Garbage collection is a vital part of a virtual machine. However, the choice of garbage collector and its correct implementation is different for each type of system, especially real-time systems. It is hard to imagine what is happening internally within the garbage collector, which can lead to extremely fragmented systems or systems with degraded performance. GCspy [1] is a free visualization ...

In October of 1997, a year-long collaborative project was started between Hitachi Europe Limited (HEL) and the Edinburgh Parallel Computing Centre (EPCC) at the University of Edinburgh. This project had the goal of producing an environment whereby Java programs may be executed on the Hitachi SR2201 distributed memory multi-processor machine. The two key deliverables from this work are a port of...

Virtual machine technology and the ease with which VMs can be migrated within the LAN, has changed the scope of resource management from allocating resources on a single server to manipulating pools of resources within a data center. We expect WAN migration of virtual machines to likewise transform the scope of provisioning compute resources from a single data center to multiple data centers sp...

Java is an object oriented programming language. But mainly because of the costs it’s not widely used on embedded systems. Typical Java virtual machines require larger systems. This work aims for integration of Java on inexpensive 8-bit microcontrollers. This makes Java possible in the world of measurement, control and automation and allows the combination of control, user interaction and commu...

Massively parallel processors have begun using commodity operating systems that support demand-paged virtual memory. To evaluate the utility of virtual memory, we measured the behavior of seven shared-memory parallel application programs on a simulated distributed-shared-memory machine. Our results (1) connrm the importance of gang CPU scheduling, (2) show that a page-faulting processor should ...

In face of the high number of different hardware platforms that we need to program in the Internet-of-Things (IoT), Virtual Machines (VMs) pose as a promising technology to allow a program once, deploy everywhere strategy. Unfortunately, many existing VMs are very heavy to work on resourceconstrained IoT devices. We present COISA, a compact virtual platform that relies on OpenISA, an Instructio...

Article history: Received 29 July 2010 Received in revised form 3 November 2010 Accepted 8 February 2012 Available online 3 March 2012

Parallel architectures with shared memory are well suited to many applications, provided that efficient shared memory access and process synchronization mechanisms are available. When the parallel machine is a cluster with physically distributed memory, software based synchronization mechanisms together with virtual memory infrastructure can implement Software Distributed Shared Memory (S-DSM),...

The Design and Implementation of a Java Virtual Machine on a Cluster of Workstations by Carlos Daniel Cavanna Master of Applied Science Edward S. Rogers Sr. Department of Electrical and Computer Engineering University of Toronto 2003 We present the design, implementation, and evaluation of a Java Virtual Machine (JVM) on a cluster of workstations, which supports shared memory in software. More ...

For the application of Java in realtime and safety critical domains, an analysis of the worst-case execution times of primitive Java operations is necessary. All primitive operations must either execute in constant time or have a reasonable upper bound for their execution time. The difficulties that arise for a Java virtual machine and a Java compiler in this context will be presented here. Thi...