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GATE CSE 2024 Session 1 Q53: Write-back vs write-through caches on hits and misses

Question

Consider two set-associative cache memory architectures: WBC, which uses the write back policy, and WTC, which uses the write through policy. Both of them use the LRU (Least Recently Used) block replacement policy. The cache memory is connected to the main memory. Which of the following statements is/are TRUE?

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Answer: B, C (official GATE 2024 final answer key)

Concept used: Write-back keeps dirty blocks and writes them on eviction; write-through keeps memory always up to date.

First step: In write-through no block is ever dirty, so no eviction needs a write back; in write-back the LRU victim may be dirty.

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Source: official GATE 2024 Session 1 CS question paper and final answer key, organised by IISc Bangalore. Question paper · Answer key

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