Energy efficiency of handheld computer interfaces: limits, characterization and practice
Energy efficiency of handheld computer interfaces: limits, characterization and practice
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DOI：
10.1145/1067170.1067197
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发表时间：
2005-06
期刊：
影响因子：
--
通讯作者：
Lin Zhong;N. Jha
中科院分区：
文献类型：
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作者：
Lin Zhong;N. Jha
能源效率已成为电池驱动计算机的一个关键问题。为了通过更好的软件和硬件来改进它，我们投入了大量的工作。然而，人为因素和用户界面常常被忽视。认识到它们的极端重要性，我们致力于全面探讨它们在确定和提高能源效率方面的作用。我们分析了已知的人类感官/速度限制所带来的最低能量需求和开销。然后，我们描述了两台商用手持计算机上可用的最先进接口的能源效率。基于这些特征，我们对它们进行了比较研究。即使拥有完美的用户界面，由于用户与计算机之间的交互速度差距越来越大，计算机仍然会花费大部分时间和精力等待用户响应。这样的速度差距导致系统能效出现瓶颈。我们提出了一种低功耗、低成本的缓存设备，主机可以将简单的任务外包给它，作为克服瓶颈的接口解决方案。我们讨论了用作接口缓存设备的低功耗无线手表的设计和原型实现。通过这项工作，我们希望引起移动系统设计界对研究用户界面对系统能效的影响的更多兴趣，并抓住由此带来的机会。
Energy efficiency has become a critical issue for battery-driven computers. Significant work has been devoted to improving it through better software and hardware. However, the human factors and user interfaces have often been ignored. Realizing their extreme importance, we devote this work to a comprehensive treatment of their role in determining and improving energy efficiency. We analyze the minimal energy requirements and overheads imposed by known human sensory/speed limits. We then characterize energy efficiency for state-of-the-art interfaces available on two commercial handheld computers. Based on the characterization, we offer a comparative study for them.Even with a perfect user interface, computers will still spend most of their time and energy waiting for user responses due to an increasingly large speed gap between users and computers in their interactions. Such a speed gap leads to a bottleneck in system energy efficiency. We propose a low-power low-cost cache device, to which the host computer can outsource simple tasks, as an interface solution to overcome the bottleneck. We discuss the design and prototype implementation of a low-power wireless wrist-watch for use as a cache device for interfacing.With this work, we wish to engender more interest in the mobile system design community in investigating the impact of user interfaces on system energy efficiency and to harvest the opportunities thus exposed.