In Mavericks, the Activity Monitor has changed its memory terminology. The columns available when viewing processes in the memory tab now include "Memory", "Real Memory", "Real Private Memory", "Real Shared Memory" and "Purgeable Memory".
I would have thought that since "Virtual Memory" has disappeared and "Memory" has appeared that they are equivalent, however that doesn't seem to add up because shouldn't then "Memory" be always greater than or equal to "Real Memory"? (If I'm interpreting the terminology correctly, Real Memory is the number of pages currently resident in RAM, and Virtual memory is the number of pages total, including those swapped out to disk, compressed, etc....) However in Activity monitor, "Memory" is always less than "Real Memory". Can anyone explain what this mysterious "Memory" metric is?