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rewrote the piece picker to be more cpu and memory efficient. replaces the concept of sequential-download-threshold with just a sequential download settings

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Arvid Norberg
2008-01-31 17:52:29 +00:00
parent 3562c3e646
commit c798ab30e1
11 changed files with 822 additions and 656 deletions
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22
docs/manual.rst
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@@ -1427,7 +1427,7 @@ Its declaration looks like this::
int upload_limit() const;
void set_download_limit(int limit) const;
int download_limit() const;
void set_sequenced_download_threshold(int threshold) const;
void set_sequential_download(bool sd) const;
void set_peer_upload_limit(asio::ip::tcp::endpoint ip, int limit) const;
void set_peer_download_limit(asio::ip::tcp::endpoint ip, int limit) const;
@@ -1658,24 +1658,18 @@ limit.
download, respectively.
set_sequenced_download_threshold()
----------------------------------
set_sequential_download()
-------------------------
::
void set_sequenced_download_threshold(int threshold);
void set_sequential_download(bool sd);
sequenced-download threshold is the limit on how popular a piece has to be
(popular == inverse of rarity) to be downloaded in sequence instead of in
random (rarest first) order. It can be used to tweak disk performance in
settings where the random download property is less necessary. For example, if
the threshold is 10, all pieces which 10 or more peers have, will be downloaded
in index order. This setting defaults to 100, which means that it is disabled
in practice.
Enables or disables *sequential download*. When enabled, the piece picker will pick pieces in sequence
instead of rarest first.
Setting this threshold to a very small value will affect the piece distribution
negatively in the swarm. It should basically only be used in situations where
the random seeks on the disk is the download bottleneck.
Enabling sequential download will affect the piece distribution negatively in the swarm. It should be
used sparingly.
set_peer_upload_limit() set_peer_download_limit()