ns-3 tutorial

Description

Improving Simulation CredibilityThrough Open Source SimulationsTom HendersonUniversity of WashingtonThe Boeing CompanySimutools ConferenceMarch, 2008 Simutools March 2008 1Talk outline• A decade of ns-2 network simulations• ns challenges and directions– ns-3 project overview– Dealing with simulation credibility issues Simutools March 2008 2What is ns (or ns-2)?• ns is a discrete-event network simulator for Internet systems– protocol design, prototyping, multiple levels of abstraction• ns has a companion network animator called nam– hence, has been called the nsnam project Simutools March 2008 3Some ns-2 history• Dedicated project funding on the simulator itself finished in 2000– Key institutions: USC ISI, Berkeley, LBNL, ICIR, PARC, and others Simutools March 2008 4ns-2 Impactns is a research community resourceSource: Search of ACM Digital Library papers citing simulation, 2001-04• Other statistics:– Over 50% of ACM and IEEE network simulation papers from 2000-2004 cite the usen so-2f • Source: ACM Digital Library and IEEExplore searches– 10 Simutools 2008 papers/posters related to ns-2 Simutools March 2008 5Still in heavy use...• over 8000 downloads/month (ns-2 plus ns-allinone), active mailing listsns-allinone and ns-2 downloads1100010000900080007000600050004000300020001000004-0705-0706-0707-0708-07 09-0710-0711-0712-0701-0802-08Statistics: SourceForge project site (http://sourceforge.net/projects/nsnam/) ...

Informations

• Publié par: Phoun
• Nombre de lectures: 19
• Langue: English

Extrait

 

Improving Simulation Credibility Through Open Source Simulations

Tom Henderson University of Washington The Boeing Company

Simutools Conference March, 2008

Simutools March 2008

1

Talk outline

• •

 

A decade of ns-2 network simulations

nschallenges and directions – ns-3  project overview – Dealing  with simulatio

Dealing with simulation credibility issues

Simutools March 2008

2

What isns (or ns-2)?

 

•

•

nsis a discrete-event network simulator for Internet systems – protocol  design, prototyping, multiple levels of abstraction

nshas a companion network animator callednam – hence,  has been called

thensnamproject

Simutools March 2008

•

Some ns-2 history

 

Dedicated project funding on the simulator itself finished in 2000 –

Key institutions: USC ISI, Berkeley, LBNL, ICIR, PARC, and others

Simutools March 2008

4

ns-2 Impact

 

nsis a research community resource

Source: Search of ACM Digital Library papers citing simulation, 2001-04 • Other  statistics: – Over 50%  of ACM and IEEE network simulation papers from 2000-2004 cite the use ofns-2 • Source: ACM  Digital Library and IEEExplore searches

– 10  Simutools 2008 papers/posters related to ns-2

Simutools March 2008

5

Still in heavy use...

•

over 8000 downloads/month (ns-2 plus ns- allinone), active mailing lists

ns-allinone and ns-2 downloads

11000 10000 9000 8000 7000 6000 5000 4000 3000 2000 1000 0 04-07 05-07 06-07 07-07 08-07 09-07 10-07 11-07 12-07 01-08 02-08

Statistics: SourceForge project site (http://sourceforge.net/projects/nsnam/)

 

Simutools March 2008

6

ns-2 contributed code

 

•

where most ns-2 development now occurs

7

Skepticism abounds, however

 

“For years, the community had to rely on simulators, which now seem a little dated, and it’s not clear who was convinced to adopt anything new based on ns2 simulations;”   

Nick McKeown, VINI public review, ACM Sigcomm 2006

Simutools March 2008

8

Overheard* on e2e-interest mailing list

“...Tragedy of the Commons...”

“ .around 50% of the papers appeared to be... .. bogus...”

“Who has ever validated NS2 code?”

“To be honest, I'm still not sure whether I will use a simulation in a paper.”

“ .I will have a hard time accepting or advocating .. the use of NS-2 or any other simulation tool”

...

mail    2005 archives of* September S t i h m e u   t e o 2 ol e s -   i M nt ar e c r h e   s 2 t 0   08 ing list

9

Trends

 

Many researchers move away from simulations • Experiments  and testbeds (real or virtual) start to be preferred in major conference papers – PlanetLab,  OneLab, VINI, Emulab, ORBIT, WhyNet, ..

Yet simulation tools proliferate • ns-2,  OMNET++, NetSim, NCTUns, QualNet, OPNET, SSFNet, yans, GTNetS, GloMoSim, OSA, JiST/SWANS, cnet, simscript, Traffic, Shunra VE, Extend, INES, J-Sim, HEGONS, Narses, 3LS, NeuroGrid, P2PSim, PeerSim, ONE, ...

Simutools March 2008

10

Challenges for ns (and simulators)

 

•

•

Align with how research is now conducted

Improve credibility

Can ns-3 help with these problems?

Simutools March 2008

11