[Top][All Lists]

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Re: [Bug-wget] Multi segment download

From: Random Coder
Subject: Re: [Bug-wget] Multi segment download
Date: Fri, 28 Aug 2015 15:41:27 -0700

On Fri, Aug 28, 2015 at 3:06 PM, Ander Juaristi <address@hidden> wrote:
> Hi,
> Would you point us to some potential use cases? How would a Wget user benefit 
> from such a feature? One of the best regarded feature of download managers is 
> the ability to resume paused downloads, and that's already supported by Wget. 
> Apart from that, I can't come across any other use case. But that's me, maybe 
> you have a broader overview.

One possible feature, described in flowery language from a product
description: "... splits files into several sections and downloads
them simultaneously, allowing you to use any type of connection at the
maximum available speed. With FDM download speed increases, or even

And, just show this can help, at least in some situations, here's an
example using curl (sorry, I don't know how to do a similar request in
wget).  First a normal download of the file:

curl -o all http://mirror.internode.on.net/pub/test/100meg.test

This command takes an average of 48.9 seconds to run on my current
network connection.  Now, if I split up the download as the download
manager will, and run these four commands at the same instant:

curl -o part1 -r0-25000000 http://mirror.internode.on.net/pub/test/100meg.test
curl -o part2 -r25000001-50000000
curl -o part3 -r50000001-75000000
curl -o part4 -r75000001- http://mirror.internode.on.net/pub/test/100meg.test

The union of time it takes all four commands to run ends up being an
average of 19.9 seconds over a few test runs on the same connection.
There's some penalty here because I need to spend time combining the
files afterwards, but if the command supported this logic internally,
no doubt much of that work could be done up front as the file is

reply via email to

[Prev in Thread] Current Thread [Next in Thread]