Virtualization systems (and Xen in particular) are implementing the ability to configure the number of (virtual) CPUs in each running instance on the fly, in response to the load on each. So it may really be that a busy, virtualized server will have CPUs hot-plugged into it, and that those processors will go away when the load drops.
Why bother with hotplugging virtual processors? Isn't it simpler to add more resources (e.g. more CPU splices per second) on the host to the particular virtualized server?
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