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GATE 2019 - Computer Organization Quiz-9 (Secondary Memory )

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Question 1

Hit ratio of the cache memory read request is 75% and the cache memory is 5 times faster than main memory. Block size in memory organization is 4 words. The access time of the main memory is 60ns per word. Write through protocol (simultaneous memory organization) is used in the system. CPU generates 80% of the read requests to read the data and the remaining for write operation. What is the average access time (in ns) of the memory when considering both read and write operations?

Question 2

Consider a disk sequence with 100 cylinders. The request to access the cylinder occur in the following sequence:
4, 34, 10, 7, 19, 73, 2, 15, 6, 20
Assuming that the head is currently at cylinder 50, what is the time taken to satisfy all requests if it takes 2 ms to move from one cylinder to adjacent one and shortest seek time first policy is used?

Question 3

A disk is marked with an average seek time of 8 ms, it rotates at 7200 rpm and has a data transfer rate of 5 MB/sec, What is the average time for accessing a file of 8 kB? (in milliseconds)
[Note: 1 M =, 1 k =]

Question 4

The width of the physical address on a machine is 40 bits. The width of the tag field in a 512 KB 8-way set associative cache is, the number of offset ____ bits. ?

Question 5

Which of the following is/are true?
S1: The main advantage of direct mapping is that the cache hit ratio increases drastically if two or more frequently used blocks map onto same region.
S2: For two level memory hierarchy cache and main memory, WRITE THROUGH results in more write cycles to main memory then WRITE BACK.
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