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    Unless you pin VCPUs to CPUs (as seen by the OS), they can be executed on any physical CPU.
    – Daniel B
    Commented Mar 6, 2015 at 15:50
  • If you had 4 cores, and 4 VMs were using 1 core each, exclusively, then the world would implode since the host also needs CPU resources. ;) Anyhow, each VM will use multiple threads, even if they're using only one Core, so your question (as-is) is a little off-kilter, and doesn't really show any research effort.
    – Ƭᴇcʜιᴇ007
    Commented Mar 6, 2015 at 15:58
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    Related: Quad Core host with hyper-threading, how many processors to configure in VirtualBox?
    – Ƭᴇcʜιᴇ007
    Commented Mar 6, 2015 at 15:59