查看文章

Checkpoint-Restart is the ability to save a set of running processes to a checkpoint image on disk, and to later restart them from the disk. In addition to its traditional use in fault tolerance, recovering from a system failure, it has numerous other uses, such as for application debugging and save/restore of the workspace of an interactive problem-solving environment. Transparent checkpointing operates without modifying the underlying application program, but it implicitly relies on a" Closed World Assumption"—the world (including file system, network, etc.) will look the same upon restart as it did at the time of checkpoint. This is not valid for more complex programs. Until now, checkpoint-restart packages have adopted ad~ hoc solutions for each case where the environment changes upon restart.