Virtual Memory Organisation Questions and Answers

Q: Which type of memory allows computer system to execute computer programs requiring more memory than physically available ?

The memory is virtual memory.Virtual memory gives each program an address space larger than physical memory. Pages are kept on disk and brought into main memory when referenced, with the page table mapping virtual to physical addresses, so a program can run even if it does not fit in RAM.Auxiliary memory is the disk storage itself, associative memory is content-addressable memory used for lookups such as the TLB, and cache memory speeds up access but does not enlarge the address space.

Q: A CPU generates 32-bit virtual addresses. The page size in 4KB. The processor has a translation look-aside Buffer (TLB) which can hold a total of 128 pages table entries and is 4-way set associative. The maximum size of the TLB tag is :

The maximum TLB tag size is 15 bits.Work out the virtual page number, then the bits used to index the TLB sets:\[ \begin{aligned} \text{offset} &= \log_{2} 4096 = 12 \text{ bits} \\ \text{page number} &= 32 - 12 = 20 \text{ bits} \\ \text{sets} &= 128 / 4 = 32 = 2^{5} \\ \text{tag} &= 20 - 5 = 15 \text{ bits} \end{aligned} \]20 bits would be the tag of a fully associative TLB, where the whole page number is compared. 11 and 13 bits come from subtracting the wrong number of index bits.

Which type of memory allows computer system to execute computer programs requiring more memory than physically available ?

A.Auxiliary Memory
B.Associative Memory
C.Cache Memory
D.Virtual Memory

Exam Year(s)

MH SET - 2024, SET Exam - 2024,

Answer: D

The memory is virtual memory.

Virtual memory gives each program an address space larger than physical memory. Pages are kept on disk and brought into main memory when referenced, with the page table mapping virtual to physical addresses, so a program can run even if it does not fit in RAM.

Auxiliary memory is the disk storage itself, associative memory is content-addressable memory used for lookups such as the TLB, and cache memory speeds up access but does not enlarge the address space.

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A CPU generates 32-bit virtual addresses. The page size in 4KB. The processor has a translation look-aside Buffer (TLB) which can hold a total of 128 pages table entries and is 4-way set associative. The maximum size of the TLB tag is :

A.11 bits
B.13 bits
C.15 bits
D.20 bits

Exam Year(s)

MH SET - 2025, SET Exam - 2025,

Answer: C

The maximum TLB tag size is 15 bits.

Work out the virtual page number, then the bits used to index the TLB sets:

\[ \begin{aligned} \text{offset} &= \log_{2} 4096 = 12 \text{ bits} \\ \text{page number} &= 32 - 12 = 20 \text{ bits} \\ \text{sets} &= 128 / 4 = 32 = 2^{5} \\ \text{tag} &= 20 - 5 = 15 \text{ bits} \end{aligned} \]

20 bits would be the tag of a fully associative TLB, where the whole page number is compared. 11 and 13 bits come from subtracting the wrong number of index bits.

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Virtual Memory Organisation Questions and Answers

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