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LCTES 2019
Sat 22 - Fri 28 June 2019 Phoenix, Arizona, United States
co-located with PLDI 2019
Sun 23 Jun 2019 11:35 - 11:50 at 105A - Session 2: Architecture and Compilers Chair(s): Na Meng

Transiently-powered computers (TPCs) lay the basis for a battery-less Internet of Things, using energy harvesting and small capacitors to power their operation. This power supply is characterized by extreme variations in supply voltage, as capacitors charge when harvesting energy and discharge when computing. We experimentally find that these variations cause marked fluctuations in clock speed and power consumption, which determine energy efficiency. We demonstrate that it is possible to accurately model and concretely capitalize on these fluctuations. We derive an energy model as a function of supply voltage and develop EPIC, a compile-time energy analysis tool. We use EPIC to substitute for the constant power assumption in existing analysis techniques, giving programmers accurate information on worst-case energy consumption of programs. When using EPIC with existing TPC system support, run-time energy efficiency drastically improves, eventually leading up to a 350% speedup in the time to complete a fixed workload. Further, when using EPIC with existing debugging tools, programmers avoid unnecessary program changes that hurt energy efficiency.

Sun 23 Jun

LCTES-2019-papers
11:20 - 12:35: LCTES 2019 - Session 2: Architecture and Compilers at 105A
Chair(s): Na MengVirginia Tech
LCTES-2019-papers11:20 - 11:35
Full-paper
Wanli ChangUniversity of York, Shuai ZhaoUniversity of York, Ran WeiUniversity of York, Andy WellingsUniversity of York, Alan BurnsUniversity of York
LCTES-2019-papers11:35 - 11:50
Full-paper
Saad AhmedLUMS, Pakistan, Abu BakarNorthwestern University, US, Naveed Anwar BhattiRISE, Sweden, Muhammad Hamad AlizaiLUMS, Pakistan, Junaid Haroon SiddiquiLahore University of Management Sciences, Luca MottolaPolitecnico di Milano, Italy and RI.Se SICS, Sweden
LCTES-2019-papers11:50 - 12:05
Full-paper
Xuesong SuUNSW Sydney, Hui WuUniversity of New South Wales, Australia, Jingling XueUNSW Sydney
LCTES-2019-papers12:05 - 12:20
Full-paper
Vanchinathan VenkataramaniNational University of Singapore, Aditi KulkarniNational University of Singapore, Tulika MitraNational University of Singapore, Singapore, Li-Shiuan PehNational University of Singapore
LCTES-2019-papers12:20 - 12:35
Full-paper
Saad AhmedLUMS, Pakistan, Naveed Anwar BhattiRISE, Sweden, Muhammad Hamad AlizaiLUMS, Pakistan, Junaid Haroon SiddiquiLahore University of Management Sciences, Luca MottolaPolitecnico di Milano, Italy and RI.Se SICS, Sweden