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Quiz on Paging and Memory Allocation

Test your knowledge on paging, memory allocation, and segmentation with this quiz. Answer questions about page division, memory accesses, inverted page tables, internal fragmentation, and more.

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Quiz on Paging and Memory Allocation

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  1. Quiz 3 CS 143A

  2. 5. In paging, physical memory is divided into pages. • True • False 6. In paging, how many memory accesses are required for each data/instruction access? Assume no TLB. • 1 • 2 • 3 • 4 7. An inverted page table has one entry for each real page of memory. • True • False 8. Segmented paged memory overcomes the internal fragmentation problem of segmented memory. • True • False 9. What happens when the segment number > segment-table length register? • The segment is grown to accommodate the request • Fragmentation • The process is swapped out • Segmentation fault 1. Which dynamic storage allocation strategy produces the largest leftover hole: • First-fit • Best-fit • Worst-fit • None of the above 2. External fragmentation is when not enough memory space exists to satisfy a request due to each allocation being larger than necessary. • True • False 3. An invalid bit means which of the following: • The page is swapped out • The page is not in the process’s logical address space • The page is not in the process’s physical address space • The page has not been allocated 4. If a 32-bit machine has a 4K page size, which of the following are valid sizes (in bits) for the page number, offset of the logical address: • 20, 12 • 22, 10 • 16, 16 • a & c • None of the above

  3. Quiz 3 – SOLUTIONS CS 143A

  4. 5. In paging, physical memory is divided into pages. • True • False 6. In paging, how many memory accesses are required for each data/instruction access? Assume no TLB. • 1 • 2 • 3 • 4 7. An inverted page table has one entry for each real page of memory. • True • False 8. Segmented paged memory overcomes the internal fragmentation problem of segmented memory. • True • False 9. What happens when the segment number > segment-table length register? • The segment is grown to accommodate the request • Fragmentation • The process is swapped out • Segmentation fault 1. Which dynamic storage allocation strategy produces the largest leftover hole: • First-fit • Best-fit • Worst-fit • None of the above 2. External fragmentation is when not enough memory space exists to satisfy a request due to each allocation being larger than necessary. • True • False 3. An invalid bit means which of the following: • The page is swapped out • The page is not in the process’s logical address space • The page is not in the process’s physical address space • The page has not been allocated 4. If a 32-bit machine has a 4K page size, which of the following are valid sizes (in bits) for the page number, offset of the logical address: • 20, 12 • 22, 10 • 16, 16 • a & c • None of the above

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