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Computer Engineering
A computer has four page frames. The time of loading, time of last access, and the Referenced (R) and Modified (M) bits for each page frame are shown in Table 1 (the times are in clock ticks from the process start at time 0). A page fault to virtual page 4 has occurred at time 265.

A computer has four page frames. The time of loading, time of last access, and the Referenced (R) and Modified (M) bits for each page frame are shown in Table 1 (the times are in clock ticks from the process start at time 0). A page fault to virtual page 4 has occurred at time 265.

Computer Networking: A Top-Down Approach (7th Edition)
Computer Networking: A Top-Down Approach (7th Edition)
7th Edition
ISBN:9780133594140
Author:James Kurose, Keith Ross
Publisher:James Kurose, Keith Ross
Chapter1: Computer Networks And The Internet
Section: Chapter Questions
Problem R1RQ: What is the difference between a host and an end system? List several different types of end...
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  1. A computer has four page frames. The time of loading, time of last access, and the Referenced (R) and Modified (M) bits for each page frame are shown in Table 1 (the times are in clock ticks from the process start at time 0). A page fault to virtual page 4 has occurred at time 265.

Table 1: Virtual Page Information

 

Including the initial placement of virtual page in memory (as in Table 1) just before the page fault, consider the following virtual page reference string:

1, 2, 3, 0, 4, 0, 4, 3, 1, 2, 0, 5, 2, 4, 1

 

  1. Referring to Table 1, which page should be replaced for each of the following memory management policies? Explain why the page is replaced.
  2. FIFO
  3. LRU
  4. Optimal (Refer to the reference string)

 

  1. How many page faults would occur if Optimal policy is used? Show clearly when each page fault would occur.
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