Question: 3, What is cache coherence? Explain briefly the directory based protocol for coherence problem. 4. What is data hazard? Evaluate the performance of pipelining method

3, What is cache coherence? Explain briefly the directory based protocol

3, What is cache coherence? Explain briefly the directory based protocol for coherence problem. 4. What is data hazard? Evaluate the performance of pipelining method compare with traditional method in percentage where one cycle is equal to 4ns

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