On-the-Fly Replay: A Practical Paradigm and Its Implementation for Distributed Debugging

: This paper presents a practical paradigm, called on-the-fly replay. This paradigm consists of running a distributed program twice at the same time: an original computation driving a twin execution whose non-deterministic choices have not to be evaluated. This paradigm has several interesting uses. Among them, distributed debugging is particularly noteworthy. The integration of this paradigm into a distributed debugging facility, called EREBUS, is described. This implementaton was run on a distributed memory parallel machine (Intel Hypercube iPSC2) and experimental results, showing gains provided, are exhibited. Key-words: Distributed debugging, Execution replay, Probe effect, Measurements (R'esum'e : tsvp) This work has been partly supported by a cooperation grant from French and Israeli goverments. Computer Science Department - Technion Haifa 32000 ISRAEL IRISA - Email address: !name?@irisa.fr Unite de recherche INRIA Rennes IRISA, Campus universitaire de Beaulieu, 35042 RENNES ..