These generally offer things like live migration, memory sharing, and fault tolerance, and have less overhead. Your mileage may vary depending on your hardware and system configuration.įinally, if you're thinking of virtualizing a bunch of servers, consider a hypervisor based OS as your base rather than Linux, such as VMWare's ESXi, Microsoft's HyperV, or Xen. In my experience, performance in the various virtualization tools has been about the same everywhere, with a slight edge to VirtualBox and VMWare in comparison to the KVM. The KVM is completely open source, while only some parts of VirtualBox are. They're also both free, while VMWare costs ~$190.
VirtualBox and the Kernel Virtual Machine are much easier to get working because you don't have to compile a kernel driver. VMWare additionally has some limited 3D acceleration, integration with Eclipse debugging (lets you debug applications inside the VM from outside the VM), virtual networking features, multimonitor support, and record/replay functionality (useful for debugging concurrency problems - records on what core and in what sequence any instructions execute). VirtualBox (aka xVM), and VMWare support multiple snapshots, and "thin" cloning.
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