Anthony Liguori

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Virtualization is a hot topic in operating systems these days. It is useful in many scenarios: server consolidation, virtual test environments, and for Linux enthusiasts who still can not decide which distribution is best. Recently, hardware vendors of commodity x86 processors have added virtualization extensions to the instruction set that can be utilized(More)
In classical machine virtualization, a hypervisor runs multiple operating systems simultaneously, each on its own virtual machine. In nested virtualization, a hypervisor can run multiple other hypervisors with their associated virtual machines. As operating systems gain hypervisor functionality—Microsoft Windows 7 already runs Windows XP in a virtual(More)
Efficiently managing storage is important for virtualized computing environments. Its importance is magnified by developments such as cloud computing which consolidate many thousands of virtual machines (and their associated storage). The nature of this storage is such that there is a large amount of duplication between otherwise discreet virtual machines.(More)
The extent to which caffeine antagonizes alcohol-induced impairment of simulated automobile driving at the current lowest legal American limit (0.08% BrAC) was the focus of this study. Fifteen adults swallowed a capsule (0, 200, or 400 mg caffeine) then drank a beverage (0.0 or 0.6 g/kg ethanol) in a within-subject, double-blind, randomized procedure.(More)
Abstract Rationale . Marijuana and alcohol, when used separately and in combination, contribute to automobile accidents and failed sobriety tests of standing balance. However, the extent to which the drugs have additive effects on both of these measures is unknown. Objectives . This study was designed to compare directly the separate and combined effects of(More)
Delta-9-tetrahydrocannabinol (THC) is frequently found in the blood of drivers involved in automobile accidents, and marijuana use has been associated with impaired field sobriety test performance. The present study used a within-subject design to compare the effects of marijuana (0, 1.77, or 3.95% THC) on equilibrium and simulated driving. Ten marijuana(More)
BACKGROUND Investigations into tanners' reasons for tanning have focused primarily on the perception of improved appearance. Reported relaxing effects of tanning suggest the possibility of a physiologic effect of UV that drives tanning behavior. OBJECTIVE We sought to determine if there is a physiologic reinforcing effect of UV exposure, separate from(More)
This paper describes the design and implementation of a paravirtualized file system interface for Linux in the KVM environment. Today’s solution of sharing host files on the guest through generic network file systems like NFS and CIFS suffer from major performance and feature deficiencies as these protocols are not designed or optimized for virtualization.(More)
RATIONALE Chronic marijuana use has been associated with impairments of learning, memory, and executive functions. Little is known, however, about the effects of marijuana use on other cognitive domains, such as decision-making, which are thought to play an important role in addiction and drug abuse. OBJECTIVES The purpose of the present study was to(More)
BACKGROUND The effects of alcohol on simple versus complex psychomotor performance were compared in 18 adults. METHODS Subjects received ethanol doses of 0.0, 0.5, and 0.8 g/kg in a randomized, double-blind, within-subject design. Forty minutes after finishing their drinking, the subjects completed a 60-min battery of tests that included: 1) a sensory(More)