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E-Bunny: A Dynamic Compiler for Embedded Java Virtual Machines

Profile image of Hamdi YahyaouiHamdi Yahyaoui

2005, The Journal of Object Technology

Abstract

A new acceleration technology for Java embedded virtual machines is presented in this paper. Based on the selective dynamic compilation technique, this technology addresses the J2ME/CLDC (Java 2 Micro Edition for Connected Limited Device Configuration) platform. The primary objective of our work is to come up with an efficient, lightweight and low-footprint accelerated embedded Java Virtual Machine. This is achieved by the means of integrating a selective dynamic compiler that we called E-Bunny into the J2ME/CLDC virtual machine KVM. This paper presents the motivations, the architecture, the design and the implementation issues of E-Bunny and how we addressed them. Experimental results on the performance of our modified KVM demonstrate that we accomplished a speedup of 400% with respect to the Sun's latest version of KVM. This experimentation was carried on using standard J2ME benchmarks. 1 MOTIVATIONS AND BACKGROUND With the advent and rising popularity of wireless systems, there is a proliferation of small internet-enabled devices (e.g. PDAs, cell phones, pagers, etc.). In this context, Java is emerging as a standard execution environment due to its security, portability, mobility and network support features. In particular, J2ME/CLDC (Java 2 Micro-Edition for Connected Limited Device Configuration) [13] is now recognized as the standard Java platform in the domain of mobile wireless devices such as pagers, handheld PDAs, TV set-top boxes, appliances, etc. It gained big momentum and is now standardized by the Java Community Process (JCP) and adopted by many standardization bodies such as 3GPP, MEXE and OMA. Another factor that has amplified the wide industrial adoption of J2ME/CLDC is the broad range of Java based solutions that are available in the market. All these factors make Java and J2ME/CLDC an ideal solution for software development in the arena of embedded systems. The heart of J2ME/CLDC technology is Sun's Kilobyte Virtual Machine (KVM) [14]. The KVM is a Java virtual machine initially designed with the constraints of

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  23. Abdelouahed Gherbi received his Engineering degree in Com- puter Engineering in 1992 and his Master degree in 1997, from the University of Constantine, Algeria. He is a Ph.D. student in the Electrical and Computer Engineering Department at Concordia Uni- versity in Montreal. The main topic of his research activities is the acceleration of embedded Java virtual machines. He can be reached at gherbi@ciise.concordia.ca. Lamia Ketari is a researcher at CSA (Computer Security and Acceleration) research group at Concordia Institute for Informa- tion Systems Engineering, Concordia University, Montreal, Quebec, Canada. She holds an MBA in Management Information Systems form Laval University. Currently, she is pursuing a Ph.D. thesis on the acceleration of Java for wireless devices and semantic-based op- timization correctness. In the past, she worked on malicious code detection in COTS (Commercial Off-The-Shelf) applications. More specifically, she worked, with the collaboration of other research group members, on the implementation of a tool for monitoring crit- ical system resources for malicious code detection, called: DaMon (Dynamic Analysis Monitoring). She can be reached at ketari@ciise.concordia.ca. Chamseddine Talhi is a researcher at CSA (Computer Security and Acceleration) research group at Concordia Institute for Informa- tion Systems Engineering, Concordia University, Montreal, Quebec, Canada. He holds an M.Sc. degree from Constantine University, Algeria. He is pursuing a Ph.D. thesis on the security of embedded Java platforms. He is interested in characterizing enforceable secu- rity policies in resource-constrained platforms. In the past years, he worked on formal specification and verification of telecommunica- tion services. He participated in the design and the implementation of a Java optimizing compiler for J2ME/CLDC. He can be reached at talhi@ciise.concordia.ca.

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Related topics

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