saving tcp connection info does you no good unless the other end of the tcp connection gets checkpointed at the same instant.
saving pending disk writes does no good if the file you are writing to is off on some other system and will contain writes after the checkpoint
system level c/r is useful for planned outages, but when you are in HPC environments, you have enough nodes that this is really not good enough, you will have unplanned outages, and unless your c/r can back out all these other side effects, it's not going to be able to be used for these outages.
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