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Advances in computer technology have made this technology part of everyone's daily life. This in turn has created a demand for various applications to run on different machines. Java programming language was introduced to address this demand. However, to execute the Java programs, the computers must have a machine, called Java Virtual Machine (JVM) that translates its generic codes to machine-specific...
Due to the thriving of the mobile devices market, there has been a great momentum in adopting Java technology in embedded mobile devices where optimizing energy consumptions extremely critical. However, since Java Virtual Machines(JVMs) are conventionally used for server side clusters, the energy and memory tradeoffs on embedded devices are not well understood. In this work, we attempt to find out...
Java Card is a Java running environment specific for smart cards. In such low-end embedded systems, the execution time of the applications is an issue of first order. One of the components of the Java Card Virtual Machine (JCVM) playing an important role in the execution speed is the bytecode interpreter. In Java systems the main technique for speeding-up the interpreter execution is the Just-In-Time...
Small devices are running software ever more complex. In this scenario, which has been expanding with trends such Internet of Things (IoT) and Ubiquitous computing, becomes even more significant the process of debugging. The use of high-level language virtual machines (VM) on embedded systems can avoid issues on the portability, safety and memory management. However, it presents challenges for debugging...
The discussion on how to effectively program embedded systems has often in the past revolved around issues like the ideal instruction set architecture (ISA) or the best operating system. Much of this has been motivated by the inherently resource-constrained nature of embedded devices that mandates efficiency as the primary design principle.
Language based protection and high-level language virtual machines (JVM, CLR) have solved many problems of portability and dependability. Development of operating systems with these characteristics for embedded systems could enjoy these benefits with the solution of basic problems related to resource consumption and performance. This paper presents the JingleOS, an operating system designed on these...
In Java programs, it needs to use the information of the method type to resolve the virtual method dynamically, which restricts the performance greatly. Currently, the solution is mainly the technique of inline caching, which can be divided into two categories: monomorphic inline caching and polymorphic inline caching. Because of the simple implementation of monomorphic inline caching, it is more...
This paper presents a significantly improved strategy for accelerating the method calls in the REALJava coprocessor. The hardware assisted virtual machine architecture is described shortly to provide context for the method call acceleration. The strategy is implemented in an FPGA prototype. It allows measurements of real life performance increase, and validates the whole co-processor concept. The...
Java is one of the most popular programming architectures because of its platform-independence. Its platform-independence depends on Java virtual machine JVM. Compared to executing class file on hardware JVM, executing class file on software JVM is much slower. By studying we master the component architecture and the working principle of software JVM based on the class file to explain the implementation...
As the bytecode produced by the Java compiler is unoptimized, the bytecode generated from certain types of idiomatic Java code is inefficient for execution in an interpreter. This effect is amplified in a co-processor system, in which a single processor must process heap accesses and virtual method calls from multiple threads. Two types of optimizations are presented which can be performed directly...
Programming Wireless Sensor Networks (WSN) involves learning very different programming paradigms from those commonly used in the development of computer systems. Due to the lack of advantages obtained from the last generation high level programming languages, the growth of WSNs is significantly impeded. Programming WSN nodes requires knowledge of specific hardware which depends on the WSN architecture...
Object migration in wireless sensor networks has the potential to reduce energy consumption for a wireless sensor network mesh. Automated migration reduces the need for the programmer to perform manual static analysis to find an efficient layout solution. Instead, the system can self-optimise and adjust to changing conditions. This paper describes an automated, transparent object migration system...
Java is dominating in object-oriented computing. However, Java relies on Java Virtual Machine to process Java bytecodes, such that it imposes large overhead on the embedded system. In addition, as security is always a major concern in most of the networked computer systems, embedded systems should provide security features to defend against attacks. Many viruses use the security loopholes to trigger...
Mobile devices such as cell phones, GPS guiding systems, and mp3 players, now become one of the most important consumer electronic products. Being an embedded system, mobile devices are highly integrated in software and hardware for robustness, high performance, and low cost. The problem is that this also makes it very difficult to understand the internal interactions of hardware as well as software...
Affordable transparent clustering solutions to scale non-HPC applications on commodity clusters (such as Terracotta) are emerging for Java Virtual Machines (JVMs). Working in this direction, we propose the Anaconda framework as a research platform to investigate the role Transactional Memory (TM) can play in this domain. Anaconda is a software transactional memory framework that supports clustering...
This work analyses the performance of Hadoop, an implementation of the MapReduce programming model for distributed parallel computing, executing on a virtualisation environment comprised of 1 + 16 nodes running the VMWare workstation software. A set of experiments using the standard Hadoop benchmarks has been designed in order to determine whether or not significant reductions in the execution time...
Techniques are presented for reducing the performance overhead of switch instructions in a multicore hardware-accelerated Java virtual machine. The bytecode instruction set is extended with two new instructions suitable for hardware implementation and the complicated switch instructions are converted in the software portion of the virtual machine into series of hardware-implemented instructions using...
Object representation model is critical to the execution speed of Java programs because it has a great impact on the speed of accessing objects and Java is a object based programming language. In this paper, a novel object representation model for Java is proposed, where object fields can be accessed directly and parallelly to reduce the access overhead. Compared with other Java processors, jHISC...
Many software systems in use today have enormous trusted computing bases (TCBs). We propose an architecture that makes it possible to shrink the TCB of many such systems. Our solution is based on a virtual-machine (VM) with added information-flow capabilities. In our architecture, all application programs run outside of the TCB under the control of the VM and cannot cause information leaks even if...
This paper provides a complete framework for thread migration using JPDA. In our framework neither we lose portability nor do we insert any artificial code. The system developed based on our framework needs no extra involvement of programming to continue the whole migration system. It is a powerful autonomous system for heterogeneous environment maintaining its portability since Java Virtual Machine...
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