Concurrent Reading and Writing using Mobile Agents



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Sensor Network

  • The sensor network is checking the
  • structural integrity of the bridge
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Mobile robots

  • I-Swarm Robot
  • (See a video of the I-Swarm
  • Robots on YouTube)
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  • The I-Swarm project, consisting of 10 research institutes,
  • is coordinated by Professor Heinz Wörn and Jörg Seyfried
  • of the University of Karsruhe in Germany.

Goal of a distributed system

  • The computers coordinate their activities and to share hardware and software and data, so that users perceive it as a single, integrated computing service with a well-defined goal.
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  • Downloading music in Bittorrent

Goal continued

  • Distributed computing relies on inter-process communication, which involves the various layers of networking. Distributed computing helps create simple abstractions for these layers to facilitate program writing. Examples:
  • TCP implements a reliable end-to-end communication channel,
  • Media Access protocol used in Ethernet LAN or Wireless networks helps resolve network access conflict.
  • P
  • Q
  • Create a reliable channel between P and Q that are 10,000 miles away
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Why distributed systems

  • Geographic distribution of processes
  • Resource sharing (example: P2P networks, grids)
  • Computation speed up (as in a grid or cloud)
  • Fault tolerance
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Important challenges

  • Knowledge is local
  • Clocks are not synchronized
  • No globally shared address space
  • Topology and routing : everything is dynamic
  • Scalability: what is this
  • Processes and links fail:
    • Fault tolerance and system availability
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