In computer memory hierarchy, what term describes the condition when requested data is successfully found in the CPU cache, avoiding a high-latency access to main RAM?
Answer and explanation
Correct answer: D. Cache hit
- Step 1: When the CPU generates a memory read request, the cache controller checks tag arrays across cache lines.
- Step 2: If the targeted memory block is present in the cache, a 'cache hit' occurs, enabling the processor to retrieve the operand within 1 to 4 clock cycles.
Answer
Cache hit
Why not the others: 'Cache miss' A cache miss occurs when the requested memory address is absent from cache, forcing a slow fetch from main memory; 'Cache eviction' Cache eviction is the process of removing an existing cache line according to replacement policies like LRU to make room for new data; 'Dirty read' A dirty read is a database transaction anomaly where uncommitted data modified by another transaction is read.
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