Symphony detects step misalignments in ring collectives via lightweight in-network tracking and mitigates them by throttling outpacing flows with congestion signals, yielding up to 54% better communication times in Astra-Sim simulations and a Tofino2 prototype.
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In-network congestion marking for synchronization packets enables better delay filtering, improving clock offset accuracy by 80%+ in hardware and 30-80% in multi-hop scenarios without protocol changes.
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Symphony: Taming Step Misalignments in the Network for Ring-based Collective Operations
Symphony detects step misalignments in ring collectives via lightweight in-network tracking and mitigates them by throttling outpacing flows with congestion signals, yielding up to 54% better communication times in Astra-Sim simulations and a Tofino2 prototype.
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Improving Network Clock Synchronization by Marking Congestion
In-network congestion marking for synchronization packets enables better delay filtering, improving clock offset accuracy by 80%+ in hardware and 30-80% in multi-hop scenarios without protocol changes.