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Re: [Bug-wget] Wget wall clock time is very high

From: Dale R. Worley
Subject: Re: [Bug-wget] Wget wall clock time is very high
Date: Wed, 14 Dec 2016 09:31:52 -0500

Debopam Bhattacherjee <address@hidden> writes:
> I try to download a webpage along with it dependencies using the following
> command:
> ...
> The total download time is 1.4 seconds while the wall clock time is 6.8
> seconds which is much higher. Chrome, in comparison downloads and renders
> everythin in 2-3 seconds.
> Why is the wall clock time so high and how can it be reduced?

I can think of three reasons.  1) Chrome might have some of the
dependencies in its cache and doesn't have to download them now.  2)
Chrome probably has more than one TCP connection open to
www.standford.edu, and so is fetching files in parallel.  3)
www.stanford.edu has IPv6 addresses as well as an IPv4 address.
Browsers impelemnt the "Happy Eyeballs" algorithm (RFC 6555), which
gives better performance if IPv6 connectivity to the server is poor.


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