This paper presents new features of PVM, a popular standard for writing parallel programs which execute over networks of heterogeneous machines. Although PVM has become an important infrastructure for parallel programmers, we continue to develop the system based both on user feedback and our own research interests. In this paper we present new communications routines and brieey characterize the...

Dalvik virtual machine’s performance determines the performance of the Android platform. And each Dalvik virtual machine process is a Linux process, and each Dalvik virtual machine thread is a Linux thread. This paper analyses and researches process model of Android Dalvik virtual machine. Through research and analysis the role of Zygote in startup process of Dalvik virtual machine and the Zygo...

This paper addresses the impact of vertical elasticity for applications with dynamic memory requirements when running on a virtualized environment. Vertical elasticity is the ability to scale up and scale down the capabilities of a Virtual Machine (VM). In particular, we focus on dynamic memory management to automatically fit at runtime the underlying computing infrastructure to the application...

Workload consolidation is a technique applied to achieve energy efficiency in data centres. It can be realized via live migration of virtual machines (VMs) between physical servers with the aim to power off idle servers and thus, save energy. In spite of innumerable benefits, the VM migration process introduces additional costs in terms of migration time and the energy overhead. This paper inve...

In this paper, we evaluate the overheads of virtualization in commercial multicore architectures with shared memory and MPI-based applications. We find that the non-uniformity of memory latencies affects the performance of virtualized systems significantly. Due to the lack of support for non-uniform memory access (NUMA) in the Xen hypervisor, shared memory applications suffer from a significant...

I/O virtualization enables time and space multiplexing of I/O devices, by mapping multiple logical I/O devices upon a smaller number of physical devices. However, due to the existence of additional virtualization layers, requesting an I/O from a guest virtual machine requires complicated sequences of operations. This leads to I/O performance losses, and makes precise timing of I/O operations un...

The virtual machine migration is core feature of virtualization that plays important role in cloud computing. The resource utilization is monitored by local migration agent that launches migration of virtual machine from one physical machine to another. Various virtual machine migration techniques are explored for efficient utilization of resources. With rapid increase in data centers, it becom...

A parallel version of a Genetic Algorithm is presented and implemented on a cluster of workstations. Even though our algorithm is general enough to be applied to a wide variety of problems, we used it to obtain optimal/suboptimal solutions to the well known Traveling Salesman Problem. The proposed algorithm is implemented using the Parallel Virtual Machine library over a network of workstations...

Dynamic-analysis techniques have become the linchpins of modern malware analysis. However, software-based methods have been shown to expose numerous artifacts, which can either be detected and subverted, or potentially interfere with the analysis altogether, making their results untrustworthy. The need for less-intrusive methods of analysis has led many researchers to utilize introspection in p...

Content-based page sharing is a technique often used in virtualized environments to reduce server memory requirements. Many systems have been proposed to capture the benefits of page sharing. However, there have been few analyses of page sharing in general, both considering its real-world utility and typical sources of sharing potential. We provide insight into this issue through an exploration...