LEAP: Lightweight deterministic multi-processor replay of concurrent Java programs

The technique of deterministic record and replay aims at faithfully reenacting an earlier program execution. For con-current programs, it is one of the most important techniques for program understanding and debugging. This demo presents LEAP: an efficient technique as well as a tool prototype to deterministically replay concurrent Java programs on multi-processors without any changes to the host’s environment. During execution, LEAP records the thread access orders w.r.t. each shared memory location. The same thread ac-cess orders are then enforced in the replay execution to drive the program to the same states. The replay determinism of this approach is underpinned by formal models and a replay theorem developed in this work. Compared to the related approaches, LEAP records much less information, and thus much more efficient