ITR: Collaborative Research: Digital Resource Profiling for Wide Area Applications

本提案将探讨影响广域应用性能和可扩展性的基本研究问题。当通过动态广域网访问时，所提出的研究对数字资源随时间和不同应用程序的访问延迟和变化行为进行了全面研究。本研究的一个目标是开发适当的延迟配置文件和资源配置文件来描述这种行为。将开发延迟配置文件来反映客户机和资源（服务器）集群所经历的端到端延迟。资源概要文件反映适当的度量，例如存在性检查、测试一段时间内的可达性，以及更新的学习模式。考虑到应用程序需求和嘈杂的WAN环境，这些配置文件将用于定制服务和信息交付给客户。相应的算法将探索端到端延迟和数据过时之间的权衡，以满足不同的应用程序需求。研究结果将旨在建立一个一致的分析框架，并回答以下问题：在何种程度上可以使用分析来改善客户对资源的可用性。理论研究的正式结果将在大规模应用中进行评估。与国家研究计划公司（CNRI）合作，Handle协议开发人员将提供大规模的测试平台

This proposal will explore fundamental research issues that impact performance and scalability of Wide Area Applications. The proposed research undertakes a comprehensive study of the access latencies and changing behavior of digital resources over time and across different applications, when accessed via the dynamic WAN. One objective of this research is to develop appropriate latency profiles and resource profiles to characterize this behavior. Latency profiles will be developed to reflect the end-to-end delay experienced by a cluster of clients and resources (servers). Resource profiles reflect appropriate metrics, such as existence checking, testing reachability over time, and learning patterns of updates. These profiles will be used to customize service and information delivery to clients, considering both application requirements and the noisy WAN environment. The corresponding algorithms will explore the trade-offs between end-to-end latency and data obsolescence for different application requirements. Research results will aim to establish a consistent framework for profiling and to answer the following question: to what extent can profiling be used in improving clients' availability to resources. Formal results developed in the theoretical study will be evaluated on large scale applications. Collaboration with Corporation for National Research Initiative (CNRI) Handle protocol developers will provide a test-bed for large scale