kernal_task using all CPU on iMac

Discussion in 'macOS Sierra (10.12)' started by FuzzyRaichu, Feb 2, 2017.

  1. FuzzyRaichu macrumors newbie

    Feb 2, 2017
    So every since updating to Sierra, my iMac has been spending all of the CPU power on kernal_task, and it's been making the whole machine run slow and the fan run obnoxiously loud.

    We tried reinstalling with recovery mode, and it worked... for about a day, and then went back to slow computer and loud fan. What can be done to fix this?
  2. gsahli macrumors 6502a


    Jun 1, 2007
    I think you'll need to do a more in-depth analysis. kernel_task is a scheduler of others, so it's always in the top 5 on my mini (but not a high percent of CPU). Try etrecheck.
  3. FuzzyRaichu thread starter macrumors newbie

    Feb 2, 2017
    So etrecheck printed out this:

    Top Processes by CPU: <etrecheck://help/cpu> ⓘ <etrecheck://help/cpu>

    28% mds

    21% mds_stores

    8% WindowServer

    3% Adobe CEF Helper(2)

    2% kernel_task

    Which seems weird, because, again, kernel_task is (according to Activity Monitor) taking up 250-300%.
  4. Weaselboy Moderator


    Staff Member

    Jan 23, 2005
    This is Spotlight indexing. Did you just add a bunch of files that need indexing?

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3 February 2, 2017