Question

Define virtual displacement? explain the principle of virtual work?​

Answer 1

In analytical mechanics, a branch of applied mathematics and physics, a virtual displacement δrᵢ "is an assumed infinitesimal change of system coordinates occurring while time is held constant. It is called virtual rather than real since no actual displacement can take place without the passage of time."

thanks

Answer 2

priya

Ace

Hi mate

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The concept is to use a part of the host’s or the main resource to provide an isolated environment for the new system. That is, for a virtual machine with 1GB memory requirement, 1 core of processor assigned, 1 core of graphic card assigned, etc the new ones would suck the power out of the main resources.

The assignment of resources is absolute. For example, if the virtual machine is assigned 1 GB of memory and uses of 50% of that 1 GB at a time, the remaining 50% will be useless and it would be a waste of resource. There is no way to utilise that 50% in case of virtualisation. Same applies for each and every resource.

This results in degradation of main systems performance. No matter how highly configured the system is, there will always be a certain %age of resource wastage in virtualisation.

This does not mean virtualisation is the worst. They are useful for small scale business or home PC geeks, but again, with host degradation and resource wastage. Virtual Machines played an important role in IaaS cloud services.

Currently, we have come up with better alternatives, i.e. Containers and Dockersthat have abandoned emulation, dealing with machines on kernel level