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Efficient FlashAttention on Blackwell via Fixed-Shift Softmax and Persistent Scheduling

Stashuk, Oleksandr et al.
arXiv (All) · Papers
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hardware-architecture
On Blackwell, normalization and operand movement can limit attention kernels whose matrix multiplications are already deeply pipelined. We implement an FA4-style pipeline in Triton TLX with fixed-shift dense softmax and a saved inverse denominator for backward. The fixed shift removes recurrent accu
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