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Transport Layers

Transport layers dictate latency, throughput, and CPU involvement. Document the trade-offs explicitly.

Common transport families​

  • RDMA-based fabrics (InfiniBand, RoCE)
  • Proprietary interconnects (Slingshot, Omni-Path)
  • Shared-memory transports within a node

Evaluation questions​

  • What is the latency floor for small messages?
  • Where does bandwidth saturate?
  • How much CPU time does progress require?

Integration considerations​

Map the transport capabilities to runtime features like atomics, collectives, and active messages to avoid “fast path” surprises.

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