Author

Zhangheng Huang

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Preprint Aug 2026

HiSparse: Scaling Sparse-Attention Decoding with Hierarchical KV Cache Management

HiSparse is merged into upstream SGLang and evaluated across three sparse-attention families (DSA, NSA, and Quest) on H200, B200, and GH200 platforms: it improves peak generation throughput by up to 4.7x on long-context workloads while preserving comparable per-token latency and reducing time-to-first-token at high load.

Zhiqiang Xie, Zhangheng Huang, Ting-Jun Huang et al. · 2 citations