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This paper presents FT-GAIA, a software-based fault-tolerant parallel anddistributed simulation middleware. FT-GAIA has being designed to reliablyhandle Parallel And Distributed Simulation (PADS) models, which are needed toproperly simulate and analyze complex systems arising in any kind of scientificor engineering field. PADS takes advantage of multiple execution units run inmulticore processors, cluster of workstations or HPC systems. However, largecomputing systems, such as HPC systems that include hundreds of thousands ofcomputing nodes, have to handle frequent failures of some components. To copewith this issue, FT-GAIA transparently replicates simulation entities anddistributes them on multiple execution nodes. This allows the simulation totolerate crash-failures of computing nodes. Moreover, FT-GAIA offers someprotection against Byzantine failures, since interaction messages among thesimulated entities are replicated as well, so that the receiving entity canidentify and discard corrupted messages. Results from an analytical model andfrom an experimental evaluation show that FT-GAIA provides a high degree offault tolerance, at the cost of a moderate increase in the computational loadof the execution units.

Fault Tolerant Adaptive Parallel and Distributed Simulation through Functional Replication