Protocol core-core Version 3 » History » Revision 17

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Greg Burri, 07/07/2009 11:44 PM

Protocols¶

This page describes the protocols used by Aybabtu for network communication between cores and between core and GUI.

Most parameters will be stored as constants in their component.

Name	Value	Unit	Explanation/Comments
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 chunks (3 kB) will by send periodically to each peer.

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