Raj Kumar Computer Science And Engineering

Hardware Virtualization Techniques

Explanation

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Operating System Level Virtualization

To create different and separated execution environments for applications that are managed concurrently.
There is no virtual machine manager or hypervisor, and the virtualization is done within a single operating system.
OS kernel allows for multiple isolated user space instances.
chroot mechanism in Unix systems. The chroot operation changes the file system root directory for a process and its children to a specific directory.
The process and its children cannot have access to other portions of the file system.

Programming language-level virtualization

To achieve ease of deployment of applications, managed execution, and portability across different platforms and operating systems.
It consists of a virtual machine executing the byte code of a program, which is the result of the compilation process.
Generally these virtual machines constitute a simplification of the underlying hardware instruction set and provide some high-level instructions that map some of the features of the languages compiled for them.
Basic Combined Programming Language
Both Java and the CLI are stack-based virtual machines.

Application-level virtualization

Such emulation is performed by a thin layer - a program or an operating system component that is in charge of executing the application.
Interpretation - In this technique every source instruction is interpreted by an emulator for executing native ISA instructions, leading to poor performance.
Binary translation - In this technique every source instruction is converted to native instructions with equivalent functions. After a block of instructions is translated, it is cached and reused.
SaaS utilizes application-level virtualization to deploy the application