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Old Nov 15, 2014, 07:54 AM   #51
y-Rex
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I usually surf with multiple tabs open, stream video and maybe have the odd app open. My activity monitor says I'm using 9gb of ram. I'm glad I've updated my memory from 8gb to 16gb. I'm not sure if I need more or I'll ever need more of if more will improve my performance in any way.
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Old Nov 15, 2014, 10:20 AM   #52
talmy
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Quote:
Originally Posted by y-Rex View Post
I usually surf with multiple tabs open, stream video and maybe have the odd app open. My activity monitor says I'm using 9gb of ram. I'm glad I've updated my memory from 8gb to 16gb. I'm not sure if I need more or I'll ever need more of if more will improve my performance in any way.
Note that OS X will attempt to use all the memory you have. Any not needed by the OS or applications will be used for disk caching or as "compressed" to hold applications that are no longer running but can be expanded when needed (faster than disk access). Since the reported Memory Used = App Memory + Wired Memory (which is basically system memory) + File Cache + compressed, that figure should be nearly equal to Physical Memory on any machine. To determine the amount of RAM you are actually using, add App Memory to Wired Memory. Examples:

1. Server computer which has been running 25 days shows that 7.99 out of 8.00 GB RAM used, however only 4.53 GB is actually in use. Never swapped (which is generally bad for performance).
2. My iMac shows 7.6 of 8 GB RAM used, but only 4.87 is in actual use. It's currently running Safari, Screen Sharing, Skitch, Mail, Activity Monitor, CrashPlan, ScanSnap, Text Expander, DropBox, Hazel, Alfred, BetterTouchTool, ShouldISleep, and DragonDrop.
3. Entertainment Center shows 3.81 of 4.00 GB used but is only using 1.92 GB. At some time in the past swapping occurred (it's been up 28 days).

Notice that the "Memory Pressure" of all three systems is in the Green.
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