[bittorrent] 'Rarest first' question.

Bruno Hertz brrhtz at yahoo.de
Thu Jun 29 08:17:04 EDT 2006

"Bruno Hertz" <brrhtz at yahoo.de> writes:

> Elliott Mitchell <ehem at m5p.com> writes:
>>>From: Bruno Hertz <brrhtz at yahoo.de>
>>> Well, I'd say too BT suggests rarest first, and I also see
>>> why. Problem is there is no written spec apart from 1.0, which
>>> suggests random selection. If you know of any other formal, written
>>> specification, apart from the mainline source code, please let me
>>> know.
>> Suggests rarest first for pieces below a threshold of commonness, then
>> random above that threshold.
> Sure. I took knowledge of the algo's details, like the startup and
> endgame phase, for granted.

Sorry, I misunderstood that. Thought you referred to the four pieces
picked at random during startup.

Can anybody confirm this? I.e. does mainline implement an algorithm
where rarest first is only applied for pieces with availability below
a given threshold?

Regards, Bruno.


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