Q5. Cache Coherence [20 points]a. (6p) Why do we need a cache coherence protocol? Explain it?b. (7p) For a directory based cache coherence protocol, there are 4 processors and following requests arrive for a specific cache block. Show the directory entry after each request. P1 takes a read miss P2 takes a write missP3 takes a read missP4 take solutionspile.com

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Q5. Cache Coherence [20 points]a.    (6p) Why do we need a cache coherence protocol? Explain it?b.    (7p) For a directory based cache coherence protocol, there are 4 processors and following requests arrive for a specific cache block. Show the directory entry after each request. P1 takes a read miss P2 takes a write missP3 takes a read missP4 takes a read missP1 takes a read missP2 takes a write missc.    (7p) Compare MESI and MSI protocols. What are their differences and what was the problem that MESI is fixing? Q5. Cache Coherence [ 20 points] a. (6p) Why do we need a cache coherence protocol? Explain it? b. (7p) For a directory based cache coherence protocol, there are 4 processors and following requests arrive for a specific cache block. Show the directory entry after each request. P1 takes a read miss P2 takes a write miss P3 takes a read miss P4 takes a read miss P1 takes a read miss P2 takes a write miss c. (7p) Compare MESI and MSI protocols. What are their differences and what was the problem that MESI is fixing? solutionspile.com

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