Good point about Tandem, but it wasn't limited to them. Checkpoint/restart has also long been a high-end capability found in HPC (High Performance Computing) s

Good point about Tandem, but it wasn't limited to them. Checkpoint/restart has also long been a high-end capability found in HPC (High Performance Computing) systems. I recall it even it made it onto some commercial UNIXes, although I don't remember whether it was bundled in or took the form of some additional layered software such as LSF (Load Sharing Facility) (example: https://www.ibm.com/docs/en/spectrum-lsf/10.1.0?topic=administration-job-checkpoint-restart https://www.ibm.com/docs/en/spectrum-lsf/10.1.0?topic=admini... ). There are some people who have tried to bring some checkpoint/restart to Linux. For example, see the CRIU project: https://criu.org/Checkpoint/Restore https://criu.org/Checkpoint/Restore I acknowledge that the original poster is talking about all this being done at the application level, not outside-the-app at the OS level... For more references on the topic, see the wikipedia entry for Application checkpointing: https://en.wikipedia.org/wiki/Application_checkpointing https://en.wikipedia.org/wiki/Application_checkpointing