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Operating-system-level virtualization usually imposes less overhead than full virtualization because programs in OS-level virtual partitions use the operating system's normal system call interface and do not need to be subjected to emulation or be run in an intermediate virtual machine, as is the case with full virtualization (such as VMware ...
Platform virtualization allows more leverage to the developer as anything that relates to the guest operating system only affects the guest operating system, and not the host operating system. Due to this it is possible for the guest operating system to be rooted, where as the host operating system remains unrooted.
OpenVZ (Open Virtuozzo) is an operating-system-level virtualization technology for Linux. It allows a physical server to run multiple isolated operating system instances, called containers, virtual private servers (VPSs), or virtual environments (VEs). OpenVZ is similar to Solaris Containers and LXC.
A virtual machine implements functionality of a (physical) computer with an operating system. The software or firmware that creates a virtual machine on the host hardware is called a hypervisor or virtual machine monitor. [2] Software executed on these virtual machines is separated from the underlying hardware resources.
A virtual machine (VM) can be more easily controlled and inspected from a remote site than a physical machine, and the configuration of a VM is more flexible. This is very useful in kernel development and for teaching operating system courses, including running legacy operating systems that do not support modern hardware. [8]
There are many apps in Android that can run or emulate other operating systems, via utilizing hardware support for platform virtualization technologies, or via terminal emulation. Some of these apps support having more than one emulation/virtual file system for different OS profiles, thus the ability to have or run multiple OS's.
[8] [9] For some guest operating systems, a "Guest Additions" package of device drivers and system applications is available, [10] [11] which typically improves performance, especially that of graphics, and allows changing the resolution of the guest OS automatically when the window of the virtual machine on the host OS is resized.
The virtual machines supported unmodified guest operating systems and standalone programs such as Microsoft Flight Simulator; but in typical usage the guest was MS-DOS with a Locus proprietary redirector (also marketed for networked PCs as "PC-Interface") and a "network" driver that provided communication with a regular user-mode file server ...