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- W4287551129 abstract "Consider a system of identical server pools where tasks with exponentially distributed service times arrive as a time-inhomogenenous Poisson process. An admission threshold is used in an inner control loop to assign incoming tasks to server pools while, in an outer control loop, a learning scheme adjusts this threshold over time to keep it aligned with the unknown offered load of the system. In a many-server regime, we prove that the learning scheme reaches an equilibrium along intervals of time where the normalized offered load per server pool is suitably bounded, and that this results in a balanced distribution of the load. Furthermore, we establish a similar result when tasks with Coxian distributed service times arrive at a constant rate and the threshold is adjusted using only the total number of tasks in the system. The novel proof technique developed in this paper, which differs from a traditional fluid limit analysis, allows to handle rapid variations of the first learning scheme, triggered by excursions of the occupancy process that have vanishing size. Moreover, our approach allows to characterize the asymptotic behavior of the system with Coxian distributed service times without relying on a fluid limit of a detailed state descriptor." @default.
- W4287551129 created "2022-07-25" @default.
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- W4287551129 date "2020-12-18" @default.
- W4287551129 modified "2023-09-23" @default.
- W4287551129 title "Learning and balancing unknown loads in large-scale systems" @default.
- W4287551129 doi "https://doi.org/10.48550/arxiv.2012.10142" @default.
- W4287551129 hasPublicationYear "2020" @default.
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