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首页> 外文期刊>Journal of network and computer applications >An integrated prefetching/caching scheme in multimedia servers
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An integrated prefetching/caching scheme in multimedia servers

机译：多媒体服务器中的集成预取/缓存方案

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摘要

Advances in storage and networking technologies have made on-demand multimedia services prevalent these days. To provide numerous concurrent users with such high-quality services, it is essential for storage systems to support sufficient I/O bandwidth for delivering multimedia data on time. Two data buffering techniques, prefetching and interval caching, have improved I/O performance by keeping data blocks in memory for future accesses when handling multimedia data with sequential access patterns. However, they have been addressed separately since it is challenging to determine whether it is better to prefetch or to cache each new stream depending on specific situations. Prefetching too many blocks or caching too long intervals may exhaust the cache space quickly. In this paper, we propose a scheme, called Integrated Prefetching/Caching (IPC), to simultaneously take benefit of both prefetching and interval caching using dynamic threshold values. The IPC schedules incoming streaming requests so that utilization of both cache space and disk bandwidth can be maximized. As a result, the IPC can continue to improve the performance without saturation as system resources are added. By simulation experiments, we show that IPC increases the number of concurrent streams significantly, compared to when either prefetching or caching is employed alone.
机译：近来，存储和网络技术的发展已使按需多媒体服务盛行。为了向众多并发用户提供这种高质量的服务，存储系统必须有足够的I / O带宽来按时交付多媒体数据，这一点至关重要。当使用顺序访问模式处理多媒体数据时，预取和间隔缓存这两种数据缓冲技术通过将数据块保留在内存中以供将来访问，从而提高了I / O性能。但是，由于要根据特定情况确定预取还是缓存每个新流比较好，因此具有挑战性，因此已分别解决了它们。预取太多块或缓存时间间隔过长可能会很快耗尽缓存空间。在本文中，我们提出了一种称为集成预取/缓存（IPC）的方案，以同时利用动态阈值同时利用预取和间隔缓存。 IPC计划传入的流请求，以便可以最大程度地利用缓存空间和磁盘带宽。结果，随着添加系统资源，IPC可以继续提高性能而不会出现饱和。通过仿真实验，我们发现与单独使用预取或缓存相比，IPC显着增加了并发流的数量。

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