Investigation of Asynchronous Events in Non-Time-Managed Federations

Abstract

A study was developed and conducted at DRDC Atlantic to examine the relationship between (1) Wide Area Network (WAN) characteristics (i.e., latency and latency variability) and (2) High Level Architecture (HLA) federation characteristics (e.g., frequency of the occurrence of events as indexed by the frequency of the exchange of messages, event handling time and federation size) to the probability of an asynchronous event occurrence in non-time-managed federations. The study was conducted using federates sending or receiving wall-clock time-stamped HLA messages over an emulated WAN while all hardware clocks of the participating machines were synchronised. The time-stamp of each received message was examined and used in order to determine out-of-sequence arrival. Results show that in a non-time-managed federation executing over a WAN with realistic network delays, the probability of asynchronous events occurring IS significant and depends on both network characteristics and message rates.

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Document Details

Document Type
Technical Report
Publication Date
Sep 01, 2005
Accession Number
ADA511108

Entities

People

  • Dan Bleichman

Organizations

  • Defence Research and Development Canada

Tags

Communities of Interest

  • Materials and Manufacturing Processes

DTIC Thesaurus Topics

  • Classification
  • Computer Networks
  • Contracts
  • Data Rate
  • Dead Reckoning
  • Frequency
  • Global Positioning Systems
  • Intellectual Property
  • Local Area Networks
  • Network Protocols
  • Networks
  • Operating Systems
  • Probability
  • Security
  • Sequences
  • Simulations
  • Wide Area Networks

Fields of Study

  • Computer science

Readers

  • Neurotoxicology
  • Parallel and Distributed Computing.
  • Systems Analysis and Design