Figure 4 presents the Cumulative Distribution Function
(CDF) for all the three protocols during input distribution. It
is clear that BitTorrent is able to distribute the same amount
of data much faster than FTP and HTTP. From Figure 5 (that
shows a zoomed region of Figure 4), we see why BitTorrent
is able to finish all the transfers earlier: as soon as one mapper
has some part of the file, it can participate in the input distribution.
Therefore, the more mappers have the input file (or at
least some parts), the faster it gets to other mappers download
the file. We do not present the CDFs for intermediate output
distributed since results are similar.