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Old 04-18-2012, 05:59 PM   #1
jamesual
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Cool Mac RAM usage

Hey all,

I just upgraded my macbook pro (late 2011) model from 4gb to 8gb ram to have wiggle room to run more applications at once. Before the upgrade I ran iTunes, safari, calendar, mail, geektool, nocturne, and istat and after a few hours of regular use would be using about 70% (2.8gb) ram usage. After my upgrade using only the same programs for a few hours I'm right back up at around 70& ram usage (5.6gb or so). Does osx lion just let programs like safari and iTunes utilize ram more because its there?

-Jamesual
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Old 04-19-2012, 04:38 AM   #2
agentx
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Yes, dynamic memory management.
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Old 04-19-2012, 05:02 AM   #3
benwiggy
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There's no point paying for that memory if you're not going to use it!

But generally: yes, the OS will use as much RAM as is available.
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Old 04-19-2012, 06:33 AM   #4
SirDice
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Unused memory is wasted memory.

Most of it will be used as a filesystem cache and application cache. If an application is closed it's memory isn't released immediately. If the application is started again most of it is still in memory and doesn't need to be loaded. This speeds up responsiveness and general usability.
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