Shawn Erickson wrote:

The OS maintains a cache of data in RAM as much as it can while
running. This "universal buffer cache" caches pages of data from
loaded files, applications, etc.


With Xcode dev tools installed, a 'purge' command is added. It will purge this cache, making it easier to test.

If Activity Monitor.app is running, you'll see the change in its System Memory pane.

  -- GG

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