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- W2113644092 abstract "Energy efficiency of server farms is an important design consideration of the green datacenter initiative. One effective approach is to optimize power consumption of server farms by controlling the carried load on the networked servers. In this paper, we propose a robust heuristic policy called E* for stochastic job assignment in a server farm, aiming to improve the energy efficiency by maximizing the ratio of job throughput to power consumption. Our model of the server farm considers a parallel system of finite-buffer processor-sharing queues with heterogeneous server speeds and energy consumption rates. We devise E* as an insensitive policy so that the stationary distribution of the number of jobs in the system depends on the job size distribution only through its mean. We provide a rigorous analysis of E* and compare it with a baseline approach, known as most energy-efficient server first (MEESF), that greedily chooses the most energy-efficient servers for job assignment. We show that E* has always a higher job throughput than that of MEESF, and derive realistic conditions under which E* is guaranteed to outperform MEESF in energy efficiency. Extensive numerical results are presented and demonstrate that E* can improve the energy efficiency by up to 100%." @default.
- W2113644092 created "2016-06-24" @default.
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- W2113644092 date "2015-12-01" @default.
- W2113644092 modified "2023-09-27" @default.
- W2113644092 title "Energy-Efficient Heuristics for Insensitive Job Assignment in Processor-Sharing Server Farms" @default.
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- W2113644092 doi "https://doi.org/10.1109/jsac.2015.2483438" @default.
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