ACM Queue posted an article titled "Unikernels: Rise of the Virtual Library Operating System", written by the main developers of MirageOS. The article is a good overview of the motivation and design of Mirage, which is a specialized lightweight hypervisor guest operating system for Xen. It's developed in OCaml and benefits from its features like memory safety, module system and compiler optimisations. It's comparable to OSv on many fronts.
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