The practical story is done — the vmap fix works, and in this benchmark it beats fused standard attention once the score matrix outgrows VMEM. But I was left with the nagging question: why did the original fail so badly? What is the hardware actually doing with those tiles? The rest of this post is the rabbit hole I fell into trying to answer that. It shifts from experiment log to architecture explainer — feel free to stop here if the benchmark results are all that matters.
和 Author, 埃米莉·麥加維（Emily McGarvey）
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There aren’t many settings to adjust on an air purifier. Most have low, medium and high fan speeds and possibly an auto-mode that detects impurities in the air and increases the fan speed on your behalf. Air circulates through a purifier faster at higher fan-speed settings so it cleans the air more efficiently. Higher speeds also make the air purifier louder. That means you typically want to find the balance between cleaning power and noise levels.