25 Apr
2007
25 Apr
'07
9:18 a.m.
Initiative in Innovative Computing @ Harvard
Seminar Series
Wednesday, April 25, 2007; 4:00pm
60 Oxford Street, Room 330
Srinidhi Varadarajan, Director, Center for High-End Computing
Systems, Associate Professor of Computer Science, Virginia
Polytechnic Institute and State University
Seminar Title: Relativistic Time: A Unified Temporal Model for Mixed-
Mode Simulations
Abstract
As computer networks continue to grow dramatically, there is a
critical need for scalable network simulation testbeds that can
capture the complexity of large-scale systems. To this end, we
developed the Open Network Emulator, a scalable testbed that supports
both discrete-event simulation as well as direct-code execution based
emulation of Internet-scale networks.
The scale and fidelity of this simulation environment present a
fundamental challenge. As the complexity of a simulation system
starts approaching reality, there is no unified measure of time.
Network applications in a real system run in real-time or wall-clock
time, which flows naturally, but is uncontrolled. Models of next
generation network devices operate in highly controllable virtual
time, but the virtual clock has to be forced by events occurring in
the system.
To solve this problem, we developed a system of time called
relativistic time, which reconciles real time and virtual time by
creating a model of time that flows naturally, and yet is highly
controllable.
In this talk, I will present the characteristics of the simulation
environment, the challenges in integrating temporal models and
results from our work on the relativistic time model.
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