Abstract. In this paper, we propose a low overhead replication scheme for the fault-tolerant mobile agent system. In the proposed lazy replication scheme, execution of a primary agent and migration of its replicas are concurrently processed . Also, the primary agent perforrns asynchronaus consensus with fixed consensus agents so that the consensus step and the replica migration step can concurrently be processed. As a result, the primary agent should not wait for the completion of the replica migration step unless any of the consensus agents fails. The proposed scheme has been implemented on top of the Aglet system and its performance has been measured.
This paper evaluares the performance of checkpoinring and replicarion schemes for rhe fault roleranr mobile agenr sysrem. For the quanrirative comparison. we have implemented an experimenral sysrem on rap of rhe Mole mobile ngenr sysrem and also builr a simulation sysrem ro include various failure cases. Our experiment aims ro have rhe insighr inro rhe behavior of agents under two schemes and provide a guideline forrhe faulr roleranr system design. The experimenrol resulrs show rhat rhe checkpoinring scheme shows a very srable perjormance; and for rhe replication scheme, some conrrollable sysrem paramerer values should be chosen carefully to achieve rhe desirable pe!foformance.
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