UCCL-Zip: Lossless Compression Supercharged GPU Communication
The rapid growth of large language models (LLMs) has made GPU communication a critical bottleneck. While prior work reduces communication volume via quantization or lossy compression, these approaches introduce numerical errors that can degrade convergence, accuracy, and stability. We present UCCL-Zip, a unified design that integrates lossless compression directly into GPU communication primitives. UCCL-Zip supports both point-to-point (P2P) and collective communication without modifying user-facing APIs or compromising numerical correctness. For P2P communication, Uzip-P2P employs a split-send pipeline that exposes transmissible data early and overlaps compression with communication, whi...
| Authors | Shuang Ma, Chon Lam Lao, Zhiying Xu et al. |
|---|---|
| Primary category | cs.DC |
| Published | 19 April 2026 |
| Last updated at source | 21 April 2026 |
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