* andre999 ([email protected]) wrote: > Romain d'Alverny a écrit : >> >> On Wed, Jan 12, 2011 at 04:29, Michael Scherer<[email protected]> wrote: >> >> However, if 1) was to open 5 connections on 5 distinct servers, that >> would make more sense, no? > > Right. > Another way to look at the question : > If 1000 people are downloading from mirrors allowing a total of 2000 > connexions, if no-one uses multiple connexions, then 1000 connexions are > wasted. These unused connexions would likely be from faster mirrors.
The upload given by a serveur is split in term of: - connection available - bandwidth available. If the mirrors is connected to Gb (which is more likelly the size of bandwidth for the whole university...), and you split this Gb/s onto 2000 connection you obtain 500kb/s. However, I know only few server in the world really able to read Gb/s from their disk. The top rate I obtain on dc is 400mbis/s (the memory cache help a lot to obtain more). The number of connection is set high because some people download at only 50kb/s and other 2Mbit/s, so the spare bandwidth from the 50kb/s can be given to others. Nothing more. According the graph on distrib-coffee: http://distrib-coffee.ipsl.jussieu.fr/munin/distrib-coffee/distrib-coffee/index.html there is an average of 100 http download at a time, if each connection become 5 (500), you'll reach the limit (200 on this server). What will be the gain on your side ? I talked here only about http, but apply the same to ftp in the same internet connection, so it mean I have 100mbits/s to share between 400 connections. As Mickael explain, I voluntary limit the count of connection per IP, before I did this, the server was overload 12 hour a day, which mean stop serving ! > With aria2c, 3 mirrors which support a total of 5 connexions gives me > optimal speed. (The limit being the speed of my computer.) Can we know the speed of your connection ? Maybe your connection is good enough to provide a mirror for Mageia ? And then you'll be able to test what you're suggesting. What is the result with 5 mirrors and 1 connection per mirror ? Obviously, any mirror in France (I am in France) is able to fulfill my personnal connection... (10mbits/s). -- Olivier Thauvin CNRS - LATMOS ♖ ♘ ♗ ♕ ♔ ♗ ♘ ♖
pgpMqejuntQRN.pgp
Description: PGP signature
