软件DSM(distributed shared memory)系统在机群上构造了共享存储编程环境,结合了共享存储的易编程性和机群的可扩展性,引起了广泛的研究.由于软件DSM系统是一个分布式系统,系统失败风险大,需要实现容错技术以促进其实用化.利用用户级检查点技术,在支持域存储一致模型的软件DSM系统JIAJIA的基础上,设计并实现了一个可恢复的高可移植的软件DSM系统JIACKPT(JIAjia with ChecKPoinTing).由于采用适合软件DSM系统的强全局一致状态以及多种优化措施,JIACKPT易于实现且获得很好的性能.在一个8节点的PC机群上的应用测试表明,即使每分钟做一次检查点,大部分应用的检查点开销也小于10%.此外,JIACKPT还具有高可移植性.这些都表明JIACKPT已经成为一个比较实用的系统.

Software distributed shared memory (DSM) system has constructed a virtual shared memory abstract on cluster, which combines the programmability of shared memory and fine scalability of cluster. So it is widely studied. Software DSM system is easy to fail because it is a distributed system, some kinds of fault tolerance are necessary for it to be more practical. A recoverable and portable software DSM system, JIACKPT (JIAjia with ChecKPoinTing), has been designed and implemented to tolerate the fault of system. JIACKPT, based on JIAJIA, has adopted the checkpointing technology. By maintaining the strict global consistent state and using some optimization techniques, JIACKPT has gotten high performance. The experimental results on an 8-node PC cluster show that the checkpoint overhead is less than 10% of the whole execution time when checkpoint is done once per minute. JIACKPT also has good portability and can run on several operating systems, such as Linux, Solaris, etc. JIACKPT is a practical recoverable software DSM system.

Supported by the National Natural Science Foundation of China under Grant No.60303016(国家自然科学基金)