{"type":"post","id":"full-engineering-writeup-covers-dep2-prefill-wide-ep-b2079d","slug":"full-engineering-writeup-covers-dep2-prefill-wide-ep-b2079d","title":"Full engineering writeup covers DEP2 prefill, Wide-EP decode, and CPU overhead fixes.","description":"vLLM published an engineering write-up on serving DeepSeek-V4.1-Flash with prefill/decode disaggregation and Wide-EP decode across an NVIDIA GB300 NVL72 rack.","retrieval_nugget":"vLLM published an engineering write-up on serving DeepSeek-V4.1-Flash with prefill/decode disaggregation and Wide-EP decode across an NVIDIA GB300 NVL72 rack.","published_at":"2026-10-24","updated_at":"2026-10-24","record_date":"2026-10-24","date_kind":"published_at","topics":["harness-engineering","agent-runtime"],"entities":["vLLM","DeepSeek-V4.1-Flash","DeepInfer","NVIDIA GB300 NVL72","SemiAnalysis AgentX"],"related_patterns":["harness-architecture-outlives-model-choice"],"novelty_label":"new_fact","what_changed":"The writeup adds rack-scale GB300 results, DEP2 prefill and Wide-EP/EPLB scaling details, CPU-overhead fixes, and a 826 tokens/s single-user decode path.","prior_refs":["memory:56f8e800-0832-87eb-a8d5-c2519d7104fa","memory:e5f1ce5e-39ce-8087-ab11-b825e426defd","memory:eb27678d-1635-8fbf-a995-67cecf7d972b"],"source_url":"https://vllm.ai/blog/2026-10-23-deepseek-v41-flash-pd-wide-ep","source_urls":["https://vllm.ai/blog/2026-10-23-deepseek-v41-flash-pd-wide-ep"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:full-engineering-writeup-covers-dep2-prefill-wide-ep-b2079d","status":"published","visuals":[],"editor":{"role":"editor","name":"Andrey Reshetnikov","profile":"https://newruntime.com/owner-profile.md","profile_json":"https://newruntime.com/owner-profile.json","same_as":["https://www.linkedin.com/in/reshetnikov1/","https://t.me/lapetuse"]},"routes":{"html":"https://newruntime.com/posts/full-engineering-writeup-covers-dep2-prefill-wide-ep-b2079d/","markdown":"https://newruntime.com/posts/full-engineering-writeup-covers-dep2-prefill-wide-ep-b2079d.md","json":"https://newruntime.com/posts/full-engineering-writeup-covers-dep2-prefill-wide-ep-b2079d.json"},"next_reads":[{"type":"topic","path":"/topics/harness-engineering/","url":"https://newruntime.com/topics/harness-engineering/","title":"Harness Engineering","reason":"Explore the harness-engineering topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/harness-engineering.md","json_url":"https://newruntime.com/topics/harness-engineering.json"},{"type":"topic","path":"/topics/agent-runtime/","url":"https://newruntime.com/topics/agent-runtime/","title":"Agent Runtime","reason":"Explore the agent-runtime topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/agent-runtime.md","json_url":"https://newruntime.com/topics/agent-runtime.json"},{"type":"collection","path":"/posts/","url":"https://newruntime.com/posts/","title":"Field Notes","reason":"Open the latest editorial analysis.","media_type":"text/html","json_url":"https://newruntime.com/posts.json"},{"type":"collection","path":"/source-ledger.json","url":"https://newruntime.com/source-ledger.json","title":"Source Ledger","reason":"Inspect the public source evidence graph.","media_type":"application/json"}]}