l i n u x - u s e r s - g r o u p - o f - d a v i s
L U G O D
 
Next Meeting:
November 4: Social gathering
Next Installfest:
TBD
Latest News:
Oct. 24: LUGOD election season has begun!
Page last updated:
2004 Jul 26 15:32

The following is an archive of a post made to our 'vox-tech mailing list' by one of its subscribers.

Report this post as spam:

(Enter your email address)
Re: [vox-tech] bittorrent - no seeds but distributed copies increase
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [vox-tech] bittorrent - no seeds but distributed copies increase



On Mon 26 Jul 04,  2:37 PM, Samuel N. Merritt <spam@andcheese.org> said:
> On Mon, Jul 26, 2004 at 02:08:22PM -0700, Peter Jay Salzman wrote:
> > Question:
> > 
> > How does the "distributed copies" get larger when there are no seeds?
> 
> I think that "distributed copies" measures how many complete copies of
> the file you could get if you took all the pieces that everyone has and
> assembled them. 
> 
> For example, consider a five-part file.
> Alice has: 1 2 3 4
> Bob has:       3 4 5 
> Carol has: 1 2   4 
> 
> You could make one complete copy of the file from all this, so there'd
> be 1 distributed copy. If Carol got piece 5 from Bob, then you could
> assemble two complete copies. 
> 
> That's the integer part of distributed copies; I'm not sure where the
> fractional part comes from. Maybe it's the size of the largest
> distributed incomplete subfile divided by size of file, but that's just
> a shot in the dark. 
  
ok.  this was my understanding.

> > Does the tracker ever inject packets into the torrent when needed (like
> > when seeds == 0 and distributed copies < 1.0)?
> 
> No. The tracker doesn't have a local copy of the file. If there are no
> seeds and < 1 distributed copy, everyone's download will stall before
> finishing 

this was also my understanding.  but my question still stands: how does
the distributed copies increase if there are no seeds?

i'm looking at a bittorrent right now.  it's remained constant at:

   seeds: 0 seen now, plus 0.983 distributed copies
   peers: 19 seen now, 98.4% done at 0.2 kB/s

that ".983 distributed copies" has been creeping upwards.  last i looked
at it, about 15 minutes ago, it was at .97.   i've noticed this happen
before too.

how exactly does that number increase when there are no seeds?

pete

-- 
In theory, theory and practise are the same.  In practise, they aren't.
GPG Instructions: http://www.dirac.org/linux/gpg
GPG Fingerprint: B9F1 6CF3 47C4 7CD8 D33E 70A9 A3B9 1945 67EA 951D
_______________________________________________
vox-tech mailing list
vox-tech@lists.lugod.org
http://lists.lugod.org/mailman/listinfo/vox-tech



LinkedIn
LUGOD Group on LinkedIn
Sign up for LUGOD event announcements
Your email address:
facebook
LUGOD Group on Facebook
'Like' LUGOD on Facebook:

Hosting provided by:
Sunset Systems
Sunset Systems offers preconfigured Linux systems, remote system administration and custom software development.

LUGOD: Linux Users' Group of Davis
PO Box 2082, Davis, CA 95617
Contact Us

LUGOD is a 501(c)7 non-profit organization
based in Davis, California
and serving the Sacramento area.
"Linux" is a trademark of Linus Torvalds.

Sponsored in part by:
Appahost Applications
For a significant contribution towards our projector, and a generous donation to allow us to continue meeting at the Davis Library.