Execution Replay of Parallel Programs

Debugging MIMD programs is often a delicate job. As a matter of fact, they can have different behaviors in successive executions. So, cyclic debugging is not applicable. To make it available for parallel programmers, we propose execution replay (full and partial) for our multi-threaded execution model, the Communicating Active Components (CAC). CAC/s have been defined to implement Parallel Object Oriented Languages. This work is part of the PVC/BOX project which goal is a full parallel object oriented environment. Execution replay mechanism is the basic tool for usable parallel debugging tools building. 1 Introduction Last years, hardware components have made great progress. Now, very powerful architectures and especially multicomputers made of many processors are available. The programming of these machines is often a delicate job, even for expert programmers. The need of efficient and powerful tools to support debugging is very important. Advanced tools exist for sequential programm..