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    "story_id": "mp-2026-08-29-002",
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    "headline": "Reasoning Training Became a Systems Problem",
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    "dek": "A compute-centered survey maps how reinforcement-learning post-training turns multiple models, memory paths and asynchronous stages into one distributed workload.",
    "summary": "A compute-centered survey maps how reinforcement-learning post-training turns multiple models, memory paths and asynchronous stages into one distributed workload.",
    "body_text": "The paper systematizes PPO, GRPO and related post-training pipelines through the work-depth model of parallel computing. Its taxonomy spans familiar data, tensor, pipeline, sequence, context and expert parallelism alongside disaggregated placement, stage fusion, hybrid layouts and asynchronous execution. The central argument is architectural: reasoning-model training couples generation, reward, inference and optimization so tightly that algorithm choices cannot be separated from placement and communication costs. This is a synthesis and set of design guidelines, not a measured claim that one framework or topology is universally fastest.",
    "why_it_matters": "A compute-centered survey maps how reinforcement-learning post-training turns multiple models, memory paths and asynchronous stages into one distributed workload.",
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      "The central argument is architectural: reasoning-model training couples generation, reward, inference and optimization so tightly that algorithm choices cannot be separated from placement and communication costs.",
      "This is a synthesis and set of design guidelines, not a measured claim that one framework or topology is universally fastest."
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    "tags": [
      "reasoning models",
      "distributed systems",
      "reinforcement learning"
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      "source_id": "source-2026-08-29-002",
      "title": "arXiv preprint 2608.27046",
      "publisher": "arXiv",
      "url": "https://arxiv.org/abs/2608.27046",
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      "published_at": "2026-08-27T08:33:47.000-04:00",
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  "cite_this_report": {
    "title": "Reasoning Training Became a Systems Problem",
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