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I can say an image with sbcl (lisp implementation) with a load of functions and libraries. I can't save an image with python, ruby and javascript.



You can checkpoint at a lower level https://en.m.wikipedia.org/wiki/Application_checkpointing or using a virtual machine.

But in practice it's not that useful to checkpoint a running program because of external state. You can't checkpoint sockets when they are connected to some other machine.




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