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                     CSGO Research Seminar
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 A Hybrid Technique for Simulating High Bandwidth-Delay 
		Product Computer Network
 
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Speaker : Dr. Peter B. Danzig
          Computer Science Department
 	  University of Southern California 
 	  danzig@usc.edu

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			Abstract
			--------
(This work is in collaboration with Jong-Suk Ahn, Deborah Estrin
and Brenda Timmerman)


This talk describes a technique for simulating high bandwidth-delay 
product computer networks that, contrasted with traditional techniques, 
lowers peak memory consumption by an order of magnitude. Decreased memory 
usage enables simulation of larger and faster networks. However, decreased 
memory consumption has its price; the performance metrics of simulations 
that employ our technique sometimes differ from the performance metrics 
that traditional simulations yield.  

We have six months experience with the technique and have applied it to 
networks carrying a combination of real-time and datagram traffic
and FIFO and Fair Queueing routers.  We intend to apply it to simulations
of network switch scheduling and admission control algorithms intended for 
multimedia networks [ClarkShenkerZhang92].

This talk motivates the need to reduce memory consumption, explores
the tradeoff between accuracy and memory savings, and describes the 
technique's packet representation scheme responsible for memory savings.  
It considers the method's applicability and argues that much of what appear 
as differences in the metrics are just illusory byproducts of small 
simulations. It addresses the objection that unabashedly introducing noise 
into a simulation makes its performance metrics untrustable.

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			Date : Tuesday 11/3/92
			Time : 10:00 a.m.
			Place: SAL 324
			Host : CSGO
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CSGO, the Computer Science Graduate Organization, 
sponsors seminars to bring together students and 
researchers in the areas of Computer Science and 
Engineering, introducing the students to the 
researchers and providing a chance for the 
researchers to get to know the students.

Some of the talks during the semester will be given 
by senior Ph.D students.

There will be one seminar every week of approximately 
one hour duration followed by a question and answer 
session. 

The seminar is at 10:00 a.m. every Tuesday morning 
in SAL 324.