kernel_task - taking up over 200% CPU usage??

Discussion in 'MacBook Pro' started by olletsocmit, Jun 9, 2015.

  1. olletsocmit macrumors 6502

    olletsocmit

    Joined:
    Jun 24, 2010
    Location:
    USA
    #1
    My MBP has been running super slow the last 2-3 days. It is very very lagy! When i just opened activity monitor, I noticed that Kernel_task was running at over 200% CPU usage, it is also running super hot. I am not able to stop this process either, what the heck is going on???

    see below:
    [​IMG]
     
  2. cbautis2 macrumors 6502a

    Joined:
    Aug 17, 2013
  3. olletsocmit thread starter macrumors 6502

    olletsocmit

    Joined:
    Jun 24, 2010
    Location:
    USA
    #3
    Really? thats a real pain in the ass. It came out of no where. there has to be something that changed. dont see how it just happeded out of no where like this.
     
  4. Samuelsan2001 macrumors 603

    Joined:
    Oct 24, 2013
    #4
    Well you could do an SMC and PRAM reset and repair disk first and see how that goes....

    They will often clear an issue this, although it's annoying that you don't know what the issue is afterwards.
     
  5. olletsocmit thread starter macrumors 6502

    olletsocmit

    Joined:
    Jun 24, 2010
    Location:
    USA
    #5
    I just noticed that firefox was just also running at over 100% cpu usage and some other things are close as well. is this normal?
     
  6. simonsi macrumors 601

    simonsi

    Joined:
    Jan 3, 2014
    Location:
    Auckland
    #6
    Have you umm, restarted your Mac? If so does it still occur?
     
  7. olletsocmit thread starter macrumors 6502

    olletsocmit

    Joined:
    Jun 24, 2010
    Location:
    USA
    #7
    haha, yea i have restarted.
     
  8. joe-h2o macrumors 6502a

    Joined:
    Jun 24, 2012
    #8
    Kernel task is the kernel of the OS - it's the main "brain" of the OS so you can't quit it or you'll crash the computer. Everything else in the system depends on it, so if it does crash it's what's called a kernel panic and is why when it happens it's not graceful - the system simply stops and says "restart your computer".

    Very high CPU usage of that task suggests that one of the drivers in the kernel is playing up. The first thing to do after trying a simple reboot is to try and reset the PRAM and SMC (check Apple's support pages for your specific model on how to do this, but it's pretty easy).

    If this doesn't solve it then reinstalling OS X might also help, and/or remove any third party kernel extensions you have installed, if any. Try running the system with no peripherals connected like USB drives, connected printers etc - anything hooked up by USB.

    Your system log might also give some clues about why the kernel is flipping out.

    Edit: high CPU usage on firefox or other browsers is usually plugin related, almost exclusively Flash content. If you have youtube open then expect very high resource usage in Chrome and Firefox due to Flash. It's pretty heavy in Safari too.
     
  9. fab5freddy macrumors 65816

    fab5freddy

    Joined:
    Jan 21, 2007
    Location:
    Heaven or Hell
    #9
    i have the exact same issue. also looking for a solution.
     
  10. olletsocmit thread starter macrumors 6502

    olletsocmit

    Joined:
    Jun 24, 2010
    Location:
    USA
    #10
    you suggested to "remove any third party kernel extensions you have installed" -- what would be an example of a 3rd party extension i may have installed?
     

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