Electricity is a major cost in running a data centre, and servers are responsible for a significant percentage of the power consumption. Given the widespread use of HTTP, both as a service and a component of other services, it is worthwhile reducing the power consumption of web servers. In this paper we consider how reverse proxies, commonly used to improve the performance of web servers, might be used to improve energy efficiency. We suggest that when demand on a server is low, it may be possible to switch off servers. In their absence, an embedded system with a small energy footprint could act as a reverse proxy serving commonly-requested content. When new content is required, the reverse proxy can power on the servers to meet this new load. Our results indicate that even with a modest server, we can get a 25% power saving while maintaining acceptable performance.

中文翻译：

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Web服务器的节能代理

电力是运行数据中心的主要成本，而服务器则占很大一部分功耗。考虑到HTTP作为服务和其他服务的组成部分的广泛使用，值得减少Web服务器的功耗。在本文中，我们考虑了通常用于提高Web服务器性能的反向代理如何用于提高能源效率。我们建议，当服务器需求低时，可以关闭服务器。在没有它们的情况下，具有较小能源足迹的嵌入式系统可以充当反向代理，以服务于常见的内容。当需要新的内容时，反向代理可以打开服务器电源来满足此新负载。我们的结果表明，即使使用适度的服务器，