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I'm trying to figure out the meanings of all the different classifications of memory such as VIRT, RES, SHR, AND DATA. While I generally understand the first 3, I have no idea what the DATA column means other than it's official definition as DATA = Data+Stack size (kb). How does this relate to the other 3 classifications of memory?

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1 Answer 1

From the man pages:

 s: DATA  --  Data+Stack size (kb)
 The amount of physical memory devoted to other than executable code, also known  as
 the ’data resident set’ size or DRS.

In other words memory used to store variable data of for your programs (not executable programs)

Say like and Array in memory is variable data.

Also stack size is like the words say, the size of your stack that the system is using to execute the particular program. The stack is where the system stores the traceback of functions that your program/process is calling. Keep in mind that this metric says the stack size and not the stack itself.

More on the other memory columns that you mentioned here

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