A. Measurement
Several measurement-based studies of BitTorrent performance
have been presented in the literature. Most of the
measurement-based experiments lasted for several months.
Generally, the following five methods were used: (a) analyzing
the tracker logs obtained from the trackers, (b) using
scripts to gather information from torrent websites and directly
from peers, (c) analyzing packet traces collected at Internet
access link, (d) joining an ongoing torrent with a modified
client specially instrumented to collect event logs, and (e)
conducting experiments on network testbeds like PlanetLab
or user-constructed networks of PCs. Observing the tracker
log can enable us to get the information on the global view
of BitTorrent performance; whereas using a modified client
enable us to observe the individual behavior of peers.
Izal et al. [18] evaluated the performance of BitTorrent
mechanisms based on five months of measurement data
collected from BitTorrent peers. This was one of the first
comprehensive evaluation of BitTorrent using measurement.
First, they used the tracker log of Linux RedHat 9 distribution
for their evaluation. They found that:
A. MeasurementSeveral measurement-based studies of BitTorrent performancehave been presented in the literature. Most of themeasurement-based experiments lasted for several months.Generally, the following five methods were used: (a) analyzingthe tracker logs obtained from the trackers, (b) usingscripts to gather information from torrent websites and directlyfrom peers, (c) analyzing packet traces collected at Internetaccess link, (d) joining an ongoing torrent with a modifiedclient specially instrumented to collect event logs, and (e)conducting experiments on network testbeds like PlanetLabor user-constructed networks of PCs. Observing the trackerlog can enable us to get the information on the global viewof BitTorrent performance; whereas using a modified clientenable us to observe the individual behavior of peers.Izal et al. [18] evaluated the performance of BitTorrentmechanisms based on five months of measurement datacollected from BitTorrent peers. This was one of the firstcomprehensive evaluation of BitTorrent using measurement.First, they used the tracker log of Linux RedHat 9 distributionfor their evaluation. They found that:
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