WOB:一种新的文件检查点设置策略  

WOB:A Novel Approach to Checkpoint Active Files

作　　者：裴丹[1] 汪东升[1] 沈美明[1] 郑纬民[1] 

机构地区：[1]清华大学计算机系,北京100084

出　　处：《电子学报》2000年第5期9-12,共4页Acta Electronica Sinica

基　　金：国家高技术计划 863!(No .863 30 6 2D0 1 0 2 0 1 );国家基础研究!(No .G1 9990 32 70 2 )

摘　　要：实现分布 /并行系统容错的基础是单进程检查点设置和卷回恢复技术 ,而对进程活动文件状态进行保存和恢复则是这种技术的重要方面 .本文提出的延迟写策略 ,实现了对用户文件的检查点设置 ,有效地解决了在发生故障时用户文件内容与进程全局状态的不一致问题 .它对用户通明 ,并且通过优化设置内存缓冲区大小、时延隐藏等手段 ,使得这种策略在空间开销、正常运行时间、恢复时间等性能指标上优于其它方法 .Checkpointing and rollback recovery of Unix process is the underlying technique of fault tolerance of distributed system and parallel environment.To save and restore the state of active file of the process is an important aspect of checkpointing and rollback recovery.This paper presents an approach called Write Operation Buffering to support this capability.WOB approach buffers all the write operations after a checkpoint until the next one,making all the operations between two checkpoints atomic as a whole.By choosing a suitable size dynamically for memory buffer,and by hiding the latency of flushing the buffer,the WOB approach achieves an overhead lower than other approaches.

关 键 词：检查点设置 卷回恢复 WOB 文件 容错 

分 类 号：TP362.8[自动化与计算机技术—计算机系统结构]