| Author | E. Deelman and B. K. Szymanski |
|---|---|
| Title | Breadth First Rollback in Parallel Discrete Event Simulations |
| Year | 1997 |
| Journal | ACM Transactions on Modeling and Computer Simulation |
| Volume | - - |
| Pages | 124-131 |
| Abstract | The efficiency of Parallel Discrete Event Simulations that use the optimistic protocol is strongly dependent on the overhead incurred by rollbacks. This paper introduces a novel approach to rollback processing which limits the number of events rolled back as a result of a straggler or antimessage. The method, called Breadth-First Rollback (BFR), is suitable for spatially explicit problems where the space is discretized and distributed among processes and simulation objects move freely in the space. The BFR uses incremental state saving, allowing the recovery of causal relationships between events during rollback. These relationships are the used to determine which events need to be rolled back. This paper presents an application of BFR to the simulation of Lyme disease. The results demonstrate an almost linear speedup-a dramatic improvement over the traditional approach to rollback processing. |
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