{"type":"post","id":"speculative-decoding-uses-the-smaller-draft-model-to-48c074","slug":"speculative-decoding-uses-the-smaller-draft-model-to-48c074","title":"Speculative decoding uses the smaller draft model to propose tokens and the target model to verify them.","description":"vLLM pull request #62009 adds an opt-in `symm_mem` weight-migration backend for expert-parallel load balancing (EPLB), plus fused MegaMoE replica mapping and changes intended to remove asynchronous EPLB host work from the decode critical path.","retrieval_nugget":"vLLM pull request #62009 adds an opt-in `symm_mem` weight-migration backend for expert-parallel load balancing (EPLB), plus fused MegaMoE replica mapping and changes intended to remove asynchronous EPLB host work from the decode critical path.","published_at":"2026-10-24","updated_at":"2026-10-24","record_date":"2026-10-24","date_kind":"published_at","topics":["inference","ai-infrastructure"],"entities":["vLLM","DeepSeek-V4.1-Flash","DSpark","MegaMoE","NVLink"],"related_patterns":[],"novelty_label":"new_fact","what_changed":"A vLLM PR proposes cheaper EPLB for DeepSeek-V4.1-Flash, including symmetric-memory migration and fused MegaMoE mapping, with reported GB300 decode-throughput gains.","prior_refs":["memory:b0babd5e-ff30-88b6-abe3-b5832dc7e4e2","memory:ea6e7e73-49a1-80a4-a848-2a55d27b2300"],"source_url":"https://github.com/vllm-project/vllm/pull/62009","source_urls":["https://github.com/vllm-project/vllm/pull/62009"],"schema_version":"newruntime-agent-readable-v0.2","stable_id":"post:speculative-decoding-uses-the-smaller-draft-model-to-48c074","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/speculative-decoding-uses-the-smaller-draft-model-to-48c074/","markdown":"https://newruntime.com/posts/speculative-decoding-uses-the-smaller-draft-model-to-48c074.md","json":"https://newruntime.com/posts/speculative-decoding-uses-the-smaller-draft-model-to-48c074.json"},"next_reads":[{"type":"topic","path":"/topics/inference/","url":"https://newruntime.com/topics/inference/","title":"Inference","reason":"Explore the inference topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/inference.md","json_url":"https://newruntime.com/topics/inference.json"},{"type":"topic","path":"/topics/ai-infrastructure/","url":"https://newruntime.com/topics/ai-infrastructure/","title":"Ai Infrastructure","reason":"Explore the ai-infrastructure topic hub.","media_type":"text/html","markdown_url":"https://newruntime.com/topics/ai-infrastructure.md","json_url":"https://newruntime.com/topics/ai-infrastructure.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"}]}