On Mac OS X how can I see how much memory is being used by what programs?


You can use the Activity Monitor application. It is located in /Applications/Utilities/Activity Monitor.app. And here is a screenshot with the columns for memory usage highlighted:Activity Monitor Screenshot

  • 2
    +1 - short, sweet, and correct. Including a screenshot might enhance your answer though! – nhinkle Jan 28 '11 at 5:59
  • @nhinkle: Added the screenshot. Thanks for the suggestion! – Wuffers Jan 28 '11 at 13:43
  • Thanks for suggesting to add the 'Virtual Mem' column. Could you add a short explanation of the differences between the two? – benregn Jul 30 '13 at 14:48

MacOS is a UNIX. Thus, it has lots of standard unix tools, in your case, the top program, which you can execute in a terminal.

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