@Roger Ramjet There are benchmarks on this. 3% - 5% hit vs native for HyperVisors is typical.
VMs provide isolation in ways that processes do not. Plus you can move a VM around from physical machine to physical machine as needed in fact it can happen in the background automatically. And it allows running of multiple OSes. Provisioning a new server or servers can take minutes.
The alternative is to have a single big Unix box that runs all the servers as processes. But in this case you don't have the same degree of isolation, you can't run multiple OSes (and some people really want to do that) and if your box has a problem you can't seamlessly move the processes somewhere else.
As for your example that's so old. a 3.0 Liter today can achieve over 300 hp with more stuff than ever and still have a vehicle with more mpg.
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