Designing Distributed Shared Memory Systems

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Questions and Answers

What is the primary purpose of a node in a Distributed Shared Memory (DSM) system?

  • To manage the entire distributed memory
  • To only cache memory pages
  • To contribute a portion of its physical memory to the DSM system (correct)
  • To replicate memory pages only

How is every address in a DSM system uniquely identified?

  • By a combination of the node identifier and the page frame number (correct)
  • By a unique node identifier
  • By a combination of the node identifier and the memory page number
  • By a unique page identifier

What is the role of the home node for a page in a DSM system?

  • To replicate memory pages only
  • To manage the entire distributed memory
  • To drive all the coherence operations related to that page (correct)
  • To cache memory pages only

What is the primary reason for incorporating caching in a DSM system?

<p>To achieve low latency and high performance (D)</p>
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What information does the home node keep track of for its memory pages?

<p>Pages accessed, modifications, caching enabled/disabled, and lock status (D)</p>
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What is the purpose of the information kept by the home node for its memory pages?

<p>To enforce the sharing semantics that a given DSM will implement (B)</p>
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What is the main issue with accessing a page repeatedly from a node that is not its home node?

<p>It causes a significant delay in state updates. (B)</p>
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What is the role of the home node in a DSM system?

<p>To keep track of who is the current owner of a given page. (A)</p>
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What is the benefit of separating the home node from the owner node?

<p>It allows for more flexibility in managing state updates. (C)</p>
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What is the purpose of creating page replicas in a DSM system?

<p>To increase the performance of the system through load balancing. (C)</p>
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In a datacenter environment, how many copies of shared state are typically created?

<p>Three (C)</p>
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What is responsible for managing the consistency of page replicas in a datacenter environment?

<p>All of the above. (D)</p>
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