vLLM Details Beam Architecture and Kernel-Level Long-Context Optimizations
The vLLM team detailed Beam's architecture—a 52-layer MoE activating 8 of 256 experts per token with dense MLP in the first 3 layers—and kernel-level optimizations including fused all-reduce + norm, packed QKV and tanh softcap kernels that cut forward time by up to 20% on GB200.
2026-10-16 ~ 2026-10-16 · 2 related posts
- Episode 1: Reflection Open-Sources Beam-1.0, a 501B-Parameter MoE with 1M Context(2026-10-16, 20 posts)
- Episode 2: vLLM Details Beam Architecture and Kernel-Level Long-Context Optimizations(2026-10-16, 2 posts)
- Inside Beam: 8-of-256 expert routing across 52 layers, sliding window plus NoPE attention — vllm_project · 2026-10-16
- vLLM's Beam serving kernels cut GB200 forward time from 8.15 to 6.47 ms at TP8 batch 128 — vllm_project · 2026-10-16