OSv has preemptive multi-tasking. Unikernels are more about having your application run in kernelspace, and recognizing that in distributed computing contexts,

OSv has preemptive multi-tasking. Unikernels are more about having your application run in kernelspace, and recognizing that in distributed computing contexts, individual computers tend to be only doing one thing, and having them doing other things reduces efficiency and decreases complexity.