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made piece picker less anal about speed categories, to improve performance

This commit is contained in:
Marcos Pinto 2007-07-06 01:44:16 +00:00
parent 83c9b2f275
commit f9bfd9c6cb
1 changed files with 23 additions and 10 deletions
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33
libtorrent/src/piece_picker.cpp
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@ -1071,21 +1071,31 @@ namespace libtorrent
namespace
{
bool exclusively_requested_from(piece_picker::downloading_piece const& p
// the first bool is true if this is the only peer that has requested and downloaded
// blocks from this piece.
// the second bool is true if this is the only active peer that is requesting
// and downloading blocks from this piece. Active means having a connection.
boost::tuple<bool, bool> requested_from(piece_picker::downloading_piece const& p
, int num_blocks_in_piece, void* peer)
{
bool exclusive = true;
bool exclusive_active = true;
for (int j = 0; j < num_blocks_in_piece; ++j)
{
piece_picker::block_info const& info = p.info[j];
if (info.state != piece_picker::block_info::state_none
&& info.peer != peer
&& info.peer != 0
&& static_cast<policy::peer*>(info.peer)->connection)
&& info.peer != peer)
{
return false;
exclusive = false;
if (info.peer == 0
|| static_cast<policy::peer*>(info.peer)->connection == 0)
{
exclusive_active = false;
return boost::make_tuple(exclusive, exclusive_active);
}
}
return true;
}
return boost::make_tuple(exclusive, exclusive_active);
}
}
@ -1120,8 +1130,10 @@ namespace libtorrent
// is true if all the other pieces that are currently
// requested from this piece are from the same
// peer as 'peer'.
bool only_same_peer = exclusively_requested_from(*p
, num_blocks_in_piece, peer);
bool exclusive;
bool exclusive_active;
boost::tie(exclusive, exclusive_active)
= requested_from(*p, num_blocks_in_piece, peer);
// this means that this partial piece has
// been downloaded/requested partially from
@ -1130,7 +1142,7 @@ namespace libtorrent
// blocks to the backup list. If the prioritized
// blocks aren't enough, blocks from this list
// will be picked.
if (prefer_whole_pieces && !only_same_peer)
if (prefer_whole_pieces && !exclusive)
{
if (int(backup_blocks.size()) >= num_blocks) continue;
for (int j = 0; j < num_blocks_in_piece; ++j)
@ -1164,7 +1176,7 @@ namespace libtorrent
// if the state of the piece is none (the
// piece will in that case change state).
if (p->state != none && p->state != speed
&& !only_same_peer
&& !exclusive_active
&& !ignore_speed_categories)
{
if (int(backup_blocks.size()) >= num_blocks) continue;
@ -1547,3 +1559,4 @@ namespace libtorrent
}