Differences in Architectures

• What communication assist does

  • sophisticated v.s. naïve
  • Pure Message Passing
    • send/receive tag to match sender with receiver process
  • NUMA
    • load/store but no caches
  • CC-NUMA (whole unit on this…)

• Where communication assist is connected

  • I/O bus
  • Memory Bus
  • Registers

• These plus host OS & library, Network Interface, Network all affect programmability and performance

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