Transcript Visualisation and Analysis of Real Time Application Behaviour in a

Visualisation and Analysis of
Real Time Application
Behaviour in a Simulated
Network
(!Temporal Databases  K. Maciunas)
Evan Bourlotos
Supervisors Cheryl Pope, Kevin Maciunas
Overview
 Motivation
 The Network Simulator - REAL
 Real Time Applications (Streaming Media)
 Integration of Simulator and Emulator
 Project Tasks
 Project Goals
Motivation
• Demand for real time applications is increasing
• Network simulation is the most efficient means of
developing and testing new protocols and network
schemes
• Evaluation of the behaviour of real time
applications would benefit from an ability to
assess the “quality of reproduction” when
subjected to a particular network scheme
The Network Simulator - REAL
 Developed at Cornell University (WHEN???)
 Originally intended for studying the dynamic
behaviour of flow and congestion control schemes
in packet-switched data networks.
 It provides a way of specifying networks and to
simulate their behavior.
The Network Simulator - REAL
 Scenario is developed which is supplied to the
simulator, it is composed of :
 description of network topology,
 protocols (IP)
 packet arrival times (workload )
 control parameters (eg bandwidth).
Network Scheme
• Network schemes look like:
Node A
Node B
Node k-1
Node k
Packets are generated at Node A destined for Node k
They travel through a number of intermediate nodes before arriving at
Node k
As a packet arrives at each node it is queued and then forwarded on
Additional network traffic is also occuring (cross-traffic/congestion)
between other nodes within the scheme.
Real Time Applications
(Streaming)
• Deliver/Require a service within a specified time
frame
– Multimedia streaming is a Real Time Application
• Source transmits a sequence of packets to a
destination at a constant rate (isochronous)
• Destination receives the packets, following a brief
delay begins playing the packets, while
continuously receiving new ones.
Integration of Simulator and
Emulator
Project Tasks
• Modify REAL
– new Streaming Media Source
– new Streaming Media Sink
• Develop Analyser
– extract information about media file
• Develop Emulator
– apply simulation results to media file
• Analysis of Results
Project Goals
• Provide a tool to visualise the effects of network
behaviour on a streaming media application
• Make it Extensible
• Make it Portable
Questions?