Quiz #9 Review: Virtual Memory and Paging

Flashcards based on Quiz #9 covering concepts of demand paging, virtual memory advantages, and page replacement algorithms including FIFO, LRU, and OPT.

What must happen to the instruction that causes a page fault after the fault has been handled?

The instruction needs to be re-executed.

What does Copy-On-Write (COW) initially allow a parent and child process to do?

It initially allows them to share the same pages.

In demand paging, when is a page loaded into memory?

A page is loaded in memory only when it is needed during execution.

What are the primary advantages of virtual memory?

Programs can be larger than physical memory; programmers can concentrate on the problem instead of memory availability; and programs can be executed while only partially loaded in memory.

What is the purpose of the dirty (modify) bit?

It identifies a page that has been modified since it was loaded.

What is the primary use of the optimal page replacement algorithm?

It is used mostly for comparison with other page-replacement schemes.

What is the number of page faults using the FIFO replacement algorithm for the reference string 1 2 3 4 2 3 4 1 2 1 1 3 1 4 with three frames?

8

What is the final configuration of the three frames following the execution of the reference string 1 2 3 4 2 3 4 1 2 1 1 3 1 4 using the FIFO replacement algorithm?

3, 4, 2

What is the final configuration of three page frames after applying the OPT algorithm to the reference string 1 2 3 4 2 3 4 1 2 1 1 3 1 3?

1, 2, 3

What is the final configuration of the three frames after applying the LRU algorithm to the reference string 1 2 3 4 2 3 4 1 2 1 1 3 1 4?

3, 1, 4