Re: apt PARALLELISM
On 12/13/05, Henning Makholm <firstname.lastname@example.org> wrote:
> Assume a situation where mirror bandwidth is the limiting factor, and
> imagine a world with 3 mirrors. Say that during a certain time of the
> day 600 users each minute start to download updated x.org packages.
> Either they can do their download sequentially, choosing a random
> server; then their download will be finished in 15 minutes, and each
> server has a more-or-less constant 600/3*15 = 3000 connections
> active. Alternatively each user can spread his load over all three
> servers; his download now takes 5 minutes, and each server _still_
> sees 600*5 = 3000 active connections at any time. Thus _all_ users get
That's not true. Suppose you've only got 3 users. If each user
connects to one (different) mirror, he gets 1/1 of that mirror's
bandwidth. If each user connects to each mirror, he only gets 1/3 of
that mirror's bandwidth.