Introducing co-operative time-slicing for RL in llm-d
The math behind reinforcement learning (RL) post-training for large language models (LLMs) is notoriously unforgiving. As frontier AI labs push the boundaries of reasoning and coding models using RL post-training algorithms like Group Relative Policy Optimization (GRPO), they routinely hit hard architectural and infrastructure constraints. While much of the industry's focus remains on acquiring raw accelerator capacity, infrastructure efficiency is equally critical for achieving the high velocity needed to run multiple RL jobs and drive models to higher levels of intelligence. At scale, distributed RL suffers from severe resource bottlenecks because synchronous sampling and training run as strictly sequential phases, causing trainer and sampler resources to alternate sitting idle. Meanwhile, asynchronous architectures attempt to overlap these phases, but trainers still experience frequent idle gaps while waiting for specific trajectory batches to finish before starting the next cycle.
Today, we are introducing a solution to this structural waste: co-operative time-slicingthrough...
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