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FlashAttention-4 on H100: Benchmark Faster LLM Inference Properly

Run FA4 on an H100, watch it lose to older kernels, and it is tempting to file a bug. Do not. The kernel is not broken. You picked the wrong tool for that GPU, and that mistake ripples into every benchmark you write. Run Blackwell-specific instructions on Hopper silicon, and the co-design breaks…
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