基于提示的Web代理缓存加速

D. Roşu, A. Iyengar, D. Dias
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引用次数: 11

摘要

大量研究表明,代理缓存缺失率通常至少为40%-50%。本文提出并评估了一种通过减少缓存丢失开销来提高代理缓存吞吐量的新方法。嵌入式系统能够实现比传统代理更好的通信性能,过滤定向到代理缓存的请求,将命中的转发给代理,并自行处理未命中的请求。这个系统被称为代理加速器,使用代理缓存内容的提示,并可能包括一个用于最热对象的主内存缓存。Web代理集群大小的可伸缩性是通过使用几个加速器来实现的。我们使用分析模型和基于跟踪的模拟来研究这种新方法的优点和实现折衷。在四节点Web代理前增加一个代理加速节点,可提高约40%的性价比。不影响总体命中率的实现选择是可用的。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Hint-based acceleration of Web proxy caches
Numerous studies show that proxy cache miss ratios are typically at least 40%-50%. This paper proposes and evaluates a new approach for improving the throughput of proxy caches by reducing cache miss overheads. An embedded system able to achieve significantly better communications performance than a traditional proxy filters the requests directed to a proxy cache, forwarding the hits to the proxy and processing the misses itself. This system, called a Proxy Accelerator, uses hints of the proxy cache content and may include a main memory cache for the hottest objects. Scalability with the Web proxy cluster size is achieved by using several accelerators. We use analytical models and trace-based simulations to study the benefits and the implementation tradeoffs of this new approach. A single proxy accelerator node in front of a four-node Web proxy improves the cost-performance ratio by about 40%. Implementation choices that do not affect the overall hit ratio are available.
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