Transparent checkpoints of closed distributed systems in Emulab
Anton A. Burtsev, Prashanth Radhakrishnan, Mike Hibler, Jay Lepreau · 2009
Emulab is a testbed for networked and distributed systems experimentation. Two guiding principles of its design are realism and control of experimentation. There is an inherent tension between these goals, however, and in some aspects of the testbed's design, Emulab's implementers favored realism over control. Thus, Emulab provides wide-ranging control over an experiment's environment and initial conditions, but relatively little control over its execution--in particular, the ability to suspend, preempt, or replay the experiment.