CPU System Leak after upgrading to 10.10.4

Discussion in 'OS X Yosemite (10.10)' started by tgd85, Jul 6, 2015.

  1. tgd85 macrumors member

    Joined:
    Sep 18, 2013
    #1
    Currently my CPU is running 13% when completely idol. System % is constantly in the range of 12-14%. But I can't find the leak. Nothing in Activity Monitor shows high system CPU usage. How can I find out what's causing the leak?

    Edit: kernal_task is showing 65% CPU usage. What's going on here?
     
  2. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #2
    Which is normal if you just upgrade your system to 10.10.4. Unless the kernal_task stuck at 99%, then may be something wrong.
     
  3. tgd85 thread starter macrumors member

    Joined:
    Sep 18, 2013
    #3
    Thanks for the advice. After a few shutdown / restart cycles, it seems to be operating again at normal levels.

    Just out of curiosity, why would installing a recent upgrade cause that to happen? I installed the upgrade a few days ago and hadn't noticed anything until my machine literally became hot to the touch.
     
  4. tgd85 thread starter macrumors member

    Joined:
    Sep 18, 2013
    #4
    I'm still experiencing this issue. High system CPU usage starts immediately after booting from shutdown. Always between 12- 15% kernal_task. The issue persists over several shutdown / restarts. After a few cycles, it disappears for that particular boot, but then reappears upon rebooting.

    Any ideas?
     
  5. h9826790 macrumors 604

    h9826790

    Joined:
    Apr 3, 2014
    Location:
    Hong Kong
    #5
    I will say 12- 15% kernal_task is normal. Not really high CPU usage. Some system background activity (e.g. indexing, Time machine, etc) may cause this kind of CPU usage (or higher).

    Just 12-15% of a core, really nothing to worry about. You better let the OS handle itself rather than disturb it.
     
  6. tgd85 thread starter macrumors member

    Joined:
    Sep 18, 2013
    #6
    My fault for not explaining more. These are the readouts from Activity Monitor.

    kernal_task CPU = 66.5% CPU Time = 8:04 Threads = 107 Idle Wakeups = 55,135

    The 13% I was referring to was the total System %. (quad core machine)

    After about 15 reboots, it's finally back down to 2.4% or 0.5% of total System. I'm terrified to reboot my machine again...
     
  7. ScoobyMcDoo macrumors 65816

    Joined:
    Nov 26, 2007
    Location:
    Austin, TX
    #7
    You should be able to patch it right up with some JBWeld.

    Seriously, you are chasing a non-issue. If it is showing high CPU utilization, that means it has something it needs to get done.
     
  8. tampageek macrumors 6502

    tampageek

    Joined:
    Jul 1, 2015
    Location:
    Florida, USA
    #8
    I have been going nuts with this issue since upgrading to 10.10.4. Today I finally bit the bullet and did a clean install with a bootable USB I made. Problem solved - and my battery draining issues also solved. I had no idea how smooth Yosemite could be.

    Clean install solves all- at least for me it did.
     
  9. tgd85 thread starter macrumors member

    Joined:
    Sep 18, 2013
    #9
    I'm hoping to avoid that fate if possible, but it's good to know that did the trick. There are a few posts from others who are experiencing a similar issue over at the Apple Support forums.

    I wasn't having any issues prior to the recent update. Were you able to restore from a backup after the clean install?
     
  10. tampageek macrumors 6502

    tampageek

    Joined:
    Jul 1, 2015
    Location:
    Florida, USA
    #10
    Actually...no. All my backup drives (3 separate ones) would only allow me to access "today" even though it showed there were dozens there. I think this may have to do with the firmware update and Apple's gradual push (as in OS X 10.11 SIP) to block everyone (but them) from access to the hard drive. This also hinders the users the ability to roll back the OS to a stable version.

    Fortunately I keep copies of photos and important files on thumb drives so I was able to restore them individually. Pain the butt but it worked.

    So Upgrader's beware - and make ordinary copies of your files because the time machine backup to the previous OS may NOT work!
     

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