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Greg Burri, 07/09/2009 10:33 AM
Protocols¶
This page describes the protocols used by Aybabtu for network communication between cores and between core and GUI.
Core <-> Core¶
Notes pour plus tards¶
- Le message HaveChunks doit être multicast et la réponse est un datagramme UDP. Il n'est pas possible de maintenir N-1 connexion TCP en permanence ou N est le nombre de peer. (à mesurer). DU coup ce message peut remplacer le IMAlive
See source:protos/network_protocol.proto for message details.
There is no more than one downloading from B to A. A peer which a download is active is setted as not free.
There is NbDownloadThread thread T. Each thread will choose a free chunk and download it. Here is the thread loop.
take the first file not finished -> f for each chunk not download or not being downloaded takes the best one : c has a free peer -> p and p.downloadRate is the best. If there is some equals chunk, T will choose randomly among theses. If there is no free chunk then go to the next file. If the hash chunks of a file are unknown then the hashes are asked to the source, see the message _GetHashes _.
Parameters¶
Most parameters will be stored as constants in their component.
Name | Value | Unit | Explanation/Comments |
---|---|---|---|
IMAliveFrequency | 0.1 | [Hz] | The message IMAlive is sent each 10s. |
ChunkSize | 33554432 | [Byte] | (32 MB) |
LanSpeed | 52428800 | [Byte/s] | (50 MB/s) |
TimeRecheckChunkFactor | 4 | - | If the time to download a chunk exceeds TimeRecheckChunkFactor * ChunkSize / LanSpeed the peers are rescanned to choose a better one (better download rate). For example : 4 * 32 / 50 = 2.6 second |
SwitchToAnotherPeerFactor | 1.5 | - | During the recheck of the peers to choose a better one the other download rate must be above the current * 1.5. |
DownloadRateValidTime | 1500 / LanSpeed = 300 s | [s] | (5 min). The download rate of a peer is only valid during this time after its last update. After that its rate is set to the maximum. |
TimeBetweenChunksUpdate | 500 / LanSpeed = 10 s | [s] | Each 10 s a daemon will scan the NumberOfChunkToUpdate first chunks from the first queued downloads to know which peer has which chunk. |
NumberOfChunkToUpdate | 100 * LanSpeed / ChunkSize = 156 | - | The first 156 hash chunks (3 kB) will by send periodically to each peer. See message HaveChunks in the proto file. |
FindTimeout | 15 | [s] | A search request is abandoned after 15 seconds from the start of the request. See message Find. |
GetHashesTimeout | 200 | [s] | Timeout for the message GetHashes. |
GetChunkTimeout | 10 | [s] | Timeout for the message GetChunk. |
HaveChunksTimeout | TimeBetweenChunksUpdate = 10 | [s] | Timeout for the message HaveChunks. |
GetEntriesTimeout | 10 | [s] | Timeout for the message GetEntries. |
NbDownloadThread | 3 | - | Number of concurrent downloading thread. |
Core <-> GUI¶
Updated by Greg Burri over 15 years ago · 25 revisions