Dynamic power management for QoS-aware applications

• Published in: Sustainable computing informatics and systems Vol. 3; no. 4; pp. 231 - 248
• Main Authors: Marzolla, Moreno, Mirandola, Raffaela
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.12.2013
• Subjects: Energy proportional computing; Performance modeling; Power management; SLA management; Performance modeling; Power management; Energy proportional computing; SLA management
• ISSN: 2210-5379
• DOI: 10.1016/j.suscom.2013.02.001

Reducing the power requirement of large IT infrastructures is becoming a major concern. Energy savings can be achieved with hardware and/or software solutions; in particular, modern CPUs can operate at different power levels that can be selected by software: low power modes reduce energy consumption at the cost of lowering also the CPU processing rate. In this paper we address the problem of reducing energy consumption of a large-scale distributed application subject to Service Level Agreements requiring a maximum allowed response time. Specifically, we propose Energy Aware reconfiguration of software SYstems (EASY), an on-line algorithm for dynamically adjusting the processing speed of individual devices such that the average system response time is kept below a predefined threshold, and the total power consumption is minimized. EASY uses a queueing networks performance model to proactively drive the reconfiguration process, so that the number of individual reconfiguration actions is reduced. We formulate the energy conservation problem as a Mixed Integer Programming problem, for which we propose a heuristic solution technique. Numerical experiments show that the heuristic produces almost optimal results at a substantially lower computational cost. Therefore, EASY can be effectively applied on-line to make a large system energy-proportional.