Release Consistency Models

• Delay making writes visible

  • Need synchronization

• Goal

  • reduce number of messages
  • hide latency

• But delay until when…?

  • Eager release consistency (RC)
    • do modifications at release
    • delay until Q synchronizes with P
    • P&Q must be data race free
      • Use system primitives, no spin locks
    • Then RC=SC with fewer messages
  • Lazy consistency
    • pull modifications at acquire, no push at release

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