The top 20 trackers are depicted in the bar chart below:ĭataset: 283,031 swarms, total of 52,634,778 peers. Swarm sizes were constantly updated during this time. torrent files of these swarms were obtained by running the Tribler TorrentCollecting software for roughly a year. This was done by summing up the swarm sizes of all torrents in which a tracker was mentioned in the announce fields. For each tracker we computed the number of total peers that it tracks. Large measurements show that The Pirate Bay is the most dominant central tracker. This is in line with the results of the "Understanding Churn in Peer-to-Peer Networks" paper, where the authors found the uptime of a peer to be a good indicator of the peer's remaining uptime. Also, while less peers get sent an online check, there is an increasing trend of connectability. Peers seem to be less likely connectable after they have closed the connection. If we crawl the swarm while trying to stay connected to PEX-capable peers until the connection is dropped by the other party, the graph looks quite different (see below). Note that the big drop at the end can be explained through the lack of data points: only 203 of the 475 initial peers have been checked for their online status. The graphs below show the bandwidth usage during the crawl, the number of the peers actually PEXed, statistics about the first PEX message, and the likelihood of reconnecting to a previously known peer in the future.īelow is a graph showing the number of peers still connectable after we've last seen them. Popular torrent, reportedly 2897 seeders and 826 downloaders, on, from 10:36 to 11:38. Reduced tracker fallback rate, new bandwidth/storage requirements Measuring and understanding PEX (or prev. Are seeders-only swarms breaking our algorithms? Seeders have no established connections without leechers.Determine relation with swarm age (1hour old vs.check online status and connectability of discovered peers for 1 week (drop if 10x connection unsuccessful).Some peers were heard about multiple times.Crawl several swarms for 1? hour, collect 10000 peers.Experiment around churn rate and decay of PEX info.TRACKER_PEERS_INJECTED, announce-url, #reported-seeds, #reported-downloaders, peer-IP, peer-port.Also included, but currently only relevant for human readers:.ONLINE_CHECK_TIMEOUT (connection never accepted: offline or busy).EXTEND_RECEIVED, ut_pex=1 (msg#), Transmission 1.34 (client version).CONNECTION_LOST (in case of network error), bytes-downloaded, bytes-uploaded.CONNECTION_CLOSED, bytes-downloaded, bytes-uploaded.Timestamp, SHA1, Peer-IP, peer-Port, EVENT, DATA.
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