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In a write-back cache, a modified (dirty) block is written to the main memory

2311Medium DSSSB TGT Computer Science 0 replies 1 views
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In a write-back cache, a modified (dirty) block is written to the main memory

  • Aonly when the block is replaced in the cache
  • Bat every write to the block
  • Conly when the processor is idle
  • Dat the end of each instruction cycle
Correct answer: A

Explanation

A write-back cache updates only the cache on a write and sets a dirty bit; the block is copied to memory when it is evicted.
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