Computer System Architecture - Multiprocessors

6. Consider a multi-core processor using 3-state MSI protocol. If one of the cache block is in S state , what will be the state(s) of the same cache block in other core(s)?
I. M
II. S
III. I

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7. Suppose an application is running on a 64-processor multiprocessor, which takes 300 cycles to handle reference to a remote memory. If the base CPI is 0.5, how much faster is the multiprocessor if there is no communication versus if 0.3% of the instructions involve a remote communication reference?

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8. Consider a multi-core processor using 3-state MSI protocol. Assume that a cache block is shared across all cores. After some time, one of the cores changes the state of the cache block from ‘S’ to ‘M’, what will be the state(s) of the cache block in other cores?

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9. Necessary conditions for cache coherency to satisfy is/are

  • Option : A
  • Explanation : Option A, B and C are correct.
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10. Consider a multicore processor using directory based MSI protocol. One of the cache block is in ‘M’ state. Due to cache replacement, this block is chosen as a victim. What is the next course of action?

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