面向内存文件系统的数据一致性更新机制研究

近年来,研究界提出了多种管理新型存储级内存的内存文件系统,例如BPFS,PMFS和SIMFS。由于内存文件系统的设备访问方式和I/O路径不同于传统面向块设备的文件系统,适用于内存文件系统的数据一致性更新机制尚未得到很好的研究。为此,提出一种适用于内存文件系统的直接拷贝的数据一致性更新机制,讨论多种数据一致性更新机制在内存文件系统中的优缺点,并以内存文件系统SIMFS为基础,实现多种支持不同数据一致性更新机制的SIMFS版本。通过测试基准测试了各个SIMFS版本的性能,并分析了不同数据一致性更新机制对内存文件系统的整体性能的影响。实验结果表明,提出的直接拷贝机制在内存文件系统中取得了最好的性能。

Research on Data Consistency for In-memory File Systems

In recent years,many research works have proposed new in-memory file systems to manage storage class memory (SCM),such as BPFS,PMFS and SIMFS.Since the in-memory data access is different from traditional I/O path of block-based file systems,the data consistency mechanisms are not well studied for in-memory file systems.Thus,a new consistency mechanism called direct copying was presented for in-memory file systems.The pros and cons when different consistency strategies are used in in-memory file systems were discussed.Then,different consistency mechanisms were implemented in SIMFS to test the effectiveness of the proposed methods.Finally,experiments were conducted with standard benchmark to measure the performance of different consistency mechanisms.The experimental results show that the proposed direct copying method outperforms other strategies.