1
GATE CSE 2024 Set 2
Numerical
+2
-0.66

Consider a 32-bit system with 4 KB page size and page table entries of size 4 bytes each. Assume 1 KB = $2^{10}$ bytes. The OS uses a 2-level page table for memory management, with the page table containing an outer page directory and an inner page table. The OS allocates a page for the outer page directory upon process creation. The OS uses demand paging when allocating memory for the inner page table, i.e., a page of the inner page table is allocated only if it contains at least one valid page table entry.

An active process in this system accesses 2000 unique pages during its execution, and none of the pages are swapped out to disk. After it completes the page accesses, let $X$ denote the minimum and $Y$ denote the maximum number of pages across the two levels of the page table of the process.

The value of $X+Y$ is __________.

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2
GATE CSE 2024 Set 1
Numerical
+2
-0.66

Consider a memory management system that uses a page size of 2 KB. Assume that both the physical and virtual addresses start from 0. Assume that the pages 0, 1, 2, and 3 are stored in the page frames 1, 3, 2, and 0, respectively. The physical address (in decimal format) corresponding to the virtual address 2500 (in decimal format) is ________

Your input ____
3
GATE CSE 2021 Set 1
MCQ (More than One Correct Answer)
+2
-0.67
In the context operating systems, which of the following statements is/are correct with respect to paging?
A
Paging incurs memory overheads.
B
Paging helps solve the issue of external fragmentation.
C
Page size has no impact on internal fragmentation.
D
Multi-level paging is necessary to support pages of different sizes.
4
GATE CSE 2020
Numerical
+2
-0.67
Consider a paging system that uses a 1-level page table residing in main memory and a TLB for address translation. Each main memory access takes 100 ns and TLB lookup takes 20 ns. Each page transfer to/from the disk takes 5000 ns. Assume that the TLB hit ratio is 95%, page fault rate is 10%. Assume that for 20% of the total page faults, a dirty page has to be written back to disk before the required page is read in from disk. TLB update time is negligible. The average memory access time in ns (round off to 1 decimal places) is ______.
Your input ____
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