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      Determining the Sources of Delay in a Distributed Learning Environment

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      1st LEGE-WG International Workshop on Educational Models for GRID Based Services (LEGE-WG)

      GRID Based Services

      16 September 2002

      Quality of Service, QoS, Distributed Learning Environments, DLEs, e-Learning, LeGE-WG, Open Grid Services Architecture, TAGS, web-based learning, TCP, http, Network Delay

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          Abstract

          In the context of LeGE-WG we expect to see the Open Grid Services Architecture (OGSA) being used as a guiding framework for the future deployment of Distributed Learning Environment (DLEs). OGSA is totally service-oriented and it has been known for sometime that Quality of Service (QoS) is key to the success of DLEs. Delay in particular, as experienced by the end user, is one of the key QoS parameters for a DLE. This paper describes techniques for identifying sources of such delay, and a model for its analysis. Four major sources of delay are distinguished: Server, Client, Network and Protocol. The analysis techniques are illustrated in a case study of the traffic associated with a set of operational DLEs serving six Universities over a period of several months. This paper contributes towards the use of OGSA for e-learning by providing a detailed understanding of the QoS requirements for an OGSA compliant e-learning service.

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          A psychological investigation of long retrieval times on the World Wide Web

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            An Holistic View of Quality of Service

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              Author and article information

              Contributors
              Conference
              September 2002
              September 2002
              : 1-12
              Affiliations
              School of Computer Science

              University of St Andrews

              St Andrews, KY16 9SS
              Article
              10.14236/ewic/1LeGE2002.9
              © A. Ruddle et al. Published by BCS Learning and Development Ltd. 1st LEGE-WG International Workshop on Educational Models for GRID Based Services

              This work is licensed under a Creative Commons Attribution 4.0 Unported License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/

              1st LEGE-WG International Workshop on Educational Models for GRID Based Services
              LEGE-WG
              1
              Maynooth, Ireland
              16 September 2002
              Electronic Workshops in Computing (eWiC)
              GRID Based Services
              Product
              Product Information: 1477-9358BCS Learning & Development
              Self URI (journal page): https://ewic.bcs.org/
              Categories
              Electronic Workshops in Computing

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