SGLang Breakable CUDA Graph Deep Dive: 3.8–5.2× Faster Prefill Graph Building
hsu_byron · x · 2026-09-05
The SGLang team published a fully visualized deep dive on Breakable CUDA Graph (BCG), which landed in February 2026, became the default prefill path in April, and was adopted by the diffusion stack in July. Built with Meta, NVIDIA, AMD, thinkymachines and PyTorch, key results:
- BCG captures graphs where traditional CUDA Graph can't work around uncapturable ops
- Prefill graphs build 3.8–5.2× faster, in a quarter of the code
- Prefill runs 1.70× over eager with BCG, and 1.93× with full capture
A must-read for inference-stack engineers; full blog linked in the thread.
Related event: SGLang's Breakable CUDA Graph Speeds Prefill Graph Building Up to 5x(2 posts)→
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