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When you give a guest OS multiple virtual CPUs (vCPU), the virtual machine has to assign them to physical CPUs (pCPU). I can't find any info on how most VMs handle this. There are 2 broad categories: strict co-scheduling (also called gang scheduling), and relaxed co-scheduling. I'm pretty sure VMware ESXi and MS Hyper-V use relaxed.

Does anyone know about any others?

  1. VMware Workstation or Fusion
  2. Parallels Desktop
  3. Xen
  4. VirtualBox
  5. KVM

and any others that I may have missed...

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closed as too broad by LawrenceC, DavidPostill, mdpc, Simon, Kevin Panko May 29 '15 at 23:06

There are either too many possible answers, or good answers would be too long for this format. Please add details to narrow the answer set or to isolate an issue that can be answered in a few paragraphs.If this question can be reworded to fit the rules in the help center, please edit the question.