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What is Virtual Machine in OS- System virtual machines & Full virtualization

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What is Virtual Machine in OS- System virtual machines & Full virtualization What is Virtual Machine in OS- System virtual machines & Full virtualization

What is Virtual machine

What is Virtual Machine in OS

A virtual machine (VM) is a copying of a PC framework. Virtual machines depend on PC structures and give the usefulness of a physical PC. Their usage may include specific equipment, programming, or a blend. 

There are various types of virtual machines, each with various capacities. Framework virtual machines (likewise named full virtualization VMs) give a substitute to a genuine machine. They give the usefulness expected to execute whole working frameworks. 

What is Virtual Machine in OS


A hypervisor utilizes local execution to share and oversee equipment, taking into consideration numerous conditions which are segregated from each other, yet exist on the equivalent physical machine. Current hypervisors use equipment helped virtualization, virtualization-explicit equipment, fundamentally from the host CPUs. Procedure virtual machines are intended to execute PC programs in a stage free condition. 

Some virtual machines, for example, QEMU, are intended to likewise copy various structures and permit the execution of programming applications and working frameworks composed for another CPU or design. Working framework level virtualization enables the assets of a PC to be divided by means of the portion's help for different disconnected client space examples, which are normally called compartments and may closely resemble genuine machines to the end clients.

System virtual machines

The desire to run multiple operating systems was the initial motive for virtual machines, so as to allow time-sharing among several single-tasking operating systems. In some respects, a system virtual machine can be considered a generalization of the concept of virtual memory that historically preceded it. IBM's CP/CMS, the first systems to allow full virtualization, implemented time sharing by providing each user with a single-user operating system, the Conversational Monitor System (CMS). 

Unlike virtual memory, a system virtual machine entitled the user to write privileged instructions in their code. This approach had certain advantages, such as adding input/output devices not allowed by the standard system.

As technology evolves virtual memory for purposes of virtualization, new systems of memory overcommitment may be applied to manage memory sharing among multiple virtual machines on one computer operating system. It may be possible to share memory pages that have identical contents among multiple virtual machines that run on the same physical machine, what may result in mapping them to the same physical page by a technique termed Kernel SamePage Merging. 

This is especially useful for read-only pages, such as those holding code segments, which is the case for multiple virtual machines running the same or similar software, software libraries, web servers, middleware components, etc. The guest operating systems do not need to be compliant with the host hardware, thus making it possible to run different operating systems on the same computer (e.g., Windows, Linux, or prior versions of an operating system) to support future software.

The use of virtual machines to support separate guest operating systems is popular with regard to embedded systems. A typical use would be to run a real-time operating system simultaneously with a preferred complex operating system, such as Linux or Windows. Another use would be for novel and unproven software still in the developmental stage, so it runs inside a sandbox. Virtual machines have other advantages for operating system development and may include improved debugging access and faster reboots.

Full virtualization

In full virtualization, the virtual machine simulates enough hardware to allow an unmodified "guest" OS (one designed for the same instruction set) to be run in isolation. This approach was pioneered in 1966 with the IBM CP-40 and CP-67, predecessors of the VM family.

Examples outside the mainframe field include Parallels Workstation, Parallels Desktop for Mac, VirtualBox, Virtual Iron, Oracle VM, Virtual PC, Virtual Server, Hyper-V, VMware Workstation, VMware Server (discontinued, formerly called GSX Server), VMware ESXi, QEMU, Adeos, Mac-on-Linux, Win4BSD, Win4Lin Pro, and Egenera blade technology.

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NETechy: What is Virtual Machine in OS- System virtual machines & Full virtualization
What is Virtual Machine in OS- System virtual machines & Full virtualization
What is Virtual Machine in OS- System virtual machines & Full virtualization What is Virtual Machine in OS- System virtual machines & Full virtualization
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