Coherence-based Coordinated Checkpointing for Software Distributed Shared Memory Systems

Fault-tolerant techniques that can cope with system failures in software distributed shared memory (SDSM) are essential for creating productive and highly available parallel computing environments on clusters of workstations. In this paper, we propose a new, efficient coordinated checkpointing technique, called coherence-based coordinated checkpointing (CCC), for SDSM. Our CCC minimizes both the checkpointing overhead during failure-free execution and the cost of recovery from failures by leveraging existing coherence information maintained by SDSM. In the presence of system failures, it allows SDSM to recover from the most recent checkpoint, saving the re-computation time. We have performed experiments on a cluster of eight Sun Ultra-5 workstations, comparing our CCC technique against both simple coordinated checkpointing (SCC) and incremental coordinated checkpointing (ICC) techniques by actually implementing these techniques in TreadMarks, a state-of-the-art SDSM system. The experimental results demonstrate that our CCC technique consistently outperforms both SCC and ICC techniques. In particular, our technique increases the execution time slightly by 0.5% to 4% for a 2-minute checkpointing interval during failurefree execution, while SCC and ICC techniques result in the execution time overhead of 4% to 100% and 3% to 64%, respectively, for the same checkpointing interval.