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首页> 外文会议>Symposium on Mass Storage Systems and Technologies >An Overlay File System for cloud-assisted mobile applications
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An Overlay File System for cloud-assisted mobile applications

机译：用于云辅助移动应用程序的覆盖文件系统

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摘要

With cloud assistance, a mobile application can offload its resource-demanding computation tasks to the cloud (public cloud, cloudlet, or personal cloud, etc). This leads to a scenario where computation tasks in the same application run concurrently on both the mobile device and the cloud. These tasks need to save, read, and write files on both the mobile device and the cloud. An important challenge is to ensure that the tasks are able to access and share the files in a manner that is efficient, consistent, and transparent to locations. The paper addresses this issue by designing an application-level file system called Overlay File System (OFS). To improve efficiency, OFS maintains and buffers local copies of data sets on both the cloud and the mobile device. OFS ensures consistency and guarantees that all the reads get the latest data. It combines write-invalidate and write-update policies to effectively reduce the network traffic incurred by invalidating/updating stale data copies and to reduce the application delay when the latest data cannot be accessed locally. To guarantee location transparency, OFS creates an unified view of the data that is location independent and is accessible as local storage. Our experiments show that OFS can effectively support task offloading and efficient execution of offloaded tasks by significantly decreasing both file access latency and network traffic incurred by file accesses.
机译：借助云技术，移动应用程序可以将其资源需求计算任务转移到云（公共云，cloudlet或个人云等）上。这导致了一个场景，即同一应用程序中的计算任务在移动设备和云上同时运行。这些任务需要在移动设备和云上保存，读取和写入文件。一个重要的挑战是确保任务能够以高效，一致且对位置透明的方式访问和共享文件。本文通过设计称为覆盖文件系统（OFS）的应用程序级文件系统来解决此问题。为了提高效率，OFS在云和移动设备上都维护和缓冲数据集的本地副本。 OFS确保一致性，并确保所有读取均获得最新数据。它结合了写入无效和写入更新策略，可有效减少因无效/更新陈旧数据副本而引起的网络流量，并减少无法在本地访问最新数据时的应用程序延迟。为了保证位置的透明性，OFS为数据创建了一个统一的视图，该视图与位置无关，可以作为本地存储访问。我们的实验表明，OFS通过显着减少文件访问延迟和文件访问引起的网络流量，可以有效地支持任务卸载和卸载任务的有效执行。

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