Availibility % < Downloaded % possible ?

[pstein]

Ok, I started a (big) torrent download with approx 600 MB size

When I open now the "General" tab there is a "Downloaded" and a "Availability" bar.

Much to my surprise the "Availablity" bar shows with a percentage of 36% lots of gaps

while the "downloaded" goes straight from 0% -> 100% during the 2 hours of download.

Hmm, whats that? Shouldn't "Availablility" show 100% since the download is completely possible without problems in one step ?

What sense makes the "Availibility" bar otherwise ?

If it is an "Update" problem: Can I force the "Availability" bar to be updated completely?

[DreadWingKnight]

Rounding is different.

Availability is calculated based on the bitfield.

What color are the gaps?

[Lord Alderaan]

I'm pretty sure availability doesn't include seeds and is therefore only really relevant if there are no seeds. [edit]<=- WRONG![/edit]

It shows how much of the whole file is available over all the peers. Even with seeds present availability can be an interesting stat cos it shows how good the torrent is actually spread around (which could increase speeds).

[Ultima]

It includes anyone you're connected to.

[olmari]

To make sure pstein grabs the idea behind here: avaibility is measured so that 1 is one complete torrent available across clients, 0.5 means half, say 25 means that whole torrent is available 25 times from unique clients.

[DreadWingKnight]

I'm pretty sure availability doesn't include seeds and is therefore only really relevant if there are no seeds.

Availability counts ALL peers and seeds you're connected to.

Each seed counts as 1 for availability.

[pstein]

Hmm, so assume a download consists of 4 chunks: 1 2 3 4

There are only 2 peers: A and B which hold the following chunks:

A: 1 + 2

B: 2 + 3

What is the Availability now? 0.5 or 0.75 + 1 ?

[DreadWingKnight]

The availability between A and B is 0.75

Availability totals also include your own pieces, so if you aren't A or B and you have only piece 4, the availability is 1.25.

[DiLLiGaS]

imo... availability is an average off all peers (leechers and seeders)..

(seeders.100% + leechers.n%) / (leechers + seeders) = available%

whereas your download is just yours.. 100% (or less if you havent finished it)

goon is the way of the future

....big torrent (~600mb)? 4gig is a big torrent.. 600mb is average.

[DreadWingKnight]

No it's not an average.

It's calculated based on the have bitmaps for you and the peers you're connected to.

[DiLLiGaS]

DreadWingKnight:

elaborate for all, please?

wtf is "It's calculated based on the have bitmaps for you and the peers" ? well????

[DreadWingKnight]

Each piece is counted as it is seen in the connected peers.

Until there is 1 copy of EVERY piece, the availability does not increment.

Each connected seed causes the availability to increment one.

Each complete set of pieces among peers (counting each time the piece has been seen once) causes the availability to increment one.

After that it's the percentage of pieces that are available.

[Ultima]

imo... availability is an average off all peers (leechers and seeders)..

How do you compare an opinion to an informed fact? If you're not familiar with BitTorrent, you should not be challenging DWK.