Linked by David Haring on Thu 15th Apr 2004 21:14 UTC
Imagine this scenario: you need to run your favorite application under Linux but the application has not been ported to Linux yet and there is no other alternative that would completely suit your needs. Or you need to work with several operating systems.
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Actually VMWARE ESX server does this exact thing. They still emulate most of the hardware but instead of having a host os you use their lightweight os. One really cool thing they do is they will compare pages in physical memory and if two diferent guest OS's having two identical memory pages they map them both two one physical page. This is really cool if you are running say four copies of windows on a machine and all of the dll's are only in physical memory once for all four guests. They also do some other cool things like virtual SMP and the ability to move guests from one box to another wthout shutting down the guest.