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vsz virtual memory size Total amount of memory a process may hypothetically access. Includes swapped memory, memory from external libraries and allocated memory that’s not used. rss

Total amount of non-swapped used physical memory. Includes memory from external shared libraries. pss proportional share size Total amount of non-swapped physical memory with shared memory...

Understand all the terms in How Ruby method lookup works, in particular: include extend singleton class prepend Do you understand why object.extend(SomeModule) is the same as object.singleton_class.include...

How does include and extend work together with inheritance? You may also read more about the Ruby Object Model, if all of this is quite confusing to you. Metaprogramming...