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Re: Are gzip-compressed substitutes still used?

From: Jonathan Brielmaier
Subject: Re: Are gzip-compressed substitutes still used?
Date: Wed, 17 Mar 2021 19:20:07 +0100
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:78.0) Gecko/20100101 Icedove/78.7.1

On 17.03.21 18:12, Ludovic Courtès wrote:
for the initial message.)

Here’s an update, 1.5 month later.  This time I’m looking at nginx logs
covering Feb 8th to Mar 17th and using a laxer regexp than in the
message above, here are the gzip/lzip download ratio for several

--8<---------------cut here---------------start------------->8---
ludo@berlin ~$ ./ /tmp/sample3.log                         
                                       gtk%2B-3: gzip/lzip ratio: 37/3255 1%
glib-2: gzip/lzip ratio: 97/8629 1%
coreutils-8: gzip/lzip ratio: 81/2306 3%
python-3: gzip/lzip ratio: 120/7177 1%
r-minimal-[34]: gzip/lzip ratio: 8/302 2%
openmpi-4: gzip/lzip ratio: 19/236 8%
hwloc-2: gzip/lzip ratio: 10/43 23%
gfortran-7: gzip/lzip ratio: 6/225 2%
--8<---------------cut here---------------end--------------->8---

Interesting findings...

Conclusion?  It still sounds like we can’t reasonably remove gzip
support just yet.

I’d still like to start providing zstd-compressed substitutes though.
So I think what we can do is:

   • start providing zstd substitutes on berlin right now so that when
     1.2.1 comes out, at least some substitutes are available as zstd;

   • when 1.2.1 is announced, announce that gzip substitutes may be
     removed in the future and invite users to upgrade;

My personal substitution servers runs with lzip + zstd, so no gzip. It
works fine, but I didn't had any "legacy" users. Although zstd is only
0,6% of lzip in regards to total downloads over the last months...

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