Many virtual machines exist for sensor nodes with only a few KB RAM and tens to a few hundred KB flash memory. They pack an impressive set of features, but suffer from a slowdown of one to two orders of magnitude compared to optimised native code, reducing throughput and increasing power consumption. Compiling bytecode to native code to improve performance has been studied extensively for large...

(ABSTRACT) As chip vendors are increasingly manufacturing a new generation of multi-processor chips called multicores, improving software performance requires exposing greater concurrency in software. Since code that must be run sequentially is often due to the need for synchronization , the synchronization abstraction has a significant effect on program performance. Lock-based synchronization ...

Live-migration has become a common operation on virtualized infrastructures. Indeed, it is widely used by resource management algorithms to distribute the load between servers and to reduce energy consumption [1, 2]. Operators rely also on migrations to prepare production servers for critical maintenance by relocating their running VMs elsewhere. To apply new VM placement decisions, livemigrati...

The Distributed Virtual Communication Machine (DVCM) is a software communication architecture for clusters of workstations equipped with programmable network interfaces (NIs) for high-speed networks. DVCM is an extensible architecture, which promotes the transfer of application modules to the NI. By executing ‘closer’ to the network, on the NI CoProcessor, these modules can communicate with sig...

We present an experimental study showing that soft memory errors can lead to serious security vulnerabilities in Java and .NET virtual machines, or in any system that relies on type-checking of untrusted programs as a protection mechanism. Our attack works by sending to the JVM a Java program that is designed so that almost any memory error in its address space will allow it to take control of ...

JMTk is a memory management toolkit written in Java, originally for the JikesRVM Java Virtual Machine. JMTk provides reusable components for the development of allocation and garbage collection algorithms, an efficient implementation of a rapidly growing number of memory management schemes, and is an important enabler for memory management research. A portable version of JMTk will allow the gro...

Three-dimensional stacked Wide I/O DRAMs have been proposed as a promising solution to overcome the pin-limited memory performance growth, the power vs. bandwidth dilemma and the Memory Wall. This new DRAM architecture and organisation requires a new generation of DRAM memory controllers. Virtual platforms enable us to explore the complete design space of memory controllers with an accurate pow...

Recent technological advances in memory management architectures, multiprocessor systems, and software architectures dictate a reevaluation of the virtual memory management support provided by an operating system. The problems posed by multiprocessor systems and the portability issues raised by the large variety of memory management units available have not been satisfactorily addressed by past...

The popularity of the Java language is easily understandable analyzing the specific features of the language and the execution environment. However, there are still aspects of the Java execution environment that are not exploited. One of the most distinctive features of this platform is the knowledge that the Java Virtual Machine (JVM) has about the runtime characteristics of the applications. ...

Virtual machine (VM) memory allocation and VM consolidation can benefit from the prediction of VM page miss rate at each candidate memory size. Such prediction is challenging for the hypervisor (or VM monitor) due to a lack of knowledge on VM memory access pattern. This paper explores the approach that the hypervisor takes over the management for part of the VM memory and thus all accesses that...