VEE

Since their invention over 40 years ago, virtual machines have been used to virtualize one or more von Neumann processors and their associated peripherals. System virtual machines provide the illusion that the user has their own instance of a physical ...

Profilers based on hardware performance counters are indispensable for performance debugging of complex software systems. All modern processors feature hardware performance counters, but current virtual machine monitors (VMMs) do not properly expose ...

Virtualization is a powerful technique used for variety of application domains, including emerging cloud environments that provide access to virtual machines as a service. Because of the interaction of virtual machines with multiple underlying software ...

In today's multi-core systems, cache contention due to true and false sharing can cause unexpected and significant performance degradation. A detailed understanding of a given multi-threaded application's behavior is required to precisely identify such ...

Server virtualization technology facilitates the creation of an elastic computing infrastructure on demand. There are cloud applications like server-based computing and virtual desktop that concern startup latency and require impromptu requests for VM ...

Cloud computing platforms are becoming increasingly popular for e-commerce applications that can be scaled on-demand in a very cost effective way. Dynamic provisioning is used to autonomously add capacity in multi-tier cloud-based applications that see ...

With existing virtualized systems, hypervisor failures lead to overall system failure and the loss of all the work in progress of virtual machines (VMs) running on the system. We introduce ReHype, a mechanism for recovery from hypervisor failures by ...

Checkpointing, i.e., recording the volatile state of a virtual machine (VM) running as a guest in a virtual machine monitor (VMM) for later restoration, includes storing the memory available to the VM. Typically, a full image of the VM's memory along ...

In order to make save and restore features practical, saved virtual machines (VMs) must be able to quickly restore to normal operation. Unfortunately, fetching a saved memory image from persistent storage can be slow, especially as VMs grow in memory ...

Rebooting an operating system is a final but effective recovery technique. However, the system performance largely degrades just after the reboot due to the page cache being lost in the main memory. For fast performance recovery, we propose a new reboot ...

Despite the widespread support for live migration of Virtual Machines (VMs) in current hypervisors, these have significant shortcomings when it comes to migration of certain types of VMs. More specifically, with existing algorithms, there is a high risk ...

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 ...

The emerging open cloud computing model will provide users with great freedom to dynamically migrate virtualized computing services to, from, and between clouds over the wide-area. While this freedom leads to many potential benefits, the running ...

A basic requirement of a secure computer system is that it be up to date with regard to software security patches. Unfortunately, Infrastructure as a Service (IaaS) clouds make this difficult. They leverage virtualization, which provides functionality ...

This paper presents an approach to the safe execution of applications based on software-based fault isolation and policy-based system call authorization. A running application is encapsulated in an additional layer of protection using dynamic binary ...

Virtualization has the potential to dramatically increase the usability and reliability of high performance computing (HPC) systems. However, this potential will remain unrealized unless overheads can be minimized. This is particularly challenging on ...

As virtualization trend is moving towards "client virtualization", wireless virtualization remains to be one of the technology gaps that haven't been addressed satisfactorily. Today's approaches are mainly developed for wired network, and are not ...

Symbiotic virtualization is a new approach to system virtualization in which a guest OS targets the native hardware interface as in full system virtualization, but also optionally exposes a software interface that can be used by a VMM, if present, to ...

With the intense competition between cloud providers, oversubscription is increasingly important to maintain profitability. Oversubscribing physical resources is not without consequences: it increases the likelihood of overload. Memory overload is ...

As virtualization becomes a key technique for supporting cloud computing, much effort has been made to reduce virtualization overhead, so a virtualized system can match its native performance. One major overhead is due to memory or page table ...

Memory access instrumentation is fundamental to many applications such as software transactional memory systems, profiling tools and race detectors. We examine the problem of efficiently instrumenting memory accesses in x86 machine code to support ...