1. ENERGY EFFICIANT BIT TORRENT
NETWORKS
SHARJEEL AFRIDI

2. AGENDA
 Introduction
 BitTorrent
 Energy Efficient BitTorrent
 MILP Model for Energy Efficient BitTorrent
 Results
 Future Work

3. Introduction
 Energy Consumption of ICT networks.
 Two Content Distribution Networks
◦ Client-Server
◦ Peer-to-Peer
 IP Over WDM Networks
◦ IP layer
◦ Optical Layer

4. BitTorrent
 Peer-to-Peer file sharing protocol
 Used to distribute large amount of files
 Accounts for approximately 20% of internet traffic
 Why BitTorrent?
 Bram cohen
 BitTorrent Terminologies
◦ Torrent, Client, Peer, Tracker, Seeder, Leecher, Swarm

5. File sharing Strategies of Peers
 Random first piece
 Rarest First
 Endgame mode
 Choking/Unchoking
 Optimistic Unchoking

6. Energy Efficient BitTorrent
 Energy Efficient BitTorrent
we use number of methods to reduce Cross ISP traffic
◦ Bandwidth Throttling
◦ Use of Cache
◦ Gateway peer
NSFNET Network
◦ Locality
 We consider 160,000 groups of downloader distributed randomly over the
NSFNET network nodes.
 Homogenous system where all peers have same upload capacity of 1 Mbps
 Tit for Tat ensures fairness among peers

7. MILP Model
 Objective. Maximize
 Subject To:
Download rate for leecher to its download capacity
Download rate in accordance with upload capacity
Peer Upload rate would not exceed peer upload capacity
Fairness Constraints, Tit-for-Tat
Time phase for each swarm to dowmload a different file

8. Results
Seeders Energy
15 2.3 %
20 2.7 %
25 3.2 %
30 3.1 %
35 4.0 %
40 4.7 %
45 5.4 %
50 6.5 %
55 7.6 %
60 9.24 %
65 10.6 %
70 12.13 %
75 13.6 %
80 15.5 %
85 17. 6 %
File Sizes with Different Number of Swarms (Uniform and Gaussian Distribution)

9. Results
Seeders Energy
15 9.6 %
20 18.3 %
25 28.2 %
30 39.4 %
35 52 %
40 66 %
45 82 %
Different Peer Sizes with Fix Number of Swarms

10. Results
Seeders Energy
15 49.7 %
20 49.4 %
25 49 %
30 48.5 %
35 47 %
40 42.7 %
45 32.6 %
Consumption With Different Swarms Sizes with Peer Sizes

11. Future Direction
This project can be extended up to an energy efficient BitTorrent for Hybrid
kind of network, which is the combination of client-server and peer-to-peer
network. In such systems, BitTorrent can assist a CDN (content delivery
networks) to distribute its contents to the end users if the content is popular,
leading to exerting less load on the CDN. Studying file sizes, popularity and
peers distribution among swarms in such systems can assist in
understanding the energy gains that can be achieved in the hybrid systems
by understanding the best time and network location in which the delivery
task is switched from CDN to P2P.