Regret-Optimal Online Caching for Adversarial and Stochastic Arrivals

Autor:	Faizal, Fathima Zarin, Singh, Priya, Karamchandani, Nikhil, Moharir, Sharayu
Rok vydání:	2022
Předmět:	Computer Science - Networking and Internet Architecture Computer Science - Performance
Druh dokumentu:	Working Paper
Popis:	We consider the online caching problem for a cache of limited size. In a time-slotted system, a user requests one file from a large catalog in each slot. If the requested file is cached, the policy receives a unit reward and zero rewards otherwise. We show that a Follow the Perturbed Leader (FTPL)-based anytime caching policy is simultaneously regret-optimal for both adversarial and i.i.d. stochastic arrivals. Further, in the setting where there is a cost associated with switching the cached contents, we propose a variant of FTPL that is order-optimal with respect to time for both adversarial and stochastic arrivals and has a significantly better performance compared to FTPL with respect to the switching cost for stochastic arrivals. We also show that these results can be generalized to the setting where there are constraints on the frequency with which cache contents can be changed. Finally, we validate the results obtained on various synthetic as well as real-world traces. Comment: 42 pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2211.16051 Zobrazit plný text záznamu View this record from Arxiv