Compare write-back vs write-through caches
PayPalSoftware Engineer · Technical Screen
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This question evaluates understanding of caching policies and memory/storage hierarchy trade-offs, focusing on how write-back and write-through handle writes, coherence, durability, latency, bandwidth, dirty bits, write amplification, and power-loss risks.
Compare write-back and write-through caching policies. Explain how each handles writes, coherence, durability, latency, and bandwidth; discuss typical use in CPU caches vs storage systems and the trade-offs (e.g., dirty bits, write amplification, and risk on power loss).
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