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The betrayal of con...
The betrayal of constant power × time : Finding the missing joules of transiently-powered computers
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- Ahmed, Saad (author)
- Lahore University of Management Sciences, Pakistan
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- Bakar, A. (author)
- Lahore University of Management Sciences, Pakistan
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- Bhatti, Naveed (author)
- RISE,SICS
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- Alizai, M (author)
- Lahore University of Management Sciences, Pakistan
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- Siddiqui, J. H. (author)
- Lahore University of Management Sciences, Pakistan
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- Mottola, Luca (author)
- RISE,SICS,Politecnico di Milano, Italy; RI.SE SICS Sweden
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(creator_code:org_t)
- 2019-06-23
- 2019
- English.
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In: Proceedings of the ACM SIGPLAN Conference on Languages, Compilers, and Tools for Embedded Systems (LCTES). - New York, NY, USA : Association for Computing Machinery. - 9781450367240 ; , s. 97-109
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https://uu.diva-port... (primary) (Raw object)
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https://doi.org/10.1...
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Abstract
Subject headings
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- 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.
Subject headings
- TEKNIK OCH TEKNOLOGIER -- Elektroteknik och elektronik -- Datorsystem (hsv//swe)
- ENGINEERING AND TECHNOLOGY -- Electrical Engineering, Electronic Engineering, Information Engineering -- Computer Systems (hsv//eng)
Keyword
- Energy modelling
- Intermittent computing
- Transiently powered computers
- Embedded systems
- Energy harvesting
- Energy utilization
- Program compilers
- Program debugging
- Analysis techniques
- Constant power
- Debugging tools
- Harvesting energies
- Supply voltages
- System supports
- Energy efficiency
Publication and Content Type
- ref (subject category)
- kon (subject category)
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