Author

Huaibo Huang

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Preprint Aug 2026

FlashPrefill V2: Block-Sparse Prefill Attention for Long-Context LLM Serving

This paper introduces a mean correction term that effectively suppresses the approximation error, keeping performance degradation manageable even at extreme sparsity levels, and redesigns the sparse attention operator with PackGQA memory access, warp specialization, and pingpong pipelining.

Qihang Fan, Huaibo Huang, Zhiying Wu et al. · 0 citations