Slides available here!

Speaker:

Anca Molnos, CEA-Leti, France

Title:

SoC energy management via feedback control for data parallel applications with throughput constraints

Abstract:

Energy efficiency is one of the crucial concerns today in computing systems. Recent SoCs comprise an increasing number of voltage-frequency islands (VFI) that should be controlled at application level, to reduce energy consumption. In this context, this talk proposes a proportional-integral feedback controller tailored for data flow applications with throughput constraints. As a research vehicle, we employ a tiled many-core architecture with four VFIs. The use case is a data parallel application described utilising the Multicore Communications API (MCAPI). The controller settings are investigated for application configurations with different QoS levels and different buffer sizes. Several state-of-the-art controllers are compared. We find that the proportional-integral controller achieves similar energy reduction with significantly fewer number of VF switches and, in addition, it meets throughput constraint in cases where other approaches fail.

Bio:

Anca Molnos received her M.Sc. degree in computer science from the "Politehnica" University of Bucharest, Romania and the Ph.D. degree in computer engineering from the Delft University of Technology, The Netherlands, in 2001 and 2009, respectively. Between 2006 and 2009 she was senior scientist at NXP Semiconductors, The Netherlands, working on low-power multi-processors and distributed real-time systems. From 2009 to 2012 she was a researcher with the Delft University of Technology, working on embedded multi-core resource management for low-power and quality of service. In January 2013 she joined CEA LETI, where her research focuses on developing energy-aware software, energy and variability management, and frameworks for adaptable parallel systems. During the years, she (co-)authored more than 40 papers in journals and international conferences and several patents. She serves or served in many technical committees, among which ICCD, ICCAD, RTCSA, SCOPES, DSD, was program co-chair MPSoC'14, and has been actively involved in the organization of several workshops and special sessions.



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