NDLI: Dynamic Logging with Dylog in Networked Embedded Systems

Content Provider	ACM Digital Library
Author	Huang, Chao Luo, Luyao Dong, Wei
Copyright Year	2015
Abstract	Event logging is an important technique for networked embedded systems like wireless sensor networks. It can greatly help developers to understand complex system behaviors and diagnose program bugs. Existing logging facilities do not well satisfy three practical requirements: $\textit{flexibility},$ $\textit{efficiency},$ and high synchronization accuracy. To simultaneously satisfy these requirements, we present Dylog, a dynamic logging facility for networked embedded systems. Dylog employs several techniques. First, Dylog uses binary instrumentation for dynamically inserting or removing logging statements, enabling $\textit{flexible}$ and interactive debugging at runtime. Second, Dylog incorporates an $\textit{efficient}$ storage system and log collection protocol for recording and transferring the logging messages. Third, Dylog employs a lightweight data-driven approach for reconstructing the synchronized time of the logging messages. Dylog uses MAC-layer timestamping and drift compensation to achieve high synchronization accuracy. We implement Dylog on the TinyOS 2.1.1/TelosB platform. Results show the following: (1) Dylog incurs a small overhead. Indirections in Dylog incur an additional execution overhead of less than 1%. Dylog reduces the logging storage size by approximately 50% compared with the standard TinyOS radio printf library. Dylog reduces the patch size by more than 90%, compared with incremental reprogramming. (2) Dylog reduces the synchronization overhead by 78% in terms of transmission cost, compared with a traditional time synchronization protocol, FTSP, and it can achieve a high time synchronization accuracy of 5.4μs. (3) Dylog can help diagnose system problems effectively at the source-code level for three real-world scenarios.
Starting Page	1
Ending Page	25
Page Count	25
File Format	PDF
ISSN	15399087
e-ISSN	15583465
DOI	10.1145/2807698
Volume Number	15
Issue Number	1
Journal	ACM Transactions on Embedded Computing Systems (TECS)
Language	English
Publisher	Association for Computing Machinery (ACM)
Publisher Date	2015-12-31
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Networked embedded systems Diagnosis Logging
Content Type	Text
Resource Type	Article
Subject	Hardware and Architecture Software

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4	Project PI / Joint PI	Principal Investigator and Joint Principal Investigators of the project	Dr. B. Sutradhar bsutra@ndl.gov.in Prof. Saswat Chakrabarti will be added soon
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