On line power optimization of data flow multi-core architecture based on vdd-hopping for local DVFS

  • Authors:
  • Pascal Vivet;Edith Beigne;Hugo Lebreton;Nacer-Eddine Zergainoh

  • Affiliations:
  • CEA-Leti, Minatec, Grenoble, France;CEA-Leti, Minatec, Grenoble, France;CEA-Leti, Minatec, Grenoble, France;TIMA, Grenoble, France

  • Venue:
  • PATMOS'10 Proceedings of the 20th international conference on Integrated circuit and system design: power and timing modeling, optimization and simulation
  • Year:
  • 2010

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Abstract

With growing integration, power consumption is becoming a major issue for multi-core chips. At system level, per-core DVFS is expected to save substantial energy provided an adapted control. In this paper we propose a local on-line optimization technique to reduce energy in data-flow architecture, thanks to a Local Power Manager (LPM) using Vdd-Hopping for efficient local DVFS. The proposed control is a hybrid global and local scheme which respects throughput and latency constraints. The approach has been fully validated on a real MIMO Telecom application using a SystemC platform instrumented with power estimates. Local DVFS brings 45% power reduction compared to idle mode. When local on-line optimization benefit from computation time variations, 30% extra energy savings can be achieved.