Question

The memory management scheme that permits the physical address space of a process to non-contiguous space is called
1. Paging
2. Spooling
3. Swapping
4. None of the above

Answer 1

Correct Answer - Option 1 : Paging

The correct answer is Paging.

• Paging
  • Paging is a memory management scheme by which a computer stores and retrieves data from secondary storage for use in the main memory.
  • In this scheme, the operating system retrieves data from secondary storage in same-size blocks called pages.
  • Paging is an important part of virtual memory implementations in modern operating systems, using secondary storage to let programs exceed the size of available physical memory.

• Swapping
  • The medium-term scheduler reduces the degree of multiprogramming. Some processes are removed from memory to reduce multiprogramming. Later, the process can be reintroduced into memory, and its execution can be continued where it left off. This scheme is called swapping.
  • The long-term scheduler, or job scheduler, selects processes from a mass-storage device and loads them into memory for execution.
  • The short-term scheduler, or CPU scheduler, selects from among the processes that are ready to execute and allocates the CPU to one of them.