![]() ![]() Active: Programs are really using this memory now or in the last few seconds.Wired: The system cannot run without this amount of RAM (never swapped).Here's how I explained things to someone new to the concept of virtual memory on OS X: It should have been called something like "make your Mac really fast the second, third, and fourth time it does the same task" memory except that's an awful name, too.Īpple re-wrote the activity monitor when it introduced several new features and added compressed memory, so some of this no longer applies to macOS that don’t show “Inactive Memory” but this still applies to Mac OS X memory management as documented against this version of Activity Monitor: ![]() Inactive memory got a horrible rap due to a crappy name.
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