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What is in wired memory?

Recently I bought a MacBook Pro Core i5 with 4GB Memory (RAM).

After using Xcode and quitting it, all of my memory is committed and I have only 100 MB of free RAM.

So I closed all of my remaining apps, but RAM usage is still high and I don't had much free memory.

What's happening? And what is the meaning of Wired in system memory?

merged by bmike Dec 3 '12 at 17:58

This question was merged with What is wired memory? because it is an exact duplicate of that question.

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