@KaichaoYou: Scaling concurrent rollouts is one of the hardest parts of RL training infra. We had fun helping SemiAnalysis stress-te…
Summary
KaichouYou discusses challenges in scaling concurrent rollouts for RL training infrastructure, highlighting a stress test of sandbox scaling on Qwen3 235B with SemiAnalysis, including a writeup of errors and fixes.
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Scaling concurrent rollouts is one of the hardest parts of RL training infra. We had fun helping SemiAnalysis stress-test sandbox scaling on Qwen3 235B. Full writeup of errors and fixes included ↓↓↓
SemiAnalysis (@SemiAnalysis_): RL Systems Mind the Gap: Matching Trainer and Generator Throughput RL Training Infrastructure, GRPO, PipelineRL, Async RL, Policy Staleness, RL Sandbox Infra, CPU Requirements, TCO Analysis, Thinking Machines Tinker
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