme CPU Q9300
    Total memory (RAM): 3.9 GB

    OS: Linux 2.6.27.37-0.1-pae i686
    System: openSUSE 11.1 (i586)
    KDE: 4.3.3 (KDE 4.3.3) "release 1"

    Vendor: NVIDIA Corporation
    Model: Quadro FX 3700M/PCI/SSE2
    Driver: 3.2.0 NVIDIA 190.42

    Summary of top:
    top - load average: 0.00, 0.05, 0.07
    Tasks: 146 total, 1 running
    Cpu(s): 0.6%us, 0.6%sy, 0.2%ni, 97.8%id
    Mem: 4089648k total, 1204256k used, 2885392k free
    Swap:2104472k total, 0k used, 2104472k free

    USER VIRT RES SHR S %CPU %MEM COMMAND
    root 1008 364 312 S 0 0.0 init
    root 0 0 0 S 0 0.0 kthreadd
    root 0 0 0 S 0 0.0 migration/0
    ...

    Hope it can help spotting the issue...

    Sincerely

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