13. Address Spaces

Question 1

What is multiprogramming?

Answer 1

It is when multiple processes are loaded into memory and the CPU switches between them when needed. For example, when an I/O request happens.

Question 2

What is the difference between time sharing and multiprogramming?

Answer 2

Time sharing switches automatically between many processes and run each of them for a short period of time.

Multiprogramming switches only when it’s needed, for example I/O request.

Question 3

What is address space

Answer 3

The process view of the memory

Question 4

What is inside of an address space

Answer 4

Code, stack, heap

Question 5

What are the arrangements of the components in an address space

Answer 5

Code (located at the top and does not grow)
Stack (located at the bottom and grows upwards)
Heap (located below the code and grows downwards)

Question 6

What is a virtual address

Answer 6

An abstracted version of the physical address that exists in the process address space

Question 7

What are the goals of a Virtual Memory (VM)?

Answer 7

1. Transparency
2. Efficiency
3. Protection