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Consider a machine with 64 MB physical memory and a 32-bit virtual address space. If the page size is 4KB, what is the approximate size of the page table?
- a)16 MB
- b)8 MB
- c)2 MB
- d)24 MB
Correct answer is option 'C'. Can you explain this answer?
Most Upvoted Answer
Consider a machine with 64 MB physical memory and a 32-bit virtual add...
Solution:
Given, physical memory = 64 MB
Virtual address space = 32-bit
Page size = 4 KB
To calculate the page table size, we need to find the number of page table entries.
Number of page table entries = Virtual address space/Page size
= 2^32/2^12
= 2^20
Each page table entry requires 4 bytes (32 bits) for the page frame number.
Therefore, the size of the page table = Number of page table entries x size of each entry
= 2^20 x 4 bytes
= 4 MB
However, this is the size of the page table assuming that each entry takes 4 bytes. In reality, each entry may require additional bits for flags, protection bits, etc. Hence, the actual size of the page table may be slightly larger than 4 MB.
Therefore, the approximate size of the page table is 2 MB (option C).
Given, physical memory = 64 MB
Virtual address space = 32-bit
Page size = 4 KB
To calculate the page table size, we need to find the number of page table entries.
Number of page table entries = Virtual address space/Page size
= 2^32/2^12
= 2^20
Each page table entry requires 4 bytes (32 bits) for the page frame number.
Therefore, the size of the page table = Number of page table entries x size of each entry
= 2^20 x 4 bytes
= 4 MB
However, this is the size of the page table assuming that each entry takes 4 bytes. In reality, each entry may require additional bits for flags, protection bits, etc. Hence, the actual size of the page table may be slightly larger than 4 MB.
Therefore, the approximate size of the page table is 2 MB (option C).
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Consider a machine with 64 MB physical memory and a 32-bit virtual add...
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Consider a machine with 64 MB physical memory and a 32-bit virtual address space. If the page size is 4KB, what is the approximate size of the page table?a)16 MBb)8 MBc)2 MBd)24 MBCorrect answer is option 'C'. Can you explain this answer?
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