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  1. #1

    Member Since
    Nov 22, 2006
    Deciphering Activity Monitor
    Hi all,

    I'm looking at my System Memory under Activity Monitor, and was wondering what "Wired," "Active," "Inactive," "Used" and "Free" means. Some are pretty self explanatory I suppose, but I'm kind of confused as to what "Wired" means and the difference between "Inactive" and "Free"


  2. #2

    Member Since
    Nov 29, 2006
    Pittsburgh, PA
    iMac Core Duo 17'' 1.83 ghz 512 mb ram
    - Wired: Memory an application or OS requests to be "pinned" or Never swapped out for any reason. You might use this area for interprocess communication or internal system tables, maybe the swap tables.
    - Active memory, normal memory that qualifies the parameters of the LRU( least recently used algorithm ). Recently accessed memory is keept on board, memory that ages by not being accessed has a LRU number and will eventually move to the INACTIVE catagory.
    - Inactive, ready to be swapped out if necessary.
    - Free, in 10.3 Apple seems to have keept open 200 meg of free memory. In 10.4 Apple seems to have bumped that up to 300 meg.

    from here

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