[VBox] Why VirtualBox process is so large?

[BBlister]

One column is the  VSZ     and the other column is the RSS  .

What you should look at is the RSS column which is the real physical memory
allocated. Thus, if you
configure 512MB and your machine used 444MB RSS memory, then it has not
touched at all a memory portion. Usually the overhead is ~80MB. So, a VM
with 512MB which uses all the memory, will have RSS 512+70 ~600MB . 

Note that the VSZ is the virtual allocated memory, that is the memory that
has been *virtually* allocated, and maybe it has been used or not. This
exists in the virtual memory subsystem. Do not worry about VSZ, all
operating systems have very large ammounts of this memory.

The VSZ memory shows the memory that has originally requested, and the RSS
the memory that has been placed on RAM (from the VSZ). The rest of the VSZ
memory is either on disk, or just some entries in the process table
description structure.






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