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Exact Makespan Bounds and the GPipe Homogeneity Bias for Heterogeneous LLM Inference Pipelines
We give an exact critical-path characterization of the makespan of micro-batch pipelines serving LLMs on heterogeneous GPU clusters, quantifying how the classic homogeneous GPipe formula errs. In the pure-forward, communication-free, infinite-buffer setting, T(M) = (M-1)tau_max + Sum_j tau_j, where
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