Computers and Technology, 12.12.2020 17:10 sierrathomas431

1. Consider demand paging. You are given the following reference string, page replacement policy and the number of frames available. Calculate the number of page faults in each case. A. ReferenceString:1234234235672342310 989108123 Algorithm: LRU
# of frames: 3
B. Reference String: Algorithm: Optimal
# of frames: 3
C. Reference String: Algorithm: LRU
# of frames: 2
D. Referencestring:1237841241541241281 011324171011 Algorithm: FIFO
# of frames: 3
E. Referencestring:1237841241541241281 011324171011 Algorithm: FIFO
# of frames: 4
To answer the question, write down the # of page fault, and also copy the reference string and circle all references that causes a page fault.
2. For the disk scheduling algorithm such as SCAN/c-SCAN, rotational delays are not used for optimization purpose. Suppose time require for one rotation is nearly the same as time to travel one track during seeking, suggest a way that you can further optimize one of the above algorithms.
3. For main memory allocation, nowadays virtually all systems uses demand paging, not contiguous allocation. However, for space allocation for files, contiguous allocation is still being used. Suggest two reasons why.

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1. Consider demand paging. You are given the following reference string, page replacement policy and...

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