Which of the following statements are true?
A. In the write-through policy, only the cache is updated
B. In the write-back policy, both cache and main memory are updated
C. Cache coherence problems exist in multiprocessors with private caches because of the need to share writable data
D. Cache coherence problem can be solved by means of hardware-only scheme
Choose the correct answer from the options given below:
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Correct answer: C. C, D Only
Explanation
A and B are swapped: write-through updates both cache and memory, while write-back updates only the cache (memory is updated when the block is replaced). C is true, and coherence can be maintained by hardware-only schemes such as snoopy or directory protocols, so D is true.More Computer System Architecture questions
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