>100 % cpu

Discussion in 'MacBook Pro' started by mac-collector, Apr 20, 2012.

  1. mac-collector macrumors regular

    mac-collector

    Joined:
    Apr 8, 2012
    Location:
    Europe
    #1
    I sometimes see my % CPU in activity monitor go above 100 % to, lets say, 140 %. What does this number mean? Obviously not total CPU usage. Why is the maximum not 100 %?

    Thanks.
     
  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2
    1 CPU core is 100 %, 2 CPU cores are 200 %, 4 CPU cores are 400 %, 4 cores with 2 threads per core (HyperThreading, having eight virtual cores) gives you 800 % CPU capacity, thus 140 % CPU activity is using at least a dual core CPU.
     
  3. jgz macrumors regular

    jgz

    Joined:
    Mar 4, 2011
    Location:
    suedtirol.italy
    #3
    Interesting, nice to know!

    I always wondered about that, what would it mean, when CPU is >100%...
    Anyway, the only software, which brings the CPU at this, is Skype, don't know why.............. Bad coding probably :)
     
  4. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #4
    Do you video chat? If so, is the CPU activity that high during that activity? If so, then that is because the video has to be compressed* in real time, which is CPU intensive.

    * to make it smaller and faster to upload
     
  5. jgz macrumors regular

    jgz

    Joined:
    Mar 4, 2011
    Location:
    suedtirol.italy
    #5
    no, if I would video-chatting, it would be okay, but most of the times it happens randomly, e.g. when a normal chat window is opened, or generally, when skype is running, doesnt matter, if its minimized or not... The only workaround, which I figured out, is to quit completely skype and restart it... After some time the same thing happens again (estimately once/twice a day - so its not a real pain...)

    even heavy CAD software or PS etc doesnt get the cpu at its limits, like skype sometimes. Funny :)
     
  6. arcite macrumors 6502a

    arcite

    Joined:
    Sep 6, 2009
    Location:
    Cairo, trapped in a pyramid with my iphone
    #6
    Unless the fan is turning on high speed and the bottom of the Macbook is heating up, I wouldn't worry about it. Usually it's flash that causes spikes.
     
  7. Hexiii macrumors 65816

    Hexiii

    Joined:
    Jun 30, 2011
    Location:
    Prague, Czech Republic
    #7
    Or you are maybe from Russia.
     

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