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Public and private BitTorrent communities: A measurement study PowerPoint Presentation
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Public and private BitTorrent communities: A measurement study

Public and private BitTorrent communities: A measurement study

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Public and private BitTorrent communities: A measurement study

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  1. Public and private BitTorrent communities: A measurement study M. Meulpolder, L. D’Acunto, M. Capotă, M. Wojciechowski, J.A. Pouwelse, D.H.J. Epema, H.J. Sips TU Delft

  2. Contents BitTorrent communities Goal Experimental setup Measurement results Conclusions 2/16

  3. BitTorrent communities Content discovery web pages Communities User accounts Comments Ratings Forums Public and private 3/16

  4. Motivation and goal Private communities employ more incentives Are there differences between public and private? Download speed Connectability Seeding duration Seeder/leecher ratio Fraction of bytes from seeders 4/16

  5. 6/16

  6. Experimental setup 7/16

  7. Measurement details Time - September to December 2009 508 269 users 444 swarms Over 20 million bitfields 8/16

  8. Download speed 9/16

  9. Download speed Vs. previous results Guo, IMC 2005, public 160 kbit/s mean Pouwelse, IPTPS 2005, public 240 kbit/s mean 4 x higher overall mean 36 x higher PolishTracker mean 10/16

  10. Connectability 11/16

  11. Connectability Vs. previous results Pouwelse, IPTPS 2005 40% overall, same as today 2 x lower PolishTracker mean Mol, P2P 2008 66% for ThePirateBay 45% for TVTorrents 12/16

  12. Seeders and leechers 13/16

  13. Seeding duration 14/16

  14. Seeding duration Previous results Pouwelse, IPTPS 2005 83% < 1 h Guo, IMC 2005 8% > 1 day 15/16

  15. Source of incoming bytes 16/16

  16. Conclusions Private vs. public Speed is 3-5 times faster Percentage of unconnectable peers is 1/2 Seeder/leecher ratio is at least 10 times higher Seeding duration is much longer The tit-for-tat mechanism is much less important 17/16