RL engineering debate: decoupled rollout vs colocated vLLM, staleness is not a rounding error
willcb · x · 2026-11-13
A Good Will Hunting-style parody aimed at first-year RL engineers argues that reading Prime Intellect's prime-rl writeup doesn't make decoupling generation from training free — staleness isn't a rounding error, and next year the same engineers will champion colocating vLLM in the training process, where waking/sleeping the optimizer saves 400ms per weight sync but just moves the idle GPU elsewhere.
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