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  1. #1

    Member Since
    Sep 14, 2009
    Activity Monitor - what does it measure
    Just interested but I have opened activity monitor and its on my toolbar. Could anyone explain what is meant by private memory/real memory/shared/virtual private and virtual.Thanks steve

  2. #2

    cwa107's Avatar
    Member Since
    Dec 20, 2006
    Lake Mary, Florida
    15" MBP, Core i7/2GHz, 8GB RAM, 480GB Crucial M500 SSD
    Liquid and computers don't mix. It might seem simple, but we see an incredible amount of people post here about spills. Keep drinks and other liquids away from your expensive electronics!

  3. #3

    hughvane's Avatar
    Member Since
    May 18, 2008
    Amberley, Canterbury, New Zealand
    MacMini 4.1, OS 10.11 and 10.6; Macbook Pro 8.2, OS 10.12, MacBook 4.1, OS 10.6.8
    Not sure about "private memory" or "shared" or "virtual private" (but then I'm using OS 10.3.9 - Panther).
    Real memory is exactly that, the portion of physical RAM being used by any one of the activities listed in the window.
    Virtual memory is the amount of RAM being allocated to the OS - by the OS - from your hard drive, thus keeping physical RAM use within boundaries (and preventing overload, with subsequent crashes and kernel panics).

    It's a fascinating exercise watching the progress of Activity as more or less is used by the OS. For example, since I started typing this response, AppleSpell kicked into action, showing me spelling or typing errors, and unknown words, within this text.

  4. #4

    Member Since
    Sep 13, 2009
    2 GHz MacBook '07, 1.83 GHz Mac Mini '06, 700MHz Emac 2003, 400MHz Imac 2001
    Activity monitor measures the amount of CPU potential you're using, the RAM you and the system are using, time reactions between the computer and hardware. It takes a little time to figure it all out. If you're impatient, download the iStat or iStat nano widget from the widget downloads center.

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