DynaResize: Runtime GPU Reallocation for Disaggregated LLM Post-Training

Hanlin Du; Zhiyuan Yan; Yungang Bao; Sa wang

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arXiv · 2607.22614

DynaResize: Runtime GPU Reallocation for Disaggregated LLM Post-Training

Hanlin Du·Zhiyuan Yan·Yungang Bao·Sa wang

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Abstract

RL-based LLM post-training increasingly disaggregates Rollout and Training across separate GPU resources, but static GPU partitioning suffers from severe pipeline bubbles under long-tail rollout latency. We present DynaResize, a runtime GPU reallocation system that dynamically switches GPUs between Rollout and Training to balance stage execution times without changing RL semantics. DynaResize decomposes resizing into fine-grained operations and removes non-startup-critical work from the critical path through communicator reuse, bounded state staging, and hysteresis-based resizing. Experimental results show that DynaResize can improve end-to-end throughput by 66.5% and reduce total execution time by 33% over the optimal static configuration, while hiding 27% of role-switching overhead.

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Hanlin Du, Zhiyuan Yan, Yungang Bao, Sa wang. 2026-06-15. DynaResize: Runtime GPU Reallocation for Disaggregated LLM Post-Training. https://arxiv.org/abs/2607.22614

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