Operating System (Virtual Memory)

The set of addresses (parts of process) which are inside the RAM is called __________.

• Principle of Locality

• Virtual Memory

• Virtual Address Space

• Translation Lookaside Buffer

It says that at anytime a process will require only few pages in the memory.

• Principle of Locality

• Virtual Memory

• Virtual Address Space

• Translation Lookaside Buffer

Which of the following are the advantages of virtual memory? (Select two.)

• Degree of multiprogramming is higher.

• Decrease the average memory access time.

• Decrease the effective memory access time.

• Execute even processes whose larger than the size of RAM.

If the page containing the byte w/c the CPU wants to access is present inside the RAM, it is __

• Page fault

• Page hit

• Page miss

• page gain

If page containing the byte w/c the CPU wants to access is not present inside the RAM, it is ___

• Page fault

• Page hit

• Page drop

• page gain

It is the average time taken to access a byte or word from our computer.

• Average Memory Access Time

• RAM Access Time

• Hard disk Access Time

• Mode Memory Access Time

It is a type of cache where few pages of the pagetable are being maintain.

• Translation Lookaside Buffer

• Random Access Memory

• Hard disk

• Register

A paging scheme uses TLB. A TLB access takes 10 ns and main memory access takes 50 ns. What is the effective memory access time (in ns) if the TLB hit ratio is 90% and there is no page fault?

• 54

• 60

• 65

• 75

RAM access time = 1ns

Hard Disk acces time = 1ms

1-level page table

page fault % = 10%

Find the EMAT (in ns).

• 100, 000 ns

• 100, 002 ns

• 100, 004 ns

• 100, 006 ns

RAM access time = 10 ns

Harddisk access time = 1000 ns

9-level paging

page hit % = 90 %

Find the AMAT.

• 125 ns

• 150 ns

• 175 ns

• 200 ns