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Virtualization technology has been widely adopted to enable elastic IT infrastructure, with improved manageability and increased service reliability. Especially, virtualization technology could provide a unique benefit to protect any legacy application systems from hardware failures. The reliability of virtual machines running on virtualized servers is not only threatened by hardware failures beneath...
Multicore architectures offer a convenient way to unlock concurrency between application (called mutator) and garbage collector, yet efficient synchronization between the two by means of barriers is critical to unlock this concurrency. Hardware Transactional Memory (HTM), now commercially available, opens up new ways for synchronization with dramatically lower overhead for the mutator. Unfortunately,...
As discovered in our previous benchmark works, a small number of workloads in PARSEC benchmark suite suffer from heavy performance loss in a virtual execution environment, of which the major loss exhibits fairly a strong connection with the thread synchronization operations. This paper examines one workload of this kind that makes heavy use of thread synchronization operations, and shows the performance...
Recent improvements in architectural supports for virtualization have extended traditional hardware page walkers to traverse nested page tables. However, current two-dimensional (2D) page walkers have been designed under the assumption that the usage patterns of guest and nested page tables are similar. In this paper, we revisit the architectural supports for nested page table walks to incorporate...
Multiprocessor operating systems (OSs) pose several unique and conflicting challenges to System Virtual Machines (System VMs). For example, most existing system VMs resort to gang scheduling a guest OS's virtual processors (VCPUs) to avoid OS synchronization overhead. However, gang scheduling is infeasible for some application domains, and is inflexible in other domains. In an overcommitted environment,...
Safety-critical systems have to work correctly and meet time constraints even in the presence of faults. Hardware fault-tolerant technology can provide a high level of reliability, but custom-designed hardware and operating system are too costly to be accepted by most common applications. At present, some research works about hot-spare fault-tolerant systems based on virtualization technology have...
FAUmachine is a virtual machine for the highly detailed simulation of standard PC hardware together with an environment. FAUmachine comes with fault injection capabilities and an automatic experiment controller facility. Due to its use of just-in-time compiler techniques, it offers good performance. This tool description introduces the new feature of FAUmachine to simulate systems deterministically...
Problems of overall safety management, appropriate load balance, and the need for easy-to-use emerge in an environment containing multiple trusted virtualized platforms. We proposed the generalized trusted virtualized platform architecture, GTVP, which combines multiple physical platforms as a trusted union. GTVP first establishes trust relationship among all platforms, and then synchronizes their...
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