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SHIFT: Exploring the boundary of RDMA network fault tolerance.arXiv preprint arXiv:2512.11094, 2025

Shengkai Lin, Kairui Zhou, Hongtao Zhang, Yibo Wu, Yi Pan, Yihan Yang, Qinwei Yang, Wei Zhang, Arvind Krishnamurthy, Shizhen Zhao · 2025 · arXiv 2512.11094

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Don't Let a Few Network Failures Slow the Entire AllReduce

cs.DC · 2026-06-01 · unverdicted · novelty 6.0

OptCC is a pipelined AllReduce algorithm that completes within 2-6% of fault-free NCCL performance under up to 50% bandwidth loss by approaching a new lower bound showing O(1/p) unavoidable overhead for p GPUs.

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  • Don't Let a Few Network Failures Slow the Entire AllReduce cs.DC · 2026-06-01 · unverdicted · none · ref 10

    OptCC is a pipelined AllReduce algorithm that completes within 2-6% of fault-free NCCL performance under up to 50% bandwidth loss by approaching a new lower bound showing O(1/p) unavoidable overhead for p GPUs.