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Author Jayakumar, Hrishikesh ♦ Raha, Arnab ♦ Lee, Woo Suk ♦ Raghunathan, Vijay
Source ACM Digital Library
Content type Text
Publisher Association for Computing Machinery (ACM)
File Format PDF
Copyright Year ©2015
Language English
Subject Domain (in DDC) Computer science, information & general works ♦ Data processing & computer science
Subject Keyword Embedded systems ♦ Ferroelectric RAM ♦ Energy harvesting ♦ Low power design ♦ Nonvolatile memory ♦ Transiently powered computers
Abstract Transiently Powered Computers (TPCs) are a new class of batteryless embedded systems that depend solely on energy harvested from external sources for performing computations. Enabling long-running computations on TPCs is a major challenge due to the highly intermittent nature of the power supply (often bursts of < 100ms), resulting in frequent system reboots. Prior work seeks to address this issue by frequently checkpointing system state in flash memory, preserving it across power cycles. However, this involves a substantial overhead due to the high erase/write times of flash memory. This article proposes the use of Ferroelectric RAM (FRAM), an emerging nonvolatile memory technology that combines the benefits of SRAM and flash, to seamlessly enable long-running computations in TPCs. We propose a lightweight, $\textit{in-situ}$ checkpointing technique for TPCs using FRAM that consumes only $30\textit{nJ}$ while decreasing the time taken for saving and restoring a checkpoint to only $21.06μ\textit{s},$ which is over two orders of magnitude lower than the corresponding overhead using flash. We have implemented and evaluated our technique, QuickRecall, using the TI MSP430FR5739 FRAM-enabled microcontroller. Experimental results show that our highly-efficient checkpointing translate to significant speedup (1.25x - 8.4x) in program execution time and reduction (∼3x) in application-level energy consumption.
ISSN 15504832
Age Range 18 to 22 years ♦ above 22 year
Educational Use Research
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2015-08-03
Publisher Place New York
e-ISSN 15504840
Journal ACM Journal on Emerging Technologies in Computing Systems (JETC)
Volume Number 12
Issue Number 1
Page Count 19
Starting Page 1
Ending Page 19

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Source: ACM Digital Library