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Thread: 4 CPUs?

  1. #1
    Join Date
    Feb 2012
    Beans
    14

    4 CPUs?

    I have a dual-core Core i3 on my laptop, and System Monitor gives usage statistics for 4 different "CPUs". I'm assuming that the 4 CPUs the OS recognizes are actually the cores in the processor, and the 4 "CPUs" are due to the hyperthreading, which I understand creates a virtual core for every physical core. Is this correct?

    Is there a reason why different CPUs receive different usage rates at a given time? 1 and 3 seem to be the most active while the system idles, followed by 2 and 4.

  2. #2
    Join Date
    May 2007
    Location
    S. E. Arizona, USA
    Beans
    Hidden!
    Distro
    Ubuntu 10.10 Maverick Meerkat

    Re: 4 CPUs?

    Yes you are correct. Each physical core is equipped with the Hyperthreading to simulate a second core. My I7 shows 8 processors, which really means there are 4 cores, each with Hyperthreading. Little software currently support 4 cores, but some Linux software really does exercise all 4 plus the HT as well.
    // Don
    ---------------------------------------------------
    Toshiba P755-S5390 / Core I7 / 8 gigs

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