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Systems Engineering Playbook: Optimizing Qwen 3.5-397B MoE on Ironwood (TPU7x)

First seen · 8/6/2026, 08:01 AMLatest activity · 8/6/2026, 08:01 AM

According to the supplied Google Developers Blog abstract, engineers serving the 397B-parameter Qwen 3.5 MoE on Ironwood (TPU7x) used a modular JAX/Pallas stack, hybrid data and expert parallelism, hierarchical reduce-scatter, Batched Ragged Page Attention, and a fused Gated DeltaNet block. The post reports up to a 4.7x inference speedup on prefill-heavy workloads and operation near hardware roofline limits. However, the stated publication date is August 6, 2026, and the supplied material includes no benchmark configuration, baseline, code, or independent verification.

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  1. OfficialGoogle Developers Blog8/6, 08:01 AMRepresentative
    Systems Engineering Playbook: Optimizing Qwen 3.5-397B MoE on Ironwood (TPU7x)