RL infra detail: re-prefill over PipelineRL's KV cache reuse, batch size for GPU utilization
stochasticchasm · x · 2026-09-22
A technical commentary on an RL training setup notes two interesting engineering choices: instead of PipelineRL's approach of keeping the old KV cache, the team opts to re-prefill; and large batch sizes are motivated as helping GPU utilization more than any training effects. The author also speculates what "behaviors" means — possibly optimized code/performance measured via relative ranking — and hopes the released environments provide more detail.
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