Sepideh Jamshidi-Nejad - Ph.D. candidate, Islamic Azad University Rasht;
Peyman Bayat - Faculty, Islamic Azad University of Rasht;
Mohsen Vaez-Ghasemi - Faculty, Islamic Azad University of Rasht;

The main challenge in file service provider systems is to reduce waiting and response time. Along with reducing service time, achieving goals such as reducing pressure on the based server and reducing bandwidth consumption are also important in these systems. In this study, game theory in bit-torrentsharing protocols was used to overcome the challenge and achieve the stated goals. As the most important result, it has been proved that game theory can be mapped to the Bit Torrent protocol. After mapping, the downloaded file was introduced as the game and the file requesters were introduced as the players. Then a topological tree was created based on the Bit Torrent protocol, and the vector N of the game that was matched by the access to the search file based on the tree's optimal path, was achieved. With final scoring,the payment function indicating the players' win lose or draws,was determined and the results were analyzed in four stages. First, the possibility of finishing the game at each stage was determined. Then the results of the game were analyzed. In the third stage, each player was watched alone and evaluated in the fourth stage of the game.

Game theory, Bit Torrent Protocol, Extension on bit torrent protocol, Distributed system