From: Leo Famulari <leo@famulari.name>
To: "Ludovic Courtès" <ludo@gnu.org>
Cc: guix-devel@gnu.org
Subject: Re: Parallel downloads
Date: Tue, 12 Nov 2019 12:44:42 -0500 [thread overview]
Message-ID: <20191112174442.GA25397@jasmine.lan> (raw)
In-Reply-To: <87h83d7xsn.fsf@gnu.org>
On Sat, Nov 09, 2019 at 06:40:56PM +0100, Ludovic Courtès wrote:
> Like I wrote, it’s not that simple (we’d first need the daemon to
> distinguish substitution jobs from other jobs, but note that there are
> also “downloads” that are actually derivation builds), and it’s not
> clear to me that it’s overall beneficial anyway: it’s not supposed to be
> faster to download 10 things in parallel from ci.guix.gnu.org, than to
> download them sequentially.
Parallel downloading is not faster in terms of overall transfer rate
from ci.guix.gnu.org.
However, installing things with Guix involves downloading a lot of very
small files like derivations, and Guix spends a lot of time initiating
these downloads.
For example, I can download things at 100 megabits, but when Guix needs
to sequentially download 50 10-kilobyte files, it may take an entire
minute.
So there is a huge speedup with parallel downloading.
next prev parent reply other threads:[~2019-11-12 17:45 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-31 15:07 Parallel downloads Pierre Neidhardt
2019-10-31 16:18 ` Tobias Geerinckx-Rice
2019-10-31 16:48 ` Pierre Neidhardt
2019-10-31 18:01 ` zimoun
2019-10-31 18:09 ` Pierre Neidhardt
2019-11-03 14:48 ` Ludovic Courtès
2019-11-03 15:29 ` Pierre Neidhardt
2019-11-06 15:34 ` Ludovic Courtès
2019-11-06 16:08 ` Pierre Neidhardt
2019-11-09 17:40 ` Ludovic Courtès
2019-11-10 13:28 ` Pierre Neidhardt
2019-11-12 15:36 ` Ludovic Courtès
2019-11-12 15:59 ` John Soo
2019-11-12 16:48 ` zimoun
2019-11-13 7:43 ` Efraim Flashner
2019-11-13 11:26 ` zimoun
2019-11-12 17:44 ` Leo Famulari [this message]
2019-11-17 17:15 ` Ludovic Courtès
2019-11-13 16:16 ` Mark H Weaver
2019-11-13 18:03 ` Pierre Neidhardt
2019-11-13 18:25 ` Leo Famulari
2019-11-13 19:34 ` Pierre Neidhardt
2019-12-13 9:35 ` Pierre Neidhardt
2019-12-13 12:25 ` Brett Gilio
2019-11-17 17:52 ` Ludovic Courtès
2019-11-06 21:26 ` Bengt Richter
2019-11-01 10:06 ` Joshua Branson
2019-11-01 19:11 ` Pierre Neidhardt
2019-11-03 14:50 ` Ludovic Courtès
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