[bittorrent] 'Rarest first' question.

Arnaud Legout Arnaud.Legout at sophia.inria.fr
Mon Jul 3 04:59:55 EDT 2006


Bruno Hertz wrote:
> Arnaud Legout <Arnaud.Legout at sophia.inria.fr> writes:
>> you are right. I just had a look at 
>> http://wiki.theory.org/BitTorrentSpecification
>> and found that indeed, they recommend random, and rarest first as a good 
>> practice
>> I do not remember this paragraph and I wonder whether it was modified.
I checked my old paper version of this document, and it was not modified 
as I incorrectly supposed.
>> This is clearly a bad recommendation. My guess is that they based this 
>> specification
>> on the earliest versions of BT that implemented random piece selection. 
>> This policy changed in 3.x
>> if I remember correctly. I suppose that this recommendation on random 
>> piece selection was never removed.
>> It ought to be removed.
> Well, I was thinking of http://www.bittorrent.org/protocol.html
> either. An updated version seems to be announced though.
This version was the basis of the wiki.theory spec. The description of 
this page is outdated.
> OK, here you go. The plots I find hard to read are those with dotted
> and dashed lines:
> Fig. 1.  Entropy characterization
> Fig. 2.  Evolution of the number of copies of pieces, torrent 8
> Fig. 4.  Evolution of the number of copies of pieces, torrent 7
> Fig. 7.  CDF of the piece interarrival time for torrent 10
> Fig. 8.  CDF of the block interarrival time for torrent 10
> Fig. 10. Correlation number of unchokes / interested time.
> Many thanks in advance for the effort.
sent personally as it is not of interest to the mailing list.


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