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GATE CS 2022 : Computer Organization Quiz-6
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Question 1
Which of the following technique cannot reduce cache hit time
Question 2
A two way set associative cache has lines of 16 byte and a total cache size of 8 K bytes. The 256 M byte main memory is byte addressable. Which one of the following main memory block is mapped on to the set ‘0’ of the cache memory?
Question 3
Consider 4-block cache (initially empty) with the following main memory block references.
4, 5, 7, 12, 4, 5, 13, 4, 5, 7
Identify the hit ratio for Direct mapped cache?
4, 5, 7, 12, 4, 5, 13, 4, 5, 7
Identify the hit ratio for Direct mapped cache?
Question 4
Given that 4 GB and 2 MB are the respective sizes of main memory and cache. Find the most appropriate tag bit length. Assume the block size is same in both cache and main memory and direct mapping is used with byte addressable memory.
Question 5
Consider a cache memory whose access time is 10 ns and main memory access time is 100 ns. Assume the hit ratio of read operation is 0.75 and total of 40 percentage references are for write operation. The average access time (in ns) if write through technique is used ______.
Question 6
A computer has a cache, main memory and a disk used for virtual memory. If a referenced word is in the cache, 20ns are required to access it. If it is in main memory but not in the cache, 50ns are needed to load it into the cache and then the reference is started again. If the word is not in main memory, 12ms are required to fetch the word from disk, followed by 50ns to copy it to the cache and then the reference is started again. The cache hit ratio is 0.9 and the main-memory hit ratio is 0.7 .The average time in ns required to access a referenced word on the system is___________.
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