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When you give a guest multiple virtual CPUs (vCPU) the virtual machine has to assign them to physical CPUs (pCPU). I'm 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

any others I missed...

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