When comparing OSv vs ClickOS, the Slant community recommends OSv for most people. In the question“What are the best unikernels?” OSv is ranked 3rd while ClickOS is ranked 5th. The most important reason people chose OSv is:
OSv is able to boot in less than a second.
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Pros
Pro Quick booting
OSv is able to boot in less than a second.
Pro Amazing performance
Since OSv is created to run one single application on top of a hypervisor, it offers great performance and speed.
Pro Supports multiple platforms
OSv can run applications written in multiple programming languages and that run on multiple different platforms. Such as Java, C, Ruby, Node and Scala. With support for other languages on the way.
Pro Can run a large number of instances concurrently and cheaply
More than 100 instances of ClickOS can be run concurrently while saturating only a 10GB pipe on an inexpensive server.
Pro Great performance
Benchmarks have shown that ClickOS has great performance. It boots quickly (averages at about 20milliseconds) and has very little delay (about 45 microseconds).
Cons
Con Can only run one application at a time
Since it tries to have maximum performance, OSv can only afford to run one application per hypervisor at a time.
Con Has some complexity added because it's not based on a language with process isolation
Since C and C++ (with which ClickOS is built) have no language level isolation, ClickOS doesn't have process isolation either. Because of this, sensitive components have to be split into different nodes, isolated by either different virtual machines or different computers.