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anti-leach seeding unchoke mode

This commit is contained in:
Arvid Norberg 2010-10-21 05:53:13 +00:00
parent 9b50acbe15
commit cadd4f1b8d
3 changed files with 38 additions and 2 deletions
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7
docs/manual.rst
View File

@ -3750,7 +3750,8 @@ session_settings
enum seed_choking_algorithm_t
{
round_robin,
fastest_upload
fastest_upload,
anti_leech
};
int seed_choking_algorithm;
@ -4116,6 +4117,10 @@ options are:
* ``fastest_upload`` unchokes the peers we can send to the fastest. This might be
a bit more reliable in utilizing all available capacity.
* ``anti_leech`` prioritizes peers who have just started or are just about to finish
the download. The intention is to force peers in the middle of the download to
trade with each other.
``use_parole_mode`` specifies if parole mode should be used. Parole mode means
that peers that participate in pieces that fail the hash check are put in a mode
where they are only allowed to download whole pieces. If the whole piece a peer

3
include/libtorrent/session_settings.hpp
View File

@ -467,7 +467,8 @@ namespace libtorrent
enum seed_choking_algorithm_t
{
round_robin,
fastest_upload
fastest_upload,
anti_leech
};
// the choking algorithm to use for seeding torrents

30
src/peer_connection.cpp
View File

@ -422,6 +422,36 @@ namespace libtorrent
if (c1 > c2) return true;
if (c2 > c1) return false;
}
else if (m_ses.settings().seed_choking_algorithm == session_settings::anti_leech)
{
// the anti-leech seeding algorithm ranks peers based on how many pieces
// they have, prefering to unchoke peers that just started and peers that
// are close to completing. Like this:
// ^
// | \ / |
// | \ / |
// | \ / |
// s | \ / |
// c | \ / |
// o | \ / |
// r | \ / |
// e | \ / |
// | \ / |
// | \ / |
// | \ / |
// | \ / |
// | V |
// +---------------------------+
// 0% num have pieces 100%
int t1_total = t1->torrent_file().num_pieces();
int t2_total = t2->torrent_file().num_pieces();
int score1 = (num_have_pieces() < t1_total / 2
? t1_total - num_have_pieces() : num_have_pieces()) * 1000 / t1_total;
int score2 = (rhs.num_have_pieces() < t2_total / 2
? t2_total - rhs.num_have_pieces() : rhs.num_have_pieces()) * 1000 / t2_total;
if (score1 > score2) return true;
if (score2 > score1) return false;
}
// if both peers are still in their send quota or not in their send quota
// prioritize the one that has waited the longest to be unchoked