1
GATE CSE 2012
MCQ (Single Correct Answer)
+2
-0.6
Consider the virtual page reference string $$$1,2,3,2,4,1,3,2,4,1$$$
On a demand paged virtual memory system running on a computer system that has main memory size of $$3$$ page frames which are initially empty. Let $$LRU,$$ $$FIFO$$ and $$OPTIMAL$$ denote the number of page faults under the corresponding page replacement policy. Then
A
$$OPTIMAL < LRU < FIFO$$
B
$$OPTIMAL < FIFO < LRU$$
C
$$OPTIMAL = LRU$$
D
$$OPTIMAL = FIFO$$
2
GATE CSE 2009
MCQ (Single Correct Answer)
+2
-0.6
Consider the virtual page reference string $$$1,2,3,2,4,1,3,2,4,1$$$
On a demand paged virtual memory system running on a computer system that has main memory size of $$3$$ page frames which are initially empty. Let $$LRU,$$ $$FIFO$$ and $$OPTIMAL$$ denote the number of page faults under the corresponding page replacement policy. Then
A
$$OPTIMAL < LRU < FIFO$$
B
$$OPTIMAL < FIFO < LRU$$
C
$$OPTIMAL = LRU$$
D
$$OPTIMAL = FIFO$$
3
GATE CSE 2009
MCQ (Single Correct Answer)
+2
-0.6
A multilevel page table is preferred in comparison to a single level page table for translating virtual address to physical address because.
A
It reduces the memory access time to read or write a memory location.
B
It helps to reduce the size of page table needed to implement the virtual address space of a process.
C
It is required by the translation look aside buffer.
D
It helps to reduce the number of page faults in page replacement algorithms.
4
GATE CSE 2008
MCQ (Single Correct Answer)
+2
-0.6
A processor uses 36 bit physical addresses and 32 bit virtual addresses, with a page frame size of 4 Kbytes. Each page table entry is of size 4 bytes. A three level page table is used for virtual to physical address translation, where the virtual address is used as follows:
$$ * \,\,\,\,\,\,$$ Bits 30-31 are used to index into the first level page table
$$ * \,\,\,\,\,\,$$ Bits 21-29 are used to index into the second level page table
$$ * \,\,\,\,\,\,$$ Bits 12-20 are used to index into the third level page table, and
$$ * \,\,\,\,\,\,$$ Bits 0-11 are used as offset within the page

The number of bits required for addressing the next level page table (or page frame) in the page table entry of the first, second and third level page tables are respectively

A
20, 20 and 20
B
24, 24 and 24
C
24, 24, and 20
D
25, 25 and 24
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