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[Author] Yoon-Young LEE(1hit)

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  • Dynamic File Prefetching Scheme Based on File Access Patterns in VIA-Based Parallel File System

    Yoon-Young LEE  Chei-Yol KIM  Dae-Wha SEO  

     
    PAPER-Computer Systems

      Vol:
    E85-D No:4
      Page(s):
    714-721

    A parallel file system is normally used to support excessive file requests from parallel applications in a cluster system, whereas prefetching is useful for improving the file system performance. This paper proposes dynamic file prefetching scheme based on file access patterns, named table-comparison prefetching policy, that is particularly suitable for parallel scientific applications and multimedia web services in a VIA-based parallel file system. VIA relieves the communication overhead of traditional communication protocols, such as TCP/IP. The proposed policy introduces a table-comparison method to predict data for prefetching. In addition, it includes an algorithm to determine whether and when prefetching is performed using the current available I/O bandwidth. Experimental results confirmed that the use of the proposed prefetching policy in a VIA-based parallel file system produced a higher file system performance for various file access patterns.