Although virtual machine (VM) migration has been used to avoid conflicts on traditional system resources like CPU and memory, micro-architectural resources such as shared caches, memory controllers, and nonuniform memory access (NUMA) affinity, have only relied on intra-system scheduling to reduce contentions on them. This study shows that live VM migration can be used to mitigate the contentio...

Networks of workstations are becoming a dominant force in the distributed computing arena, this due primarily to the excellent price to performance ratio of such systems when compared to traditional massively parallel architectures. It is therefore critical to develop programming languages and environments that can help harness the raw computational power available on these systems. The JavaNow...

Memory deduplication merges same-content memory pages and reduces the consumption of physical memory. It is a desirable feature for virtual machines on IaaS (Infrastructure as a Service) type cloud computing, because IaaS hosts many guest OSes which are expected to include many identical memory pages. However, some security capabilities of the guest OS modify memory contents for each execution ...

In the past few years, computer worms are seen as one of significant challenges of cloud computing. Worms are rapidly changing and getting more sophisticated to evade detection. One major issue to defend against computer worms is collecting worms’ payloads to generate their signature and study their behavior. To collect worms’ payloads, we identified challenges for detecting and collecting worm...

Operational and investment costs are reduced by resource sharing in virtual machine (VM) environments, which also results in an overhead for hosted services. VM machine performance is important because of resource contention. If an application takes a long time to execute because of its CPU or network, it is considered to be a failure because if many VMs are running over a single hardware platf...

Implementing and maintaining file systems is painful. OS functionality is notoriously difficult to develop and debug, and file systems are more so than most because of their size and interactions with other OS components. In-kernel file systems must adhere to a large number of internal OS interfaces. Though difficult during initial file system development, these dependencies particularly compli...

This paper addresses the physical hardware requirements necessary for a co-design hardware/software virtual machine to not only exist, but to also provide comparable performance with other implementation techniques for virtual machines. The discussion will center on requirements of the reconfigurable device and it’s peripheral connections to main memory and the general-purpose processor.

Many server workloads can exhaust the 32-bit virtual address space in the Windows server operating systems. Machines configured with 2 GB or more of RAM installed are particularly vulnerable to this condition. This paper discusses the signs that indicate a machine is suffering from a virtual memory constraint. It also discusses options to keep this from happening, including (1) changing the way...

Virtualization of computer hardware continues to reduce the cost of operation in datacenters. It enables users to consolidate virtual hardware on a smaller number of physical hardware, thereby efficiently using hardware resources. The consolidation ratio is a measure of the virtual hardware that has been placed on physical hardware. A higher consolidation ratio typically indicates greater effic...

stanley g. weinbaum was one of the american science fiction writers of the 1920s and 1930s who anticipated virtual reality early in the development of the genre in the united states. the machine in weinbaum’s science fiction plays a crucial role in the production of virtual space and time. not only does weinbaum’s gadgetry function within the domain of spatial alterity, but they also provide te...