Power-performance efficiency of asymmetric multiprocessors for multi-threaded scientific applications

  • Authors:
  • Ryan E. Grant;Ahmad Afsahi

  • Affiliations:
  • Department of Electrical and Computer Engineering, Queen's University, Kingston, ON, Canada;Department of Electrical and Computer Engineering, Queen's University, Kingston, ON, Canada

  • Venue:
  • IPDPS'06 Proceedings of the 20th international conference on Parallel and distributed processing
  • Year:
  • 2006

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Abstract

Recently, under a fixed power budget, asymmetric multiprocessors (AMP) have been proposed to improve the performance of multi-threaded applications compared to symmetric multiprocessors. An AMP is a multiprocessor system in which its processors are not operating at the same frequency. Power consumption has become an important design constraint in servers and high-performance server clusters. This paper explores the power-performance efficiency of Hyper-Threaded (HT) AMP servers, and proposes a new scheduling algorithm that can be used to reduce the overall power consumption of a server while maintaining a high level of performance. Prototyping AMPs on a commercial 4-way SMP server, we show that on average 15.6% energy savings and 6.1% slowdown for the HT-disabled case, and 7.1% energy savings and 4.8% slowdown for the HT-enabled case can be achieved across NAS and SPEC OpenMP applications.